CN111456762A - Karez tunnel reinforcing method for borehole wall drilling grouting and local seepage prevention of underdrain - Google Patents
Karez tunnel reinforcing method for borehole wall drilling grouting and local seepage prevention of underdrain Download PDFInfo
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- CN111456762A CN111456762A CN202010275303.XA CN202010275303A CN111456762A CN 111456762 A CN111456762 A CN 111456762A CN 202010275303 A CN202010275303 A CN 202010275303A CN 111456762 A CN111456762 A CN 111456762A
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- karez
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
- E03B3/15—Keeping wells in good condition, e.g. by cleaning, repairing, regenerating; Maintaining or enlarging the capacity of wells or water-bearing layers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The invention belongs to the field of protection of karez, and discloses a karez tunnel reinforcing method for borehole wall drilling grouting and local seepage prevention of an underdrain, which comprises the following steps; establishing a dry soil construction environment in the karez tunnel, and cleaning sundries and deficient soil of a well wall of the karez tunnel; arranging an anti-seepage section in the karez tunnel, wherein the anti-seepage section can enable the water content of soil at the bottom of the well wall of the negative temperature section of the karez tunnel to be lower than the initial frost heaving water content; presetting a drilling area on the wall of a karez well, forming a plurality of grouting holes on the drilling area, and injecting a potassium silicate solution into the drilling area through the grouting holes until the content of potassium silicate in soil in the drilling area is greater than a preset value; mixing potassium silicate with soil to obtain mixed soil, and backfilling the mixed soil to block the grouting holes. The method has the characteristics of simple operation, low cost and no change of the original historical appearance of the karez, and the potassium silicate is used for reinforcing the soil body of the karez, so that the strength, frost heaviness resistance and wind erosion, stripping and damage resistance of the soil body are greatly improved.
Description
Technical Field
The invention belongs to the field of protection of karez, and relates to a karez tunnel reinforcing method for borehole wall drilling grouting and local seepage prevention of an underdrain.
Background
The karez has the history of nearly 3000 years as an important water diversion project in arid regions, is called ancient three projects of China together with the great wall of the great wall and the great canal of the Hangzhou in the Jing, is an important historical cultural heritage, and plays an irreplaceable role in human drinking water storage, agricultural irrigation, ecological protection, oasis culture and the like till now.
Freeze thawing of the wall of the karez tunnel is peeled off, the tunnel rise ratio is changed, the structural stability is reduced, collapse damage is often caused, the peeled and collapsed soil blocks an underdrain, the water yield is reduced, and the clearing amount of dredging and dredging is increased. The freeze-thaw spalling of the well wall is the initial form and the root cause of collapse damage, and in order to ensure the stability of the well wall, four strengthening schemes are mainly adopted at present: the first scheme is as follows: referring to fig. 1, the precast concrete plate protection scheme uses two precast concrete plates with different sizes to be spliced into a protection frame for supporting and reinforcing. Scheme II: referring to fig. 2, the method of the urban door type masonry arch support uses masonry lining support, and the appearance of the method is similar to that of an urban door. Generally, the materials can be obtained locally. The third scheme is as follows: referring to fig. 3, the oval concrete culvert method, which uses concrete to form concrete culverts having a cross-section like an egg. In order to prevent the positions of two adjacent concrete culvert pipes from changing, grooves and lugs are alternately arranged on two sides and below the concrete culvert pipes respectively for splicing, and reinforcing meshes are arranged in the concrete culvert pipes. And the scheme is as follows: referring to fig. 4, the anchor rod hanging geogrid is reinforced by spraying/smearing concrete, in the scheme, anchor rods are used for reinforcing soil on the wall and the top of an underground channel, a geogrid net is externally hung, and the channel bottom adopts a precast concrete channel for drainage.
However, the three previous schemes require a large amount of supporting materials to be transported, but the tunnel is narrow in space and different in section shape, and the materials are difficult to transport and difficult to construct; the fourth proposal has reduced working strength, but complex working procedures and difficult construction. The four schemes have long construction period and high construction cost, do not consider the mechanism of stripping and damage of the karez wall, change the historical original appearance of the karez, do not conform to the cultural relic protection principle of 'repairing old as old', and are not suitable for large-area popularization.
Disclosure of Invention
The invention aims to overcome the defects of long construction period, high manufacturing cost and high construction difficulty of the existing karez tunnel reinforcing scheme in the prior art, and provides a karez tunnel reinforcing method for borehole wall drilling grouting and local seepage prevention of an underdrain.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for reinforcing a karez tunnel with borehole wall drilling grouting and local seepage prevention of an underdrain comprises the following steps;
s1: establishing a dry soil construction environment in the karez tunnel, and cleaning sundries and deficient soil of a well wall of the karez tunnel;
s2: arranging an anti-seepage section in the karez tunnel, wherein the anti-seepage section can enable the water content of soil at the bottom of the well wall of the negative temperature section of the karez tunnel to be lower than the initial frost heaving water content;
s3: presetting a drilling area on the wall of a karez well, forming a plurality of grouting holes on the drilling area, and injecting a potassium silicate solution into the drilling area through the grouting holes until the content of potassium silicate in soil in the drilling area is greater than a preset value;
s4: mixing potassium silicate with soil to obtain mixed soil, and backfilling the mixed soil to block the grouting holes.
The invention further improves the following steps:
the specific method of S1 is as follows:
arranging a water interception dam at a position 12-14 m inward of a closure opening of the karez tunnel, leading water to an open channel at a position 6-7 m outward of the closure opening through a water pump, and establishing a dry soil construction environment; and (5) cleaning sundries and deficient soil of the wall of the karez tunnel.
The specific method of S2 is as follows:
setting the area of 0.78-0.90 m outside the closure mouth of the karez tunnel and 10.62-11.50 m inside the closure mouth as an area to be provided with an anti-seepage section, laying a lime-soil cushion layer in the area to be provided with the anti-seepage section and tamping the lime-soil cushion layer, setting the lime-soil cushion layer into a U-shaped groove structure, and laying two films and a U-shaped concrete lining plate above the lime-soil cushion layer in sequence to complete the setting of the anti-seepage section.
The thickness of the lime soil cushion layer is 0.1-0.2 m.
The U-shaped concrete lining board is made of concrete with the grade of C20 or above.
The specific method of S3 is as follows:
setting a region below 0.4-0.5 m on the wall of a karst well with a downward opening of 10.62-11.50 m of the karst well tunnel as a drilling region, drilling holes in the drilling region in a downward inclined manner, forming a plurality of grouting holes, plugging the grouting holes by using a grout stop plug, filling a potassium silicate solution into a dropping bucket, connecting the grout stop plug through a liquid conveying pipe, injecting the potassium silicate solution into the grouting holes for infiltration until the content of potassium silicate in soil in the drilling region is greater than a preset value, and taking out the grout stop plug.
The mass concentration of the potassium silicate solution is 10-12%, wherein the potassium silicate is high-modulus potassium silicate with the modulus of 3.3; the preset value is 3%.
The length of the grouting hole is 0.5-0.6 m, and the aperture is 0.02-0.03 m; the included angle between the grouting holes and the horizontal plane is 5-15 degrees.
The plurality of grouting holes are uniformly arranged, and the distance between every two adjacent grouting holes is 0.18-0.20 m.
The mass content of potassium silicate in the mixed soil in the S4 is more than 3%, and when the mixed soil is used for backfilling and sealing the grouting holes in the S4, the backfilling density is more than or equal to 1.51g/cm3。
Compared with the prior art, the invention has the following beneficial effects:
the seepage-proofing section is arranged in the karez tunnel, so that the water content of soil at the bottom of the well wall of the negative temperature section of the karez tunnel is lower than the initial frost heaving water content, and frost heaving damage to the well wall soil is effectively prevented; meanwhile, considering the mechanism of the karez well wall spalling damage, the karez well wall is provided with the grouting holes, and potassium silicate solution is injected through the grouting holes, so that the soil strength is greatly improved, and the spalling damage of the soil under freeze-thaw cycle and wind erosion is effectively reduced. Compared with the prior art, the method has the characteristics of simple operation, short construction period, low cost and no change of the historical original appearance of the karez, follows the cultural relic protection principle of 'old and useless', keeps the historical original appearance of the karez to the maximum extent, can be popularized in a large area, and ensures the agricultural production and domestic water of local residents.
Furthermore, the anti-seepage section is provided with a three-layer structure of a lime soil cushion layer, two cloth films and a U-shaped concrete lining plate, so that the water content of the soil body at the bottom of the well wall of the negative temperature depth section of the tunnel is lower than the initial frost heaving water content, namely, the soil body at the bottom of the well wall can not frost heaving.
Furthermore, the thickness of the lime soil cushion layer is 0.1-0.2 m, so that the strength and the water resistance of the open channel and the closed channel soil of the seepage-proofing section are effectively improved.
Furthermore, an area below 0.4-0.5 m on the wall of the karst well with the inward 10.62-11.50 m of the closure mouth of the karst well tunnel is set as a drilling area, the water content of the well wall soil at the position of 0.4-0.5 m of the area is the initial frost heaving water content height, and the potassium silicate solution is injected into the drilling hole to prevent the well wall soil from being damaged by frost heaving.
Further, the mass concentration of the potassium silicate solution is 10-12%, and the potassium silicate is high-modulus potassium silicate with the modulus of 3.3; the preset value is 3%, and the potassium silicate solution can enhance the water stability of the soil, improve the strength of the soil and play a role in preventing collapse.
Furthermore, the length of the grouting hole is 0.5-0.6 m, the aperture is 0.02-0.03 m, and the included angle between the grouting hole and the horizontal plane is 5-15 degrees, so that the potassium silicate solution is ensured to fully permeate into the soil on the side wall of the karez.
Furthermore, a grouting test shows that the potassium silicate has a remarkable percolation effect, the percolation range is in a bubble shape in a space curved surface, the maximum diameter of the percolation range is 20cm, the distance between every two adjacent grouting holes is set to be 0.18-0.20 m, the construction difficulty is reduced under the condition of ensuring the percolation requirement, and the cost is saved.
Further, the mass content of potassium silicate in the mixed soil is more than 3Percent, the backfill density of the mixed soil is more than or equal to 1.51g/cm3The original appearance of the side wall of the karst well is restored while the karst well tunnel is effectively reinforced, and the cultural relic protection principle of 'repairing old as old' is achieved.
Drawings
FIG. 1 is a schematic diagram of reinforcement of a first conventional solution;
FIG. 2 is a schematic diagram of reinforcement of a second conventional solution;
FIG. 3 is a schematic diagram of reinforcement of a third prior art solution;
FIG. 4 is a schematic illustration of reinforcement of a prior art solution four;
FIG. 5 is a schematic view of the arrangement of the karez seepage prevention section of the present invention;
FIG. 6 is a schematic view of a plan layout of a borehole wall of a karr well according to the present invention;
fig. 7 is a schematic view of the arrangement of the section of the borehole of the karr well wall of the invention.
Wherein: 1-flood dam; 2-open channel; 3-dragon mouth; 4-a vertical shaft; 5-underdrain; 6-grouting holes; 7-well wall; 8-U type concrete lining board; 9-two cloth films; 10-lime soil bedding course.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 5 to 7, the invention relates to a method for reinforcing a karez tunnel by drilling and grouting a well wall and local seepage prevention of an underdrain, which achieves the aim of reinforcing the well wall 7 by arranging a local seepage prevention section on the karez underdrain 5 and adopting a method of combining drilling and grouting potassium silicate solution in a certain range on the well wall 7.
The karst well generally comprises a waterlogging dam 1, an open channel 2, a closure gap 3, an underdrain 5 and a plurality of vertical shafts 4, wherein the waterlogging dam 1, the open channel 2, the closure gap 3 and the underdrain 5 are sequentially arranged along a karst well tunnel, and the vertical arrangement of the vertical shafts 4 is arranged on the karst well tunnel wall. The invention relates to a karez tunnel reinforcing method for borehole grouting of a well wall and local seepage prevention of an underdrain, which is characterized in that according to the failure mechanism of a karez well wall 7, a local seepage prevention section is arranged, and 3% of high-modulus potassium silicate solution is added into the well wall 7 to enhance the strength of the well wall 7, and the karez tunnel reinforcing method can be specifically divided into two parts, namely the local seepage prevention section of the underdrain 5 is arranged and borehole grouting is carried out on the well wall 7.
The device to be used comprises a water pump, two cloth membranes 9, a U-shaped concrete lining plate 8, an earth auger, a seepage slurry, a dropping bucket, a liquid conveying pipe and a slurry stop plug. The water pump is used for pumping water at the small-sized intercepting dam to ensure a dry soil construction environment, and the water pump with a corresponding model and specification is selected according to the actual flow of the underground canal 5 of the karez. The two cloth-one membranes 9 are made of impermeable materials for earthwork. The U-shaped concrete lining plates 8 are prefabricated members, and the U-shaped concrete lining plates 8 of various sizes are manufactured according to the actual flow of the karst well. The earth drill is used for drilling a grouting hole 6 in a karez well wall 7, and the specification of a drill bit meets the preset size of the grouting hole 6. The osmotic slurry is potassium silicate solution, and the potassium silicate solution with the mass concentration of 10-12% is prepared by adopting high-modulus potassium silicate with the modulus of 3.3 and tap water. The drip bucket is a common infusion bucket, the capacity is designed according to actual needs, and the capacity is selected to be larger than the volume of potassium silicate solution needed for ensuring that the content of potassium silicate in soil in a reinforcing range reaches 3%. The infusion tube is a common plastic infusion tube and needs to be matched with the drip bottle and the grout stop plug. The size of the grout stopping plug is selected according to the size of the grouting hole 6 and is used for plugging during grouting.
The arrangement of the local anti-seepage section of the underdrain specifically comprises the following steps:
1. a small water retaining dam is arranged. Set up small-size cut-off dam 12 ~ 14m depths in longkou 3, lead to the open channel 2 of 6 ~ 7m departments outside longkou 3 through the water pump with water, guarantee that 18 ~ 21m length range does not have the canal water inside and outside longkou 3, keep the dry soil construction environment.
2. And (5) cleaning impurities of the canal base and the deficient soil of the well wall 7. The method comprises the steps of cleaning sundries and a well wall 7 of an original karez channel, wherein the cleaning range is an area with the total length of 0.78-0.90 m outside a closure 3 and 10.62-11.50 m inside the closure 3 of 11.4-12.4 m, and an anti-seepage section is arranged in the area, and the anti-seepage section is designed according to the size scheme, so that the water content of a soil body at the bottom of the well wall 7 of a karez tunnel negative temperature section can be lower than the initial frost heaving water content, namely the soil body at the bottom of the well wall 7 can not be frost heaving.
3. The seepage-proofing section is designed in a concrete seepage-proofing way. And tamping the lime-soil cushion layer 10 at the anti-seepage section, wherein the thickness of the cushion layer is 0.1-0.2 m, making the lime-soil cushion layer 10 into a U-shaped groove, laying two pieces of anti-seepage cloth 9 on the upper part of the lime-soil cushion layer 10, welding the joint tightly, laying the prefabricated U-shaped concrete lining plate 8 on the upper part, and selecting the concrete grade of the U-shaped concrete lining plate 8 above C20.
The well wall drilling grouting method specifically comprises the following steps:
1. selecting high-modulus potassium silicate with the modulus of 3.3, and preparing the potassium silicate solution with the mass concentration of 10-12% by using tap water as osmotic slurry.
2. And putting the prepared penetrating slurry into a dropping bucket.
3. And determining a drilling area and drilling. In the depth range of 10.62-11.50 m in the closure 3, the area of the well wall 7 with the height below 0.4-0.5 m is a drilling area. Meanwhile, the potassium silicate is found to have a remarkable percolation effect through a grouting test, the percolation range is like a bubble shape in the shape of a space curved surface, the maximum diameter is 20cm, therefore, circular grouting holes 6 with the diameter of 2-3 cm are drilled downwards on the well wall 7 in a drilling area at the positions of 18cm at intervals of up, down, left and right by using an earth drill, the drilling depth is 50-60 cm, the included angle between the grouting holes 6 and the horizontal plane can be 5-15 degrees, the drilling depth is preset according to the measured value of the local multi-year surface freezing temperature, and the drilling depth is 50cm in the embodiment.
4. The grouting holes 6 are plugged by using a grout stop plug, the grout stop plug is connected with a liquid conveying pipe, and grouting infiltration is carried out by using a dropping bucket until the content of potassium silicate in the soil body in the drilling area reaches 3%.
5. After grouting is finished, screening a certain amount of surface-cleaning deficient soil of the karr well wall 7, mixing with high-modulus potassium silicate to obtain mixed soil, controlling the content of potassium silicate in the mixed soil to be 3%, backfilling and plugging the grouting hole 6 with the mixed soil, wherein the backfilling density is not less than 1.51g/cm3。
The method can effectively overcome the defects of the existing method, and a plurality of existing reinforcing methods are compared with the reinforcing method to illustrate the practical value of the method. See table 1.
TABLE 1 campwell strengthening method comparison
Compared with the prior art, the method for reinforcing the karez tunnel with the borehole wall drilling grouting and the partial seepage prevention of the underdrain has the advantages of simple operation, low cost and no change of the historical original appearance of the karez, can greatly improve the strength of the soil body, effectively reduce the peeling damage of the soil body under freeze-thaw cycle and wind erosion, reduce the water content of the soil body at the deep negative temperature section of the karez in winter of the karez well wall 7, prevent the frost heaving damage of the well wall 7 soil, is suitable for large-area popularization, protects the karez as a historical cultural relic, and ensures the agricultural production and domestic water of local residents.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A method for reinforcing a karez tunnel with borehole wall drilling grouting and local seepage prevention of an underdrain is characterized by comprising the following steps;
s1: establishing a dry soil construction environment in the karez tunnel, and cleaning sundries and deficient soil of a well wall of the karez tunnel;
s2: an anti-seepage section is arranged in the karez tunnel, and the anti-seepage section can enable the water content of soil at the bottom of a well wall (7) of a negative temperature section of the karez tunnel to be lower than the initial frost heaving water content;
s3: presetting a drilling area on the wall of a karez well (7), forming a plurality of grouting holes (6) in the drilling area, and injecting a potassium silicate solution into the drilling area through the grouting holes (6) until the content of potassium silicate in soil in the drilling area is greater than the preset value;
s4: mixing potassium silicate with soil to obtain mixed soil, and backfilling the mixed soil to block the grouting holes (6).
2. The method for reinforcing the karez tunnel with the borehole wall drilling grouting and the partial seepage prevention of the underdrain according to claim 1, wherein the specific method of S1 is as follows:
arranging a water interception dam at a position 12-14 m inward of a closure (3) of the karez tunnel, leading water to an open channel (2) at a position 6-7 m outward of the closure (3) through a water pump, and establishing a dry soil construction environment; and (5) cleaning sundries and deficient soil of the wall of the karez tunnel.
3. The method for reinforcing the karez tunnel with the borehole wall drilling grouting and the partial seepage prevention of the underdrain according to claim 1, wherein the specific method of S2 is as follows:
the method comprises the steps of setting an area, with the outward 0.78-0.90 m of a closure (3) and the inward 10.62-11.50 m of the closure (3), of the karez tunnel to be an anti-seepage section area, laying an ash-soil cushion layer (10) in the anti-seepage section area to be set and tamping the ash-soil cushion layer, setting the ash-soil cushion layer (10) to be a U-shaped groove structure, and sequentially laying two films (9) and a U-shaped concrete lining board (8) above the ash-soil cushion layer (10) to complete the anti-seepage section setting.
4. The method for reinforcing the karez tunnel with the borehole wall drilling grouting and the partial seepage prevention of the underdrain according to claim 3, wherein the thickness of the lime soil cushion layer (10) is 0.1-0.2 m.
5. The method for reinforcing the karez tunnel by borehole wall drilling grouting and local seepage prevention of the underdrain according to claim 3, characterized in that the U-shaped concrete lining plate (8) is made of concrete with the grade of C20 or above.
6. The method for reinforcing the karez tunnel with the borehole wall drilling grouting and the partial seepage prevention of the underdrain according to claim 1, wherein the specific method of S3 is as follows:
setting an area below 0.4-0.5 m on a karst well wall (7) of a karst tunnel with a closure (3) inward within the range of 10.62-11.50 m as a drilling area, drilling holes in the drilling area in a downward inclined manner, forming a plurality of grouting holes (6), plugging the grouting holes (6) by using a grout stop plug, filling a potassium silicate solution into a dropping bucket, connecting the grout stop plug with the grouting holes (6) through a liquid conveying pipe, injecting a potassium silicate solution into the grouting holes (6) for infiltration until the potassium silicate content in a soil body in the drilling area is greater than a preset value, and taking out the grout stop plug.
7. The method for reinforcing the karst tunnel with the borehole wall drilling grouting and the partial seepage prevention of the underdrain according to claim 6, wherein the mass concentration of the potassium silicate solution is 10-12%, wherein the potassium silicate is high-modulus potassium silicate with the modulus of 3.3; the preset value is 3%.
8. The method for reinforcing the karez tunnel with the borehole wall drilled with grouting and the underground canal partially impermeable according to claim 6, wherein the length of the grouting hole (6) is 0.5-0.6 m, and the diameter of the hole is 0.02-0.03 m; the included angle between the grouting hole (6) and the horizontal plane is 5°～15°。
9. The method for reinforcing the karez tunnel with the borehole wall drilled with grouting and the underground canal partially impermeable according to claim 6, wherein the plurality of grouting holes (6) are uniformly arranged, and the distance between every two adjacent grouting holes (6) is 0.18-0.20 m.
10. The method for reinforcing karez tunnels with borehole wall grouting and local underdrain seepage prevention according to claim 1, wherein the mass content of potassium silicate in the mixed soil in S4 is more than 3%, and when the mixed soil is used for backfilling and sealing the grouting holes (6) in S4, the backfilling density is more than or equal to 1.51g/cm3。
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Cited By (1)
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| CN114518292A (en) * | 2022-02-18 | 2022-05-20 | 西南交通大学 | Model test device and test method for high-speed railway roadbed of inclined crossing karez |
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| CN102995599A (en) * | 2012-11-15 | 2013-03-27 | 西安理工大学 | Anti-freeze anti-seepage water diversion treatment method of collapsible loess water-conveyance canal |
| CN103527213A (en) * | 2013-10-11 | 2014-01-22 | 中国水利水电科学研究院 | Method and device for reinforcing karez tunnel by anchoring self-rotating anchor rod on geogrid |
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