CN111650584A - Method and equipment for detecting reinforcement effect of shield tunnel through grouting behind wall - Google Patents
Method and equipment for detecting reinforcement effect of shield tunnel through grouting behind wall Download PDFInfo
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- 230000000694 effects Effects 0.000 title claims abstract description 71
- 230000002787 reinforcement Effects 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000002002 slurry Substances 0.000 claims abstract description 159
- 230000000149 penetrating effect Effects 0.000 claims abstract description 46
- 230000007547 defect Effects 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 230000001360 synchronised effect Effects 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000010276 construction Methods 0.000 claims abstract description 16
- 239000011440 grout Substances 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 19
- 238000005070 sampling Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 230000002950 deficient Effects 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims 1
- 230000008859 change Effects 0.000 description 7
- 239000011435 rock Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000007569 slipcasting Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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Abstract
The invention discloses a method and equipment for detecting the reinforcement effect of shield tunnel wall post-grouting, and belongs to the technical field of tunnel engineering detection. The detection method comprises the following steps: in the construction process of the shield tunnel, indicator slurry is injected into the back of the shield tunnel wall through a grouting hole reserved on a duct piece; the flow position, range and depth of indicator slurry are detected by using the ground penetrating radar, the grouting reinforcement effect of the rear defect position of the shield tunnel wall is judged according to the flow position, range and depth, all the segments in the synchronous grouting range are integrally detected by using the ground penetrating radar, and secondary grouting is performed on the defect part which does not meet the rear grouting reinforcement effect of the shield tunnel wall. The device comprises a ground penetrating radar and a support component. The invention adopts the ground penetrating radar to detect the indicator slurry with the indicating function so as to quickly acquire the flow position, range and depth of clear and accurate grouting slurry in real time, thereby providing accurate basis for observing grouting reinforcement effect and adjusting grouting parameters.
Description
Technical Field
The invention belongs to the technical field of detection of tunnel engineering, and particularly relates to a method and equipment for detecting the reinforcement effect of shield tunnel wall post-grouting.
Background
The construction of underground rail transit is carried out by the restriction of ground space and urban design and planning. The tunnel constructed by the shield method is more and more widely applied to urban underground rail transit construction due to the advantages of small construction disturbance, adaptability to weak geology, high tunneling speed and the like. Due to the limitation of the construction process, the shield tunnel tunneling construction can cause stratum disturbance, gaps are formed between tunnel segments and surrounding rocks, stress of the surrounding rocks near the rear part of the tunnel wall is redistributed, and if the stress is not timely processed, a series of hazards such as stratum loss, surface subsidence and the like can be caused. In order to reduce the occurrence and development of the hazards, reinforcement and maintenance can be carried out in the shield tunnel construction process in actual engineering so as to ensure the construction safety of the tunnel.
The conventional shield tunnel reinforcing method mainly comprises grouting, and comprises ground punching grouting reinforcement, tunnel inner deep hole grouting reinforcement and the like. However, for the actual closed shield, a grouting reinforcement method is adopted, and whether grouting slurry is filled to a required defect position cannot be effectively observed; secondly, the required grout amount of different country rock situations is different, if the slip casting volume exceeds required amount, can lead to extrudeing around ground body, derives a series of engineering potential safety hazards, also can bring unnecessary waste, if the slip casting volume is too little, fill not closely knit, can influence the slip casting and consolidate the effect. However, there is no effective method for determining the grouting amount at present, the engineering mainly depends on the similar engineering experience, and similar detection results cannot provide enough basis and data support for determining the grouting amount; finally, due to the fluidity and quick drying of the slurry, the grouting effect is evaluated by the change of the grouting pressure in the conventional method, and the accuracy is difficult to guarantee.
Therefore, the grouting reinforcement effect does not have a good detection method and evaluation standard at present, so that a reasonable grouting detection method and evaluation system are established, and the real-time mastering of the grouting filling position and filling amount has very important significance on the grouting reinforcement effect of the shield tunnel.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a method and equipment for detecting the grouting reinforcement effect behind the shield tunnel wall, which are used for synchronously detecting the distribution condition of indicator grout around a grouting hole by using a ground penetrating radar in the construction process of the shield tunnel, judging the grouting reinforcement effect of the defect position behind the shield tunnel wall according to the flowing position, range and depth of the indicator grout, and continuously grouting by adjusting the grouting parameters of the indicator grout in real time so as to meet the grouting reinforcement effect. According to the invention, the flow position, range and depth of the grouting slurry are rapidly and clearly obtained in real time by detecting the indicator slurry with the indicating function, so that the grouting filling position and filling amount can be mastered in real time, and accurate basis is provided for observing the grouting reinforcement effect and adjusting grouting parameters.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for detecting a reinforcement effect of shield tunnel wall post-grouting, comprising the steps of:
s1, in the process of shield tunnel construction, indicator slurry is injected into the back of the shield tunnel wall through a grouting hole reserved on a segment;
s2 detecting the flowing position, range and depth of the indicator slurry by using the ground penetrating radar;
s3, judging the grouting reinforcement effect of the rear defect position of the shield tunnel wall according to the flowing position, range and depth of the indicator grout, if the grouting reinforcement effect is met, completing synchronous grouting, and entering step S4, otherwise, adjusting the grouting parameters of the indicator grout according to the flowing position, range and depth of the indicator grout, returning to step S1 until the grouting reinforcement effect is met, completing synchronous grouting, and entering step S4;
s4, integrally detecting all the segments in the synchronous grouting range by using the ground penetrating radar, judging whether the reinforcing effect of the shield tunnel wall back grouting meets the requirement or not according to the integral detection result, stopping grouting if the reinforcing effect of the shield tunnel wall back grouting meets the requirement, and otherwise, performing secondary grouting on the defect part which does not meet the reinforcing effect of the shield tunnel wall back grouting until the reinforcing effect of the shield tunnel wall back grouting meets the requirement.
Further preferably, step S1 further includes the steps of:
and mixing the slurry indicator into the slurry according to a preset proportion, and uniformly stirring to prepare the indicator slurry with the indicating function.
As a further preferred, the slurry indicator is a metal substance, and preferably, the slurry indicator is iron chips or iron powder.
Further preferably, step S2 further includes the steps of:
s21, detecting and collecting the flowing position and distribution data of the slurry indicator in the indicator slurry by using a ground penetrating radar;
s22 obtains the flow position, range and depth of the indicator slurry according to the flow position and distribution data of the slurry indicator in the indicator slurry.
Further preferably, step S21 further includes the steps of:
s211, detecting and collecting T by using ground penetrating radariTime and Ti+1The reflected signal of the slurry indicator in the slurry of the time indicator, wherein i is more than or equal to 0;
s212 is according to TiTime and Ti+1Obtaining T from the reflected signal of the slurry indicator in the slurry of the time indicatoriTime and Ti+1A distribution image of the slurry indicator in the time indicator slurry;
s213 converting TiTime and Ti+1And comparing the distribution images of the slurry indicators in the indicator slurry at the moment to acquire the flowing position and distribution data of the slurry indicators in the indicator slurry.
As a further preferable step, the step of acquiring the distribution image of the slurry indicator in the indicator slurry in step S212 is as follows:
firstly, converting a reflected signal of a slurry indicator in indicator slurry into a sampling chart with a plurality of discrete points;
then, the image global contour features of the sampling diagram are extracted to obtain a distribution image of the slurry indicator in the indicator slurry.
Preferably, in step S4, the secondary grouting of the defect portion that does not satisfy the effect of the shield tunnel wall post-grouting reinforcement specifically includes the following steps:
s41, positioning the defect part according to the overall detection result and determining the position of the defect part;
s42, injecting indicator slurry into the defect part according to the position of the defect part, and executing the step S2 and the step S3 until the shield tunnel wall post-grouting reinforcement effect meets the requirement.
According to another aspect of the invention, the device for the detection method comprises a ground penetrating radar and a supporting component;
the ground penetrating radar is used for detecting the flowing position, range and depth of the indicator slurry when the indicator slurry is injected into the rear of the shield tunnel wall through the reserved grouting hole in the duct piece, and judging the grouting reinforcement effect of the rear defect position of the shield tunnel wall according to the flowing position, range and depth of the indicator slurry;
the supporting component is used for supporting the ground penetrating radar and providing motion power in the detection process of the ground penetrating radar. As a further preferred, the ground penetrating radar comprises a host, a transmitter, a transmitting antenna, a receiver and a receiving antenna, wherein,
the host is used for sending a control command to the transmitter and the receiver, the transmitter transmits electromagnetic waves to the underground according to the command of the host, the receiver starts data acquisition according to the control command and converts a received reflected signal of the indicator into a digital signal to be transmitted to the host, the host constructs a distribution image of the slurry indicator in the slurry indicator according to the digital signal, so that the flowing position, the flowing range and the flowing depth of the slurry indicator are obtained, and the grouting reinforcement effect of the rear defect position of the shield tunnel wall is judged according to the flowing position, the flowing range and the flowing depth of the slurry indicator.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the detection method provided by the invention utilizes the ground penetrating radar to detect the flowing position, range and depth of the indicator slurry in real time in the shield tunnel construction process, judges the grouting reinforcement effect of the rear defect position of the shield tunnel wall according to the flowing position, range and depth of the indicator slurry, and adjusts the grouting parameters of the indicator slurry in real time, so that the grouting filling position and filling amount can be mastered in real time, and accurate basis is provided for observing the grouting reinforcement effect and adjusting the grouting parameters. The method can directly detect the flowing position, range and depth of the indicator slurry with the indicating function, so that the grouting filling position and filling amount can be mastered in real time, accurate basis is provided for observing the grouting reinforcement effect and adjusting the grouting parameters, and errors caused by the change of the grouting pressure in the grouting process are avoided.
(2) The detection method of the invention mixes the slurry indicator into the slurry according to the preset proportion and stirs the slurry evenly to prepare the indicator slurry with the indicating function, wherein, the slurry indicator is a metal substance, preferably, the slurry indicator is scrap iron or iron powder, the indicator has good conductivity and strong reflection function to electromagnetic waves, thereby, in the grouting process, the flowing position, the range and the depth of the indicator slurry can be obtained by directly detecting the flowing condition and the distribution range of the indicator, the grouting filling position and the filling amount can be mastered in real time, and accurate basis is provided for observing the grouting reinforcement effect and adjusting the grouting parameters. The indicator has the characteristics of low cost, easy acquisition, no abnormal influence on the mechanical property and the reinforcing property of the slurry, no increase in pollution to the underground environment and the like.
(3) The detection method converts the reflection signal of the slurry indicator in the indicator slurry into a sampling graph with a plurality of discrete points, and then extracts the image global contour characteristics of the sampling graph to obtain the distribution image of the slurry indicator in the indicator slurry, so that the flow position, the range and the depth of the indicator slurry can be quickly and accurately constructed, the grouting filling position and the filling amount can be mastered in real time, and accurate basis is provided for observing the grouting reinforcement effect and adjusting the grouting parameters.
(4) The detection method of the invention also needs to carry out integral detection on all the pipe pieces in the synchronous grouting range, and carries out secondary grouting on the defective part according to the position of the defective part, so that the grouting reinforcement effect after the shield tunnel wall meets the requirement, the integral grouting effect is more comprehensive and excellent, and the grouting reinforcement effect system is perfected.
(5) According to the device, the ground penetrating radar is used for detecting the flowing position, the range and the depth of the indicator slurry in the synchronous grouting process in real time, judging the grouting reinforcement effect of the rear defect position of the shield tunnel wall according to the flowing position, the range and the depth of the indicator slurry, and adjusting the grouting parameters of the indicator slurry in real time, so that the grouting filling position and the filling amount can be mastered in real time, and accurate basis is provided for observing the grouting reinforcement effect and adjusting the grouting parameters. According to the device, the flow position, the range and the depth of the indicator slurry with the indicating function are directly detected through the ground penetrating radar, so that the grouting filling position and the filling amount can be mastered in real time, accurate basis is provided for observing the grouting reinforcement effect and adjusting grouting parameters, and errors caused by changes of grouting pressure in the grouting process are avoided.
Drawings
Fig. 1 is a schematic flow chart of a method for detecting a reinforcing effect of shield tunnel grouting according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of equipment used in a method for detecting a shield tunnel grouting reinforcement effect according to an embodiment of the present invention.
In all the figures, the same reference numerals denote the same features, in particular: 1-pipe piece, 2-grouting hole, 3-ground penetrating radar and 4-main machine.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the invention provides a method for detecting the reinforcement effect of shield tunnel wall post-grouting, which comprises the following steps:
step one, indicator slurry with an indicating function is prepared. The method comprises the following steps: before the synchronous grouting of the shield tunnel, the slurry indicator is mixed into the slurry according to a preset proportion and uniformly stirred, and the indicator slurry with the indicating function is prepared. The slurry indicator is preferably a mineral substance such as iron chips or iron powder, and preferably a metal substance. The conductive paste has the characteristics of good conductivity, strong reflection effect on electromagnetic waves, low cost, easiness in obtaining, no abnormal influence on mechanical properties and reinforcing properties of slurry, no increase in pollution to underground environment and the like. Before the slurry indicator is mixed into the slurry according to a preset proportion, the slurry indicator needs to be ball-milled to a specified particle size so as to meet the performance requirement of the shield tunnel wall post-grouting slurry.
And step two, in the construction process of the shield tunnel, injecting indicator slurry into the wall of the shield tunnel from different positions through the reserved grouting holes on the segments, namely, performing synchronous grouting.
And step three, detecting the distribution and filling condition of the indicator slurry by using the ground penetrating radar. During synchronous grouting, indicator slurry behind the shield tunnel wall flows to the defect or the cavity, meanwhile, the distribution and the filling condition of the indicator slurry are detected by adopting the ground penetrating radar, and the flowing position, the range and the depth of the indicator slurry are obtained according to the detected data of the distribution and the filling condition of the indicator slurry, so that the grouting reinforcement effect of the defect position is mastered, and the grouting operation is guided to be performed better. Preferably, the ground penetrating radar can convert the distribution and filling condition of the indicator slurry into pictures to obtain a real-time and visual distribution and filling condition picture of the indicator slurry, so as to obtain the flowing position, range and depth of the indicator slurry, grasp the grouting reinforcement effect of the defect position and better guide the grouting operation.
The distribution and filling condition of the indicator slurry are detected by using the ground penetrating radar specifically as follows:
firstly, flow position and distribution data of slurry indicators in indicator slurry are detected and collected by using a ground penetrating radar. Detecting and collecting reflected signals of a slurry indicator in indicator slurry at the Ti moment and the Ti +1 moment by using a ground penetrating radar, wherein i is more than or equal to 0; acquiring distribution images of the slurry indicators in the indicator slurry at the Ti moment and the Ti +1 moment according to the reflection signals of the slurry indicators in the indicator slurry at the Ti moment and the Ti +1 moment; and comparing the distribution images of the slurry indicator in the indicator slurry at the Ti moment and the Ti +1 moment to obtain the flowing position and distribution data of the slurry indicator in the indicator slurry.
Then, the flow position, range and depth of the indicator slurry are obtained according to the flow position and distribution data of the slurry indicator in the indicator slurry.
The method comprises the following steps of:
first, the reflected signal of the slurry indicator in the indicator slurry is converted into a sampling pattern having a plurality of discrete points.
Then, the image global contour features of the sampling diagram are extracted to obtain a distribution image of the slurry indicator in the indicator slurry.
And step four, judging the grouting reinforcement effect of the rear defect position of the shield tunnel wall according to the flowing position, range and depth of the indicator grout, completing synchronous grouting if the grouting reinforcement effect is met, and entering step five, otherwise, adjusting the grouting parameters of the indicator grout according to the flowing position, range and depth of the indicator grout to continue grouting, namely entering step two until the grouting reinforcement effect is met, completing synchronous grouting, and entering step five. According to the flowing position, the range and the depth of the indicator grout, or the distribution and the filling condition map of the indicator grout, the grouting reinforcement effect of the rear defect position of the shield tunnel wall is judged, detection personnel communicate with related workers in time, and the grouting parameters of the indicator grout are adjusted in real time, so that the grouting filling position and the filling amount can be mastered in real time, accurate basis is provided for observing the grouting reinforcement effect and adjusting the grouting parameters, and the optimal grouting effect is obtained.
And fifthly, integrally detecting all the pipe pieces in the synchronous grouting range by using the ground penetrating radar, judging whether the reinforcing effect of the shield tunnel wall back grouting meets the requirement or not according to the integral detection result, stopping grouting if the reinforcing effect of the shield tunnel wall back grouting meets the requirement, and otherwise, performing secondary grouting on the defect part which does not meet the reinforcing effect of the shield tunnel wall back grouting until the reinforcing effect of the shield tunnel wall back grouting meets the requirement.
As shown in fig. 2, in the embodiment of the present invention, a segment 1 is an innermost barrier of a shield tunnel, and a plurality of grouting holes 2 are reserved on the segment 1. In the shield tunnel construction process, the grouting holes 2 are reserved through the pipe pieces for grouting behind the shield tunnel wall, so that the properties of rock and soil behind the tunnel are reinforced and improved, and the processing safety of the tunnel is guaranteed. Before the shield tunnel is synchronously grouted, the slurry indicator is mixed into the slurry and uniformly stirred. The slurry indicator is preferably iron chips, iron powder or other mineral substances, has good conductivity, strong reflection effect on electromagnetic waves, low cost and easy acquisition, does not have abnormal influence on the mechanical property and the reinforcing property of the slurry, and does not increase the pollution of the underground environment.
The device for detecting comprises a ground penetrating radar 3 and a supporting component for supporting the ground penetrating radar and providing motion power in the detection process of the ground penetrating radar. The ground penetrating radar 3 comprises a host 4, a transmitter, a transmitting antenna, a receiver and a receiving antenna. The host machine is a data acquisition and data processing system and is used for sending a control command to the transmitter and the receiver according to the command, the transmitter transmits electromagnetic waves to the underground according to the command of the host machine, the receiver starts data acquisition according to the control command and converts a received reflected signal of the indicator into a digital signal to be transmitted to the host machine 4, and the host machine 4 transmits the digital signal to the receiver according to the TiTime and Ti+1Construction of T from the reflected signal of the slurry indicator in the time indicator slurryiTime and Ti+1An image of the distribution of slurry indicator in the time of day indicator slurry. When constructing a distribution image of the slurry indicator, firstly, converting a reflected signal of the slurry indicator in the indicator slurry into a sampling graph with a plurality of discrete points; then, the image global contour features of the sampling diagram are extracted to obtain a distribution image of the slurry indicator in the indicator slurry. The host 4 is also used for connecting TiTime and Ti+1And comparing the distribution images of the slurry indicators in the indicator slurry at the moment to acquire the flowing position and distribution data of the slurry indicators in the indicator slurry. The flow position, range and depth of the iron chips or iron powder are displayed on the host machine 4, so that the grouting reinforcement effect of the defect position is mastered, and the grouting operation is guided better.
The method utilizes the matching use of the slurry added with iron chips or iron powder and the ground penetrating radar electromagnetic wave detection method, and can not only grasp the specific flowing position of the grouting slurry in real time, but also control the grouting amount of the defect position through the change of the image on the radar output screen, so that the optimal grouting reinforcement effect is achieved. Meanwhile, the ground penetrating radar detection is a rapid nondestructive detection method, and is beneficial to timely finding and rapidly responding to problems such as grouting effect in construction.
The material required by the method for detecting the reinforcement effect of the shield tunnel wall post-grouting is a slurry indicator, namely scrap iron or iron powder, and the required device comprises ground penetrating radar detection equipment. Before the shield tunnel is synchronously grouted, mixing iron chips or iron powder into the grout and uniformly stirring; grouting the shield tunnel wall through the grouting holes reserved in the segments to reinforce and improve the rock and soil properties at the back of the tunnel; synchronously detecting the distribution condition of the grout around the grouting holes by using a ground penetrating radar, and grasping the flowing change of the grout and the grout filling condition of the defect position by observing images on a radar host; according to the image change condition, the detection personnel and the related working personnel communicate in time, and the grouting pressure, the grouting position and the grouting amount are adjusted; after grouting is completed, using a ground penetrating radar to integrally detect all the duct pieces in the grouting range, searching the position of which the grouting effect does not meet the requirement according to the detection result, performing secondary grouting, and finally achieving the best grouting effect. The invention avoids the error caused by the change of the grouting pressure in the grouting process.
The specific working flow of the shield tunnel wall post-grouting reinforcement effect detection method is as follows:
(1) after the shield tunnel segment is installed and before synchronous grouting is applied, iron chips or iron powder are mixed into the slurry according to a certain proportion and uniformly stirred to obtain indicator slurry with an indicating function;
(2) after the shield tail duct pieces are assembled, synchronous grouting is respectively carried out on the shield tunnel wall from different positions through grouting holes reserved in the duct pieces;
(3) in the synchronous grouting process, a ground penetrating radar is utilized to timely detect the distribution condition of grout around a grouting hole, and the flow change of indicator grout and the grout filling condition of a defect position are mastered by observing images on a host;
(4) according to the real-time detection result of the ground penetrating radar, the grouting pressure, the grouting position and the grouting amount are adjusted so as to achieve a better grouting effect;
(5) and (4) after synchronous grouting is completed, integrally detecting all the duct pieces in the grouting range by using a ground penetrating radar, searching the position of which the grouting effect does not meet the requirement according to the detection result, repeating the step (4), performing secondary grouting, and finally achieving the best grouting effect.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The method for detecting the reinforcement effect of the shield tunnel through the post grouting is characterized by comprising the following steps of:
s1, in the process of shield tunnel construction, indicator slurry is injected into the back of the shield tunnel wall through a grouting hole reserved on a segment;
s2 detecting the flowing position, range and depth of the indicator slurry by using the ground penetrating radar;
s3, judging the grouting reinforcement effect of the rear defect position of the shield tunnel wall according to the flowing position, range and depth of the indicator grout, if the grouting reinforcement effect is met, completing synchronous grouting, and entering step S4, otherwise, adjusting the grouting parameters of the indicator grout according to the flowing position, range and depth of the indicator grout, returning to step S1 until the grouting reinforcement effect is met, completing synchronous grouting, and entering step S4;
s4, integrally detecting all the segments in the synchronous grouting range by using the ground penetrating radar, judging whether the reinforcing effect of the shield tunnel wall back grouting meets the requirement or not according to the integral detection result, stopping grouting if the reinforcing effect of the shield tunnel wall back grouting meets the requirement, and otherwise, performing secondary grouting on the defect part which does not meet the reinforcing effect of the shield tunnel wall back grouting until the reinforcing effect of the shield tunnel wall back grouting meets the requirement.
2. The method for detecting the effect of the shield tunnel backfill grouting reinforcement according to claim 1, wherein the step S1 further comprises the following steps:
and mixing the slurry indicator into the slurry according to a preset proportion, and uniformly stirring to prepare the indicator slurry with the indicating function.
3. The method for detecting the effect of the shield tunnel backfill grouting reinforcement according to claim 1, wherein the grout indicator is a metallic substance.
4. The method for detecting the effect of the shield tunnel grouting reinforcement according to claim 3, wherein the slurry indicator is scrap iron or iron powder.
5. The method for detecting the effect of the shield tunnel backfill grouting reinforcement according to claim 1, wherein the step S2 further comprises the following steps:
s21, detecting and collecting the flowing position and distribution data of the slurry indicator in the indicator slurry by using a ground penetrating radar;
s22 obtains the flow position, range and depth of the indicator slurry according to the flow position and distribution data of the slurry indicator in the indicator slurry.
6. The method for detecting the effect of the shield tunnel backfill grouting reinforcement according to claim 5, wherein the step S21 further comprises the following steps:
s211, detecting and collecting T by using ground penetrating radariTime and Ti+1The reflected signal of the slurry indicator in the slurry of the time indicator, wherein i is more than or equal to 0;
s212 is according to TiTime and Ti+1Obtaining T from the reflected signal of the slurry indicator in the slurry of the time indicatoriTime and Ti+1A distribution image of the slurry indicator in the time indicator slurry;
s213 converting TiTime and Ti+1And comparing the distribution images of the slurry indicators in the indicator slurry at the moment to acquire the flowing position and distribution data of the slurry indicators in the indicator slurry.
7. The method for detecting the effect of the shield tunnel grouting reinforcement according to claim 6, wherein the step S212 of obtaining the distribution image of the grout indicator in the indicator grout comprises the following steps:
firstly, converting a reflected signal of a slurry indicator in indicator slurry into a sampling chart with a plurality of discrete points;
then, the image global contour features of the sampling diagram are extracted to obtain a distribution image of the slurry indicator in the indicator slurry.
8. The method for detecting the effect of reinforcing the shield tunnel by means of the back grouting according to claim 1, wherein in step S4, the step of performing the secondary grouting on the defective portion which does not satisfy the effect of reinforcing the shield tunnel by means of the back grouting specifically comprises the following steps:
s41, positioning the defect part according to the overall detection result and determining the position of the defect part;
s42, injecting indicator slurry into the defect part according to the position of the defect part, and executing the step S2 and the step S3 until the shield tunnel wall post-grouting reinforcement effect meets the requirement.
9. An apparatus for use in the detection method of any one of claims 1-8, comprising a ground penetrating radar and a support assembly;
the ground penetrating radar is used for detecting the flowing position, range and depth of the indicator slurry when the indicator slurry is injected into the rear of the shield tunnel wall through the reserved grouting hole in the duct piece, and judging the grouting reinforcement effect of the rear defect position of the shield tunnel wall according to the flowing position, range and depth of the indicator slurry;
the supporting component is used for supporting the ground penetrating radar and providing motion power in the detection process of the ground penetrating radar.
10. The apparatus of claim 9, wherein the ground penetrating radar comprises a host, a transmitter, a transmitting antenna, a receiver, and a receiving antenna, wherein,
the host is used for sending a control command to the transmitter and the receiver, the transmitter transmits electromagnetic waves to the underground according to the command of the host, the receiver starts data acquisition according to the control command and converts a received reflected signal of the indicator into a digital signal to be transmitted to the host, the host constructs a distribution image of the slurry indicator in the slurry indicator according to the digital signal, so that the flowing position, the flowing range and the flowing depth of the slurry indicator are obtained, and the grouting reinforcement effect of the rear defect position of the shield tunnel wall is judged according to the flowing position, the flowing range and the flowing depth of the slurry indicator.
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