CN112227944A - Dewatering well construction process applied to tunnel construction - Google Patents
Dewatering well construction process applied to tunnel construction Download PDFInfo
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- CN112227944A CN112227944A CN202010897420.XA CN202010897420A CN112227944A CN 112227944 A CN112227944 A CN 112227944A CN 202010897420 A CN202010897420 A CN 202010897420A CN 112227944 A CN112227944 A CN 112227944A
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- 238000010276 construction Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000005553 drilling Methods 0.000 claims abstract description 28
- 239000004576 sand Substances 0.000 claims abstract description 24
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 238000011010 flushing procedure Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims 1
- 239000002002 slurry Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- -1 sandstone Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a dewatering well construction process applied to tunnel construction, which comprises the following steps: positioning a drilling machine; well completion construction; washing a well and pumping water; installing and fixing a water pump; the water inflow and sand content were checked. The drill positioning comprises: the dewatering well drilling machine stably positions the drilling machine according to the well mouth position after lofting, so that the verticality of a dewatering well in the construction process is ensured; the well construction comprises the following steps: the drilling machine adopts a 180mm drill bit, the aperture error is 0 to +20mm, the verticality of the water well is measured for 1 time every 20m, the verticality is controlled to be less than 1%, a 220mm steel protective cylinder is arranged in the range of 6-9 m below the ground to prevent hole collapse, and a bare hole is arranged below the steel protective cylinder. The dewatering well construction process applied to tunnel construction can effectively improve the well construction efficiency and the well success rate.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a dewatering well construction process applied to tunnel construction.
Background
The Longnan tunnel is located in the Henan county and the Longnan county in Ganzhou city, Jiangxi province, and the route is near to the north and the North. The tunnel has a full length of 10240m and the beginning-to-end distance is DK91+530 to DK101+ 770.225. The tunnel site area mainly takes low mountains of denudation structures, has fluctuated topography, local steep slopes, narrow and long gullies and is mostly in a V shape, and the ground elevation along the line is 210-860 m, which belongs to the appearance of the low mountains.
The tunnel site area develops and degenerates stratums such as sandstone, granite, sandstone, quartz sandstone and the like, and penetrates eleven faults such as F1-F11, wherein the F8 fault belongs to a typical water-rich fault and has high pressure bearing property. The geological structure and hydrogeological conditions of the tunnel are complex, the tunnel belongs to a controlled key tunnel project, and the maximum burial depth is about 580 m. The F8 fault is a geophysical exploration revealed fault, the influence bandwidth of the fault is estimated to be about 120m, the fault is generated in a mud basin system (D2l) sandstone stratum at the place near DK99+600 when the earth surface and a tunnel intersect, the dip angle is about 81 degrees, and the fault is estimated to be small.
According to the early geological exploration data, preliminarily judging that the permeability coefficient of rock mass in the fault fracture influence zone of the tunnel body F8 is 0.017-0.022 m/d, and taking 20m/d of stratum permeability coefficient according to gravel soil in consideration of the fact that the tunnel can encounter large water gushing in construction.
The F8 fault is located at DK99+ 500-DK 99+620, a surface water system of a field develops, mainly supplies atmospheric rainfall and mountain stream ditch water, is obviously influenced by seasonality and changes, and underground water is bedrock structure fracture water and is not erosive. Revealing by drilling: the fault zone is in the shape of sand and block stone, below the fault, a limestone interlayer is disclosed, the fault is rich in confined water, and water gushes from a drilling orificeThe height of the water column is about 2m, the estimated water pressure of the hole body is 0.5Mpa, wherein the predicted maximum water inflow per linear meter of DK99+ 500-DK 99+620 sections is 49.98m3D, water inflow per day is about 5998.04m3And in the strong water-rich area, geological disasters such as collapse, water burst and mud burst which are easy to occur in the tunnel construction of the section are predicted. In conclusion, F8 fault fracture zone hydrogeological conditions are poor.
The traditional dewatering well construction process faces the complex geological conditions of the Longnan tunnel, so that the well forming difficulty is high, the construction efficiency is low, and the well forming success rate is low.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a dewatering well construction process applied to tunnel construction, can effectively improve the well construction efficiency and the well success rate, and can effectively solve the problems in the background art.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a dewatering well construction process applied to tunnel construction, which comprises the following steps:
s1: positioning a drilling machine;
s2: well completion construction;
s3: washing a well and pumping water;
s4: installing and fixing a water pump;
s5: the water inflow and sand content were checked.
As a preferable solution, the positioning of the drilling machine in the step S1 includes:
the dewatering well drilling machine stably positions the drilling machine according to the well mouth position after lofting, so that the verticality of the dewatering well in the construction process is ensured.
As a preferable scheme, the well construction in the step S2 includes:
the drilling machine adopts a 180mm drill bit, the aperture error is 0 to +20mm, the verticality of the water well is measured for 1 time every 20m, the verticality is controlled to be less than 1%, a 220mm steel protective cylinder is arranged in the range of 6-9 m below the ground to prevent hole collapse, and a bare hole is arranged below the steel protective cylinder.
As a preferable scheme, the drilling depth is 10m below the designed tunnel, and the drilling depth is filled with medium sand within 3m on the bottom of the well for filtering sediments and silt.
As a preferable scheme, the well flushing and water pumping in the step S3 includes:
after the dewatering well is formed into a hole, an isolation plug is adopted to carry out well washing construction in 24 hours in time, if the sand content in the well is large, slag is fished first, then the well is washed, and when the conventional well washing effect is not good, a well washing agent can be adopted to soak the well, and then the well is washed;
and simultaneously controlling the sand content of pumped water: the coarse sand content is less than 1/50000, the medium sand content is less than 1/20000, the fine sand content is less than 1/10000, and the lift and water pumping amount of a water pumping pump are greater than the water inflow amount in a well.
As a preferable scheme, the positioning of the drilling machine in the step S1 further comprises:
and (4) measuring the well position according to the plane layout diagram of the downcomer well, and marking after the well position measurement is finished.
As a preferable scheme, the positioning of the drilling machine in the step S1 further comprises:
for underground obstacles in a field, hole site obstacle removal treatment is carried out before construction according to the construction condition.
As a preferable scheme, the hole site obstacle removing treatment comprises:
if the ground obstacles are not easy to clear or are influenced by other construction conditions and the well can not be dug at the original well position, the ground obstacles should be communicated with engineers and the first party in time and take other measures, and the well position can be properly adjusted if necessary.
Preferably, the dewatering well has a diameter of 200mm and is arranged outside the tunnel main body structure, and the center of the dewatering well is not less than 5.45m away from the outside of the tunnel main body structure. The longitudinal horizontal spacing was 10 m.
One or more technical schemes provided by the invention at least have the following technical effects or advantages:
through adopting the rig location, well construction, well washing, drawing water, installation fixed water pump and inspection gush water volume and sand content, can effectively improve well construction efficiency and well success rate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic plan view of an F8 precipitation well in a precipitation well construction process applied to tunnel construction in the embodiment of the invention.
FIG. 2 is a schematic longitudinal section view of a F8 dewatering well applied to a dewatering well construction process for tunnel construction in the embodiment of the invention.
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.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
For better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the present invention.
Example (b):
referring to fig. 1-2, the present embodiment provides a dewatering well construction process applied to tunnel construction, including the following steps:
s1: positioning a drilling machine, enabling the drilling machine to be stably in place according to the well head position which is well laid out, measuring and laying the well position according to a well plane layout diagram during the construction process, marking after the well position measurement is finished, carrying out hole position obstacle clearing treatment on underground obstacles existing in a field according to the construction condition before construction, if the ground obstacles are not easy to clear or influenced by other construction conditions, and cannot carry out well drilling at the well position which is originally laid, timely communicating with an engineer and a first party and taking other measures, and if necessary, properly adjusting the well position;
s2: constructing a well, wherein a drilling machine adopts a 180mm drill bit, the aperture error is 0 to +20mm, the verticality of the water well is measured 1 time per 20m, the verticality is controlled to be less than 1%, a 220mm steel protective cylinder is arranged in the range of 6-9 m below the ground to prevent hole collapse, a bare hole is arranged below the steel protective cylinder, the drilling depth is 10m below a designed tunnel, and the range of 3m above the bottom of the well is filled with medium sand for filtering sediment and sludge;
s3: after well flushing, water pumping and pore forming of a dewatering well, timely performing well flushing construction by using an isolation plug within 24 hours, if the sand content in the well is large, firstly dredging slag and then flushing the well, and when the conventional well flushing effect is not good, soaking by using a well flushing agent and then flushing the well;
and simultaneously controlling the sand content of pumped water: the coarse sand content is less than 1/50000, the medium sand content is less than 1/20000, the fine sand content is less than 1/10000, and the lift and the water pumping amount of a water pumping pump are more than the water inflow amount in a well;
s4: installing and fixing a water pump;
s5: and (4) checking the water inflow and the sand content, wherein the diameter of the dewatering well is 200mm, the dewatering well is arranged outside the main structure of the tunnel, and the center is not less than 5.45m away from the outside of the structure. The longitudinal horizontal spacing was 10 m.
When the local hole collapse phenomenon occurs in the well forming process, the rock-soil layer is broken and the structure is loose, the wall protection effect of slurry (designed specific gravity) in the hole cannot meet the wall protection requirement, and the specific gravity of the slurry is increased by adopting an artificial slurry making method. The phenomena of hole deviation, cavities, hole collapse and the like occur for many times in the process of punching the front and the back three well positions to form holes, so that the drilling is dropped, the drilling is blocked, and the hole forming fails. And then, the hole forming mode is changed into a motor-pumped well hole forming mode with the diameter of 22cm for successfully forming 6 holes.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a be applied to tunnel construction's precipitation well construction technology which characterized in that: the method comprises the following steps:
s1: positioning a drilling machine;
s2: well completion construction;
s3: washing a well and pumping water;
s4: installing and fixing a water pump;
s5: the water inflow and sand content were checked.
2. The dewatering well construction process applied to tunnel construction as claimed in claim 1, wherein: the drill positioning in step S1 includes:
the dewatering well drilling machine stably positions the drilling machine according to the well mouth position after lofting, so that the verticality of the dewatering well in the construction process is ensured.
3. The dewatering well construction process applied to tunnel construction as claimed in claim 2, wherein: the well completion construction in step S2 includes:
the drilling machine adopts a 180mm drill bit, the aperture error is 0 to +20mm, the verticality of the water well is measured for 1 time every 20m, the verticality is controlled to be less than 1%, a 220mm steel protective cylinder is arranged in the range of 6-9 m below the ground to prevent hole collapse, and a bare hole is arranged below the steel protective cylinder.
4. The dewatering well construction process applied to tunnel construction as claimed in claim 3, wherein: the depth of the drilled hole is 10m below the designed tunnel, and the range of 3m above the bottom of the well is filled with medium sand for filtering sediment and sludge.
5. The dewatering well construction process applied to tunnel construction as claimed in claim 4, wherein: the well flushing and water pumping in the step S3 comprises the following steps:
after the dewatering well is formed into a hole, an isolation plug is adopted to carry out well washing construction in 24 hours in time, if the sand content in the well is large, slag is fished first, then the well is washed, and when the conventional well washing effect is not good, a well washing agent can be adopted to soak the well, and then the well is washed;
and simultaneously controlling the sand content of pumped water: the coarse sand content is less than 1/50000, the medium sand content is less than 1/20000, the fine sand content is less than 1/10000, and the lift and water pumping amount of a water pumping pump are greater than the water inflow amount in a well.
6. The dewatering well construction process applied to tunnel construction as claimed in claim 1, wherein: the positioning of the drilling machine in step S1 further includes:
and (4) measuring the well position according to the plane layout diagram of the downcomer well, and marking after the well position measurement is finished.
7. The dewatering well construction process applied to tunnel construction as claimed in claim 6, wherein: the positioning of the drilling machine in step S1 further includes:
for underground obstacles in a field, hole site obstacle removal treatment is carried out before construction according to the construction condition.
8. The dewatering well construction process applied to tunnel construction as claimed in claim 7, wherein: the hole site obstacle clearance treatment comprises the following steps:
if the ground obstacles are not easy to clear or are influenced by other construction conditions and the well can not be dug at the original well position, the ground obstacles should be communicated with engineers and the first party in time and take other measures, and the well position can be properly adjusted if necessary.
9. The dewatering well construction process applied to tunnel construction according to any one of claims 1 to 8, wherein: the diameter of the dewatering well is 200mm, the dewatering well is arranged on the outer side of the main structure of the tunnel, and the distance between the center of the dewatering well and the outer side of the main structure of the tunnel is not less than 5.45 m. The longitudinal horizontal spacing was 10 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010897420.XA CN112227944A (en) | 2020-08-31 | 2020-08-31 | Dewatering well construction process applied to tunnel construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010897420.XA CN112227944A (en) | 2020-08-31 | 2020-08-31 | Dewatering well construction process applied to tunnel construction |
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| CN112227944A true CN112227944A (en) | 2021-01-15 |
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| CN202010897420.XA Pending CN112227944A (en) | 2020-08-31 | 2020-08-31 | Dewatering well construction process applied to tunnel construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114517639A (en) * | 2022-01-24 | 2022-05-20 | 厦门中建东北设计院有限公司 | Method for exploring rockfill and gravel soil field |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3703534A1 (en) * | 1987-02-06 | 1988-08-25 | Bilfinger Berger Bau | Method for producing a well |
| CN109339080A (en) * | 2018-11-09 | 2019-02-15 | 中铁二十二局集团轨道工程有限公司 | A kind of open-cut foundation ditch deep slob region vacuum precipitation system and construction method |
| CN109723384A (en) * | 2019-01-29 | 2019-05-07 | 中国建筑第七工程局有限公司 | With pipe at well dewatering construction engineering method |
| CN111139852A (en) * | 2020-01-07 | 2020-05-12 | 中交一公局第三工程有限公司 | Water-rich sandy gravel stratum high-permeability ultra-deep foundation pit dewatering construction method |
-
2020
- 2020-08-31 CN CN202010897420.XA patent/CN112227944A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3703534A1 (en) * | 1987-02-06 | 1988-08-25 | Bilfinger Berger Bau | Method for producing a well |
| CN109339080A (en) * | 2018-11-09 | 2019-02-15 | 中铁二十二局集团轨道工程有限公司 | A kind of open-cut foundation ditch deep slob region vacuum precipitation system and construction method |
| CN109723384A (en) * | 2019-01-29 | 2019-05-07 | 中国建筑第七工程局有限公司 | With pipe at well dewatering construction engineering method |
| CN111139852A (en) * | 2020-01-07 | 2020-05-12 | 中交一公局第三工程有限公司 | Water-rich sandy gravel stratum high-permeability ultra-deep foundation pit dewatering construction method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114517639A (en) * | 2022-01-24 | 2022-05-20 | 厦门中建东北设计院有限公司 | Method for exploring rockfill and gravel soil field |
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