CN116398084A - Drilling grouting and plugging structure of multipoint displacement meter under complex geological conditions - Google Patents

Abstract

The application discloses multiple spot displacement meter drilling grout leaking stoppage structure under complicated geological conditions includes: the device comprises a slurry stopping bag, a grouting pipe, a multipoint displacement measuring rod containing a protection pipe, a measuring point anchoring point and an exhaust pipe; the grout outlet of the grouting pipe is inserted into the bottom of the drilling hole (or the drilling hole is open), and the grout inlet is arranged outside the hole opening; one end of the exhaust pipe is arranged at the open (or hole bottom) of the drilling hole, and the other end of the exhaust pipe is arranged outside the hole opening; the side wall of the grout stopping bag is abutted against and covered on the inner wall of the drill hole of the geological defect part. The grouting bag filled with the grouting material plays a role in plugging, so that grouting liquid at the anchoring point section is prevented from leaking to the geological defect part, the compactness of grouting liquid at the measuring point anchoring point section is ensured, the measuring point anchoring point and the hole wall rock body are firmly connected and can synchronously deform, and the backfill grouting and plugging are completed at one time.

Description

Drilling grouting and plugging structure of multipoint displacement meter under complex geological conditions

Technical Field

The application relates to the technical field of grouting and plugging, in particular to a multi-point displacement meter drilling grouting and plugging structure under complex geological conditions.

Background

The multipoint displacement meter is a main monitoring instrument for monitoring deformation of a side slope and an underground cavity, is widely applied in engineering, is required to drill holes in a rock body when being installed, is provided with a plurality of (1-6) displacement measuring point anchoring points along different depths in the drill holes, is connected with the displacement measuring point anchoring points by using a stainless steel measuring rod (a measuring rod is sleeved with a PVC protective tube), and is led to an orifice and is connected with a displacement sensor; and after the installation is finished, drilling, backfilling and grouting are needed, the grouting is compact, and the anchoring point of the displacement measuring point is ensured to be firmly connected with the rock mass on the hole wall and synchronously deformed.

Complicated geological conditions such as faults, broken zones, cracks, karst cave and the like in a rock mass can be frequently met in engineering, and the condition of slurry leakage and slurry leakage can be caused by backfilling and grouting of a drilling hole. Once the conditions of running and slurry leakage are met, grouting in a drill hole cannot meet the compaction requirement, the situation that the anchoring points of the multipoint displacement measuring points are not firmly connected with the rock mass on the hole wall is caused, and the anchoring points of the displacement measuring points cannot synchronously deform with the surrounding rock mass. The drilling multipoint displacement meter cannot acquire data capable of truly reflecting rock mass displacement.

In the prior art, plugging grouting or repeated grouting is usually adopted until slurry is used for plugging a leakage channel, so that the compactness of drilling grouting can be guaranteed, and further the tight connection between a measuring point anchoring point and a hole wall rock mass is realized. However, repeated grouting is needed for many times, so that the consumption of grouting liquid is increased, and the required time is long; in the grouting process, leakage points continuously exist in the drill hole, and an ideal plugging effect is difficult to ensure by adopting the existing grouting method for treatment.

In the multipoint displacement meter measurement, the key of accurate measurement is that the tight connection of the measuring point anchoring point and the rock mass on the wall of the borehole can ensure the effective and reliable conduction of the deformation and the stress in the borehole, otherwise, the measurement distortion is easy to cause.

For the process of adopting a grout stopping bag, CN 202010853024.7 discloses a prestressed anchor cable structure suitable for breaking rock mass and a construction method thereof, one of the structures is that a grout stopping plug is arranged, but the grout stopping plug plays a role of isolating an anchoring section and a tensioning section, and can not realize the blocking of a geological defect area in a drilled hole, and the process of treating the geological defect area is carried out by carrying out multiple blocking grouting and then hole sweeping and pore forming processes in the prior art, wherein the blocking grouting and backfilling grouting are carried out separately.

Therefore, a method for quickly and effectively grouting and plugging the multi-point displacement meter drilling holes is needed under the complex geological conditions.

Disclosure of Invention

The utility model provides a multiple spot displacement meter drilling grout leaking stoppage structure under the complicated geological conditions to above-mentioned technical problem, can realize leaking stoppage and backfill grout one-time completion, simplified grout and leaking stoppage technology, have the engineering volume of saving, quick, reliable, convenient characteristics, ensure the compactness of drilling grout with minimum engineering volume, improved the installation quality of multiple spot displacement meter, and be applicable to the construction under all kinds of dangerous rock geological environment, can effectively avoid running, leak the thick liquid condition to take place, effectively improve measuring result accuracy.

Aiming at the complex geological conditions with geological defects, a mode of installing a slurry stopping bag at the geological defect part is adopted, one end of the slurry stopping bag enters slurry, the other end of the slurry stopping bag is exhausted and discharged, and the slurry stopping bags are respectively installed at the geological defect parts to form a slurry stopping bag string; the drilling grouting simultaneously performs grouting into the grouting stopping bag, the grouting stopping bag filled with the grouting plays a role in sealing and stopping leakage, the grouting is prevented from leaking to geological defect parts, grouting compactness of the measuring point anchoring section is guaranteed, the measuring point anchoring point and the rock body are firmly connected and can synchronously deform, and backfill grouting and stopping leakage are completed at one time.

The application provides a multiple spot displacement meter drilling grout leaking stoppage structure under complicated geological conditions, include: the device comprises a plurality of grout stopping bags, grouting pipes, a plurality of multipoint displacement measuring rods containing protection pipes, a plurality of displacement measuring point anchoring points and an exhaust pipe;

the grout outlet of the grouting pipe is inserted into the bottom of the drilling hole (or the opening of the drilling hole), and the grout inlet extends out of the drilling hole;

the side wall of the slurry stopping bag is abutted against and covered on the inner wall of the drilling hole of the geological defect part;

an anchoring point section is arranged between any two adjacent slurry stopping bags; an anchoring point section is arranged between the slurry stopping bag and the hole bottom and between the slurry stopping bag and the hole opening;

the grout stopping bag comprises: canvas bag, slurry inlet pipe, exhaust slurry outlet pipe, geotextile slurry stopping strip and iron wire; the canvas bag body is provided with a slurry inlet pipe towards one end of the slurry outlet of the grouting pipe; an exhaust slurry outlet pipe is arranged at one end of the canvas bag body, which is far away from the slurry outlet of the grouting pipe;

the diameter of the canvas bag body is slightly larger than the diameter of the drilling hole; the length of the canvas bag body is more than 2 times of the length of the geological defect on the inner side wall of the drill hole, and is not less than 1m;

the extension ends of the multipoint displacement measuring rods containing the protection pipes are provided with displacement measuring point anchoring points; the displacement measuring point anchoring point is arranged in the anchoring point section, and the anchoring point section needs grouting compaction to ensure that the measuring point anchoring point is firmly connected with the rock mass on the wall of the drilling hole and can synchronously deform;

one end of the exhaust pipe is arranged at the open (or hole bottom) of the drilling hole, and the other end extends out of the drilling hole;

the installation and use method of the structure comprises the following steps:

step S1: after drilling is completed, determining the number, depth and area of geological defect parts in the drilling according to the geological conditions described by the core or the drilling television;

step S2: assembling a multipoint displacement meter measuring rod (comprising a protective tube), a measuring point anchoring point, a grouting tube and an exhaust tube according to design requirements, wherein the measuring point anchoring point is arranged at the extending end of the measuring rod comprising the protective tube;

step S3: binding a plurality of grout stopping bags on the assembled multipoint displacement meter measuring rod containing the protection pipe and the grouting (exhaust) pipe according to the number, depth and area of the geological defect parts, wherein the grout stopping bags are arranged opposite to the geological defect parts, and displacement measuring point anchoring points are arranged between any two adjacent grout stopping bags, between the grout stopping bags and the bottom of a drill hole and between the grout stopping bags and the drill hole;

the number of the grout stopping bags is equal to that of the geological defect parts; the number of the multipoint displacement measuring rods with the protective tubes is equal to the number of the anchoring points of the displacement measuring points;

step S4: the multipoint displacement meter assembly (measuring rod, protecting pipe, measuring point anchor point, grouting pipe and exhaust pipe) wrapped with the grout stopping bag is sent into a drill hole, and after the multipoint displacement meter assembly is installed in place, the drill hole opening is sealed, and smoothness of the grouting pipe and the exhaust pipe is required to be kept;

step S5: grouting into a drill hole through a grouting pipe, filling the first anchoring point section with grout, filling the grout into a first grout stopping bag through a grout stopping bag grouting pipe, filling the grout stopping bag with grout to form a covering and plugging for a geological defect part, allowing the grout to flow into an adjacent second anchoring point section from the first grout stopping bag through an exhaust grout outlet pipe, and allowing the grout to enter the second grout stopping bag through a grout inlet pipe of the second grout stopping bag after the second anchoring point section is filled with grout;

step S6: and S5, repeating the step until each anchoring point section and each grout stopping bag in the drilled hole are full of grout, and continuously grouting until the air outlet outside the hole opening of the drilled hole overflows the grout outwards, and stopping grouting.

Preferably, openings are arranged at two ends of the canvas bag body; one end of the grout outlet of the grouting pipe is provided with a grout inlet pipe of the grout stopping bag, and the other end is provided with a grout outlet pipe of the grout stopping bag for exhausting.

Preferably, the protection pipe measuring rod, the grouting pipe, the exhaust pipe, the slurry inlet pipe and the slurry outlet pipe at the openings at the two ends of the canvas bag body are bound through geotextile slurry stopping strips, and iron wires are arranged to bind the openings at the two ends of the canvas bag body together with the protection pipe measuring rod, the grouting pipe, the exhaust pipe, the slurry inlet pipe and the slurry outlet pipe.

Preferably, the length of the anchoring point segment is between 1m and 3m.

Preferably, 1-5 grout stopping bags are arranged in one drilling hole according to geological defect conditions.

Preferably, the geological defect is at least one of a fault, a fractured zone, a fracture, and a karst cave.

Preferably, the slurry inlet of the grouting pipe in the drilling hole is arranged outside the drilling hole, and the slurry outlet is arranged at the bottom (or the opening) of the drilling hole.

Preferably, one end of the exhaust pipe in the drill hole is inserted into the open (or hole bottom) of the drill hole, and the other end extends out of the drill hole;

preferably, the multipoint displacement measuring rod with the protection tube comprises: a measuring rod and a protective tube; the measuring rod is sleeved with a protective tube; the measuring rod is a stainless steel rod; the protection tube is a PVC tube.

The beneficial effects that this application can produce include:

1) The utility model provides a multiple spot displacement meter drilling grout leaking stoppage structure under complicated geological conditions adopts the mode of stopping the thick liquid package at geological defect position installation, and through drilling grout simultaneously in stopping the thick liquid package slip casting, the thick liquid package of stopping through the slip casting plays the leaking stoppage effect, has guaranteed the compactibility of measurement station anchor section grouting liquid, realizes that measurement station anchor point and rock mass firm in connection and can synchronous deformation, guarantees to backfill grout and leaking stoppage disposable completion.

2) According to the multi-point displacement meter drilling grouting plugging structure under the complex geological conditions, when the measuring rod section passes through the complex geological condition part under the complex geological conditions with geological defects, the outside of the measuring rod section is wrapped with the grout stopping bag, after the grout stopping bag is filled with grout, the grout stopping bag is tightly attached to the hole wall to cover the geological defect part, so that the grout stopping plugging effect is achieved, the compactness of grouting of the measuring point anchoring section is guaranteed, the stability of the measuring rod is protected, the grouting process is simplified, the grouting engineering quantity is saved, and backfilling grouting and plugging are completed at one time.

Drawings

FIG. 1 is a schematic longitudinal section view of a multi-point displacement meter drilling grouting plugging structure for horizontal or declined drilling in an embodiment of the present application

FIG. 2 is a schematic longitudinal section view of a multi-point displacement meter drilling grouting plugging structure for an upward-inclined drilling in the embodiment of the application;

FIG. 3 is a schematic diagram showing the measurement results of the multipoint displacement meter obtained in the comparative example using the prior art construction method;

FIG. 4 is a schematic diagram of measurement results of a multi-point displacement meter obtained by an embodiment of a method for drilling and grouting plugging structures provided by the present application;

legend description:

1. drilling holes; 2. a multipoint displacement meter measuring rod with a protection tube; 3. displacement measuring point anchor points (31, first anchor points, 32, second anchor points); 4. grouting pipes; 5. a pulp stop pack (51, a first pulp stop pack; 52, a second pulp stop pack); 6. a slurry inlet pipe; 7. an exhaust slurry outlet pipe; 8. an iron wire; 9. geotextile grout stop strips; 10. an exhaust pipe; 11. the surface of the rock mass.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Accordingly, the following detailed description of the embodiments of the present application, provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application.

Technical means which are not described in detail in the application and are not used for solving the technical problems of the application are all arranged according to common general knowledge in the field, and various common general knowledge arrangement modes can be realized.

Referring to fig. 1-2, the multi-point displacement meter drilling grouting plugging structure under complex geological conditions adopts canvas to process into a slurry stopping bag, wherein the canvas bag is a canvas bag with two open ends, one end of the slurry stopping bag is provided with a slurry inlet pipe 6, the other end of the slurry stopping bag is provided with an exhaust slurry outlet pipe 7, the slurry stopping bag is fixedly sleeved outside a measuring rod 2 containing a protection pipe and a grouting pipe 4, two ends of the slurry stopping bag are fastened by iron wires 8, and the slurry stopping bag is arranged in geological defect parts such as faults, broken belts, karst cave and the like in a drilling hole 1; each geological defect part is provided with a grout stopping bag to form a grout stopping bag string (the number of the grout stopping bags is 1-5 according to the number of the geological defect parts and the displacement measuring point anchoring points 3), an anchoring point section is arranged between the two grout stopping bags, and the length of the anchoring point section ranges from 1m to 3m.

After the drilling 1 is completed, geological defect ranges such as faults, broken zones, cracks, karst cave and the like are determined according to the drilling core or drilling television description geological conditions, a slurry stopping bag 5 is prefabricated by canvas according to the geological defect ranges, the diameter of the slurry stopping bag 5 is slightly larger than that of the drilling 1, and the length is more than 2 times of the geological defect range and not smaller than 1m; after a multipoint displacement meter measuring rod 2 with a protection tube, an anchoring point 3, a grouting tube 4 and an exhaust tube 10 are assembled, sequentially sleeving a grout stopping bag 5, placing the grout stopping bag 5 at a position corresponding to a geological defect range, respectively placing a grout inlet tube 6 and an exhaust grout outlet tube 7 at two ends of the grout stopping bag 5, respectively binding the grout stopping strips 9 with geotechnical cloth on the multipoint displacement meter measuring rod 2 with the protection tube, the grouting tube 4 (or the exhaust tube 10), the grout inlet tube 6 and the exhaust grout outlet tube 7 to prevent grout leakage, and then binding two ends of the grout stopping bag 5 with iron wires 8; and each geological defect part is provided with a grout stopping bag 5 to form a grout stopping bag string. After the grout stopping package string is installed, the components including the protection pipe multipoint displacement meter measuring rod 2, the anchoring point 3, the grouting pipe 4, the exhaust pipe 10 and the like which are wrapped up the grout stopping package string are sent into the drilling hole 1, then the orifice of the drilling hole 1 is sealed until the orifice is flush with the rock surface 11, and backfilling grouting of the drilling hole 1 can be carried out.

Grouting from a slurry inlet of the orifice grouting pipe 4 to the inside of the hole during grouting, grouting the first anchoring point section 31 in the slurry injection hole, injecting the slurry into the first slurry stopping bag 51 from the slurry inlet pipe 6 of the first slurry stopping bag 51 after the slurry of the first anchoring point section 31 is fully filled, and discharging the gas in the slurry stopping bag 51 from the gas discharge slurry outlet pipe 7 at the other end; after the slurry of the first slurry stopping bag 51 is fully filled, the canvas of the slurry stopping bag 51 is tightly attached to the hole wall, the geological defect part is covered, the slurry before and after the slurry stopping bag 51 can not leak to the geological defect part, the continuously injected slurry is injected into the second anchoring point section 32 through the exhaust slurry outlet pipe 7 of the first slurry stopping bag, and the slurry is injected into the second slurry stopping bag 52 after the second anchoring point section 32 is fully filled (the process is the same as that of the previous slurry stopping bag; grouting is continued in sequence until the anchoring point section of the full hole and the grout stopping bag are filled, and grouting is stopped after grout flows out of the exhaust pipe 10.

The structure is shown in fig. 1-2, and specifically comprises: drilling 1, multiple spot displacement meter measuring staff and protection tube 2, displacement measurement station anchor point 3, grout pipe 4, blast pipe 10, the canvas of parcel in the outside that contains protection tube multiple spot displacement meter measuring staff 2, grout pipe 4 and blast pipe 10 ends thick liquid package 5, advances thick liquid pipe 6, the thick liquid pipe 7 is gone out in the exhaust, iron wire 8, geotechnique's cloth ends thick liquid strip 9 etc. constitutes "multiple spot displacement meter drilling grout leak-stopping structure under the complex geological condition that this application provided".

In one embodiment, a method of installing a grouting plugging structure for a horizontal or declined borehole

Referring to fig. 1, a hole bottom grouting and hole vent method is adopted. The specific implementation process comprises the following steps:

step S1: after the drilling 1 is completed, geological conditions are described according to a rock core or a drilling television, geological defect ranges such as faults, broken zones and karst cave are determined, and a grout stopping bag 5 is manufactured in advance by canvas according to the geological defect ranges; the diameter of the grout stopping bag 5 is slightly larger than the inner diameter of the drill hole 1, and the length of the grout stopping bag 5 is more than 2 times of the geological defect range and is not smaller than 1m.

Step S2: the multi-point displacement meter measuring rod 2 with the protection tube, the measuring point anchor point 3, the grouting tube 4 and the exhaust tube 10 are assembled according to design requirements, a grout outlet of the grouting tube 4 is placed at the bottom of a hole, a grout inlet is arranged outside the hole, one end of the exhaust tube 10 is arranged in the hole, and the other end of the exhaust tube is arranged outside the hole.

The manufactured grout stopping bag 5 is sleeved on the multipoint displacement measuring rod 2 containing the protection pipe and the grouting pipe 4, the grout stopping bag 5 is placed at a position corresponding to the geological defect range, the grout inlet pipe 6 is arranged at one end of the grout stopping bag 5 close to the hole bottom, and the air exhaust grout outlet pipe 7 is arranged at one end of the grout stopping bag 5 close to the hole opening;

step S3: the two ends of the grout stopping bag 5 are tightly tied by iron wires 8; and each geological defect part is provided with a grout stopping bag 5 to form a grout stopping bag string.

Step S4: after the grout stopping package string is installed, the multi-point displacement measuring rod 2 containing the protection pipe, the anchoring point 3, the grouting pipe 4 and the exhaust pipe 10 which are wrapped up in the grout stopping package string are sent into the drilling hole 1, then the orifice of the drilling hole 1 is sealed, and backfilling grouting operation of the drilling hole 1 can be carried out.

Step S5: during grouting, grouting is carried out from a grouting pipe 4 outside an orifice to the inside of the hole, grouting is started from a first anchoring point section 31 after grouting is carried out to the bottom of the hole of the drill hole 1 through a grouting pipe 4 outlet, after grouting is carried out in the first anchoring point section 31, grouting is carried out from a grouting pipe 6 of a first grouting stopping bag 51, grouting is carried out in the grouting stopping bag 51, and gas is discharged from an exhaust grouting pipe 7 at the other end of the bag; after the slurry in the slurry stopping bag 51 is filled, the canvas side wall of the slurry stopping bag 51 is tightly attached to the hole wall, so that the geological defect part at the corresponding position of the slurry stopping bag 51 is effectively covered.

After the grout stopping bag 51 bulges, the covering and blocking of the geological defect is realized, so that the grout in the front and rear areas of the grout stopping bag 51 cannot leak into the geological defect, the grout flowing out of the grouting pipe 4 is continuously injected into the grout stopping bag 51, and the grout is discharged from the air exhaust grout outlet pipe 7 of the grout stopping bag 51 and injected into the second anchoring point section 32.

After the second anchor point segment 32 is filled, the grout is injected into the second grout stop pack 52 (the process is the same as the previous grout stop pack grouting process and is not described here); the grouting pipe 4 can sequentially and continuously grouting the first anchoring point section 31, the first grouting stopping bag 51, the second anchoring point section 32, the second grouting stopping bag 52, the subsequent anchoring point sections and the grouting stopping bags until the whole drilling hole 1 is full of slurry, and the grouting is stopped after the slurry fills the hole opening section and flows out of the slurry from the exhaust pipe 10 arranged at the hole opening.

The slurry stopping bag 5 made of canvas can maintain the original shape in the drilling hole 1, and grouting liquid is prevented from overflowing from the joint of the slurry stopping bag 5 and the inner wall of the drilling hole 1 to enter a geological defect area, so that the slurry stopping bag 5 is utilized to effectively cover the geological defect, and leakage and slurry leakage are prevented.

In one embodiment, the step of installing the grouting plugging structure for the two-step up-inclined drilling hole

Referring to fig. 2, the method of grouting holes and exhausting holes at the bottom is adopted. After the drilling 1 is completed, geological defect ranges such as faults, broken zones, cracks, karst cave and the like are determined according to geological conditions described by a rock core or a drilling television, a slurry stopping bag 5 is prefabricated by canvas according to the geological defect ranges, the diameter of the slurry stopping bag 5 is slightly larger than that of the drilling 1, and the length is more than 2 times (not smaller than 1 m) of the geological defect ranges; the multipoint displacement meter comprises a protective tube multipoint displacement meter measuring rod 2, a measuring point anchor point 3, a grouting pipe 4, an exhaust pipe 10 and the like, wherein a grout outlet of the grouting pipe 4 is arranged at a position which is 1m away from an orifice in a hole, a grout inlet is arranged outside the orifice, one end of the exhaust pipe 10 is arranged at the bottom of the hole, and the other end of the exhaust pipe is arranged outside the orifice.

Sleeving a manufactured slurry stopping bag 5 on a multipoint displacement measuring rod 2 containing a protective tube and an exhaust pipe 10, placing the slurry stopping bag 5 at a position corresponding to a geological defect range, placing a section of slurry inlet pipe 6 at the end of the slurry stopping bag 5 close to an orifice, placing a section of exhaust slurry outlet pipe 7 at the bottom end of the slurry stopping bag 5 close to the orifice, respectively binding the two ends of the slurry stopping bag containing the protective tube and multipoint displacement measuring rod 2, the exhaust pipe 10, the slurry inlet pipe 6 and the exhaust slurry outlet pipe 7 by geotechnical cloth slurry stopping strips 9 to prevent slurry leakage, and then binding the two ends of the slurry stopping bag 5 by iron wires 8; and each geological defect part is provided with a grout stopping bag 5 to form a grout stopping bag string.

After the grout stopping package string is installed, the multi-point displacement measuring rod 2 containing the protection pipe, the anchoring point 3, the grouting pipe 4 and the exhaust pipe 10 which are wrapped up by the grout stopping package string are sent into the drilling hole 1, then the orifice of the drilling hole 1 is sealed, and backfilling grouting of the drilling hole 1 can be carried out. Grouting from a grouting pipe 4 grouting port of an orifice to the inside of the orifice, grouting slurry from a grouting pipe 4 grouting port to an orifice section from a first anchoring point section 31, injecting slurry into a grouting bag 51 from a grouting pipe 6 of a first grouting bag 51 after the first anchoring point section 31 is fully filled with slurry, and discharging gas from an exhaust grouting pipe 7 at the other end of the grouting bag 51; after the grout of the grout stopping bag 51 is fully filled, the canvas of the grout stopping bag 51 is tightly attached to the hole wall to cover the geological defect part, and the grout before and after the grout stopping bag 51 can not leak to the geological defect part; the continuously injected grout is injected into the second anchoring point section 32 through the exhaust grout outlet pipe 7 of the first grout stopping bag 51, after the second anchoring point section 32 is fully injected with grout, the grout is injected into the second grout stopping bag 52 through the grout inlet pipe of the second grout stopping bag 52 (the process is the same as the grouting process of the previous grout stopping bag), and the grouting is continuously carried out on the subsequent anchoring point section and the grout stopping bag in sequence until the whole grout of the drilling hole 1 is fully injected, and the grout flows out from the hole bottom to the hole opening through the exhaust pipe 10 and then stops grouting.

When this application is to the multi-point displacement meter installation of drilling 1, adopt the mode of stopping the thick liquid package at geological defect position measuring rod section installation, through drilling 1 grout simultaneously in stopping thick liquid package 5, the thick liquid package 5 that ends of slip casting has covered geological defect position, has played the effect of leaking stoppage, has guaranteed the compactibility of filling thick liquid in the anchor point section, and each displacement measuring point anchor point 3 is firm in connection and can synchronous deformation with the rock mass, has realized backfilling grout and leaking stoppage disposable completion.

The engineering practice shows that under the complex geological condition with geological defects, the device and the method for grouting and plugging the multi-point displacement meter drilling holes ensure that the slurry in the drilling holes 1 is densely filled, the device has the characteristics of saving engineering quantity, being quick, reliable and convenient, simplifying construction process, ensuring the grouting compactness of the drilling holes 1 by using the minimum engineering quantity, ensuring the installation quality of the multi-point displacement meter, and having wide application value in other similar engineering.

Example 1:

the method comprises the steps that a 4-point type multipoint displacement meter installed on a side slope of a certain hydropower engineering is buried in a position of a drilling depth of 5m, 15m, 30m and 50m respectively, 2 fault fracture zones exist at the drilling depths of about 11m and 26m through detection of a drilling television, the fault fracture bandwidth is about 0.8 m-1.2 m, and backfill grouting is carried out after a grout stopping bag is arranged at the 2 fault fracture zones through the method of adopting the multipoint displacement meter drilling grouting plugging structure; the measured displacement deformation process line is shown in the following figure 4, and as can be seen from the figure 4, the deformation rule of all 4 measuring points is normal, which indicates that the 4 measuring point anchoring points are firmly connected with the hole wall rock mass and can synchronously deform, the backfill grouting of the drilling hole is compact, and the slurry leakage and slurry leakage condition does not occur.

Comparative example 1:

a4-point type multipoint displacement meter is arranged on a side slope of a certain hydropower engineering, displacement measuring point anchoring points are respectively buried in positions 2m, 5m, 10m and 20m deep in a drilling hole, backfilling and grouting are carried out on the drilling hole according to the existing method, the measured displacement deformation process line is shown in a figure 3, and as can be seen from the figure 3, the deep measuring point at the position 20m has almost no deformation, and the measuring points at the rest depths have certain deformation.

The rule of the measurement result of the multipoint displacement meter is that the deeper the depth is, the larger the deformation is, the result of the multipoint displacement meter provided by the comparative example at the measuring points of 2m, 5m and 10m accords with the rule, the deformation of the measuring point at the depth of 20m is smaller, and the deformation rule is abnormal; from geological description of core drilling, a fault fracture zone is arranged at the position of about 17m of the hole depth, and the analysis is based on the fact that the hole is not subjected to drilling grouting plugging treatment, grouting slurry leaks from the fault fracture zone, so that grouting of the section is not compact, and then a 20m deep measuring point anchoring point is not firmly connected with the wall of the drilled hole, and the measuring result of the 20m deep measuring point is distorted.

The results obtained in the comparative example 1 and the example 1 show that the backfilling, grouting and plugging are completed at one time by adopting the device and the method provided by the application, so that the connection reliability of the measuring point anchoring point and the borehole wall is effectively improved, and the device and the method are applicable to various geological environments, and are especially applicable to geological environments with leakage points under complex geological conditions.

Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present application.

Claims (8)

1. The utility model provides a multiple spot displacement meter drilling grout leaking stoppage structure under complicated geological conditions which characterized in that includes: the device comprises a plurality of grout stopping bags, grouting pipes, a plurality of multipoint displacement measuring rods containing protection pipes, a plurality of displacement measuring point anchoring points and an exhaust pipe;

the grout outlet of the grouting pipe is inserted into the bottom of the drilling hole or the opening of the drilling hole, and the grout inlet extends out of the drilling hole;

the two side walls of the slurry stopping bag are abutted against and cover the inner wall of the drilling hole at the geological defect part;

the anchoring point sections are arranged between any two adjacent slurry stopping bags, between the hole bottoms and the slurry stopping bags and between the hole openings and the slurry stopping bags;

the grout stopping bag comprises: canvas bag, slurry inlet pipe, exhaust slurry outlet pipe, geotextile slurry stopping strip and iron wire; one end of the canvas bag body facing the hole bottom is provided with a slurry inlet pipe; an exhaust slurry outlet pipe is arranged at one end of the canvas bag body far away from the hole bottom;

the diameter of the canvas bag body is slightly larger than the diameter of the drilling hole; the length of the canvas bag body is more than 2 times of the length of the geological defect on the inner side wall of the drill hole;

the extension ends of the multipoint displacement measuring rods containing the protection pipes are provided with displacement measuring point anchoring points;

the displacement measuring point anchoring points are arranged in each anchoring point section; grouting compaction is needed for each anchoring point section so as to ensure that the anchoring points of the measuring points are firmly connected with the rock mass on the hole wall and can synchronously deform;

one end of the exhaust pipe is inserted into the open or bottom of the drilling hole, and the other end extends out of the drilling hole;

the installation and use method of the structure comprises the following steps:

step S1: detecting the number, depth and area of geological defect parts in the drilled hole after the drilling;

step S2: according to the number, depth and area of geological defect parts, after a multi-point displacement measuring rod with a protection pipe, a measuring point anchoring point and a grouting pipe are assembled, binding a plurality of grout stopping bags on the multi-point displacement measuring rod with the protection pipe and the grouting pipe, wherein the grout stopping bags are arranged opposite to the geological defect parts, measuring point anchoring points are respectively arranged between any two adjacent grout stopping bags, between each grout stopping bag and a drill hole bottom and between each grout stopping bag and each drill hole, the measuring point anchoring points are arranged on the extending end of the multi-point displacement measuring rod with the protection pipe, and exhaust pipes are arranged at the drill holes to seal the drill hole;

the number of the grout stopping bags is equal to that of the geological defect parts; the number of the multipoint displacement measuring rods with the protective tubes is equal to the number of the anchoring points of the displacement measuring points;

step S3: grouting into a drill hole through a grouting pipe, filling the first anchoring point section with grout, filling the grout into the first grout stopping bag through a grout inlet pipe of the first grout stopping bag, filling the grout into the first grout stopping bag until the grout stopping bag bulges, after plugging a geological defect part, flowing the grout into a second anchoring point section between the adjacent first grout stopping bag and the second grout stopping bag, and after filling the second anchoring point section with grout, entering the second grout stopping bag through a grout inlet pipe of the second grout stopping bag;

step S4: and (3) repeating the step (S3) until each grout stopping bag and each anchoring point section in the drill hole are full of grout, and continuously grouting until the grout overflows outwards from the air outlet of the drill hole opening, and stopping grouting.

2. The multi-point displacement meter drilling grouting plugging structure under complex geological conditions according to claim 1, wherein openings are formed at two ends of the canvas bag body; the pulp inlet pipe and the exhaust pulp outlet pipe are respectively inserted into the openings at the two ends.

3. The multi-point displacement meter drilling grouting plugging structure under complex geological conditions according to claim 1, wherein geotextile grout stop strips are wrapped on a multi-point displacement meter measuring rod, a grouting pipe, a grout inlet pipe and an exhaust grout outlet pipe which are connected with openings at two ends of a canvas bag body.

4. The multi-point displacement meter drilling grouting plugging structure under complex geological conditions according to claim 1, wherein iron wires are arranged at the connection parts of openings at two ends of the canvas bag body to be tightly tied and sealed.

5. The multi-point displacement meter drilling grouting plugging structure under complex geological conditions according to claim 1, wherein the length of the anchoring point section is between 1m and 3m.

6. The multi-point displacement meter drilling grouting plugging structure under complex geological conditions according to claim 1, wherein 1-5 grout stopping bags are arranged in one drilling hole according to the number of geological defects.

7. The multi-point displacement meter drilling grouting plugging structure under complex geological conditions according to claim 1, wherein the geological defect is at least one of faults, fractured zones, cracks and karst cave.

8. The multi-point displacement meter drilling grouting plugging structure under complex geological conditions according to claim 1, wherein the multi-point displacement meter measuring rod with the protection tube comprises: a measuring rod and a protective tube; the measuring rod is sleeved with a protective tube; the measuring rod is a stainless steel rod; the protection tube is a PVC tube.

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