WO2022017226A1 - 一种充填可溶晶体的注浆结构及施工方法 - Google Patents

一种充填可溶晶体的注浆结构及施工方法 Download PDF

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Publication number
WO2022017226A1
WO2022017226A1 PCT/CN2021/106035 CN2021106035W WO2022017226A1 WO 2022017226 A1 WO2022017226 A1 WO 2022017226A1 CN 2021106035 W CN2021106035 W CN 2021106035W WO 2022017226 A1 WO2022017226 A1 WO 2022017226A1
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WO
WIPO (PCT)
Prior art keywords
water
permeable
pipe
grouting
section
Prior art date
Application number
PCT/CN2021/106035
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English (en)
French (fr)
Chinese (zh)
Inventor
范雲鹤
郑长青
喻渝
赵万强
孙红月
胖涛
曹彧
谭永杰
刘金松
刘洋
尚岳全
帅飞翔
琚国全
蒋立
Original Assignee
中铁二院工程集团有限责任公司
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Filing date
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Application filed by 中铁二院工程集团有限责任公司 filed Critical 中铁二院工程集团有限责任公司
Priority to EP21847342.9A priority Critical patent/EP4015709B1/de
Publication of WO2022017226A1 publication Critical patent/WO2022017226A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/10—Restraining of underground water by lowering level of ground water
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors

Definitions

  • the invention relates to the technical field of slope drainage engineering, in particular to a grouting structure filled with soluble crystals and a construction method.
  • the existing slope drainage measures mainly include: surface drainage ditches and blind drainage ditches, water collection wells, horizontal drainage holes, underground drainage holes, negative pressure drainage technology, etc.
  • the existing side slope negative pressure drainage technology mainly divides the side slope drilling into a water-permeable drilling section and a grouting closed drilling section, and a water-swellable rubber water-stop ring is arranged between the two, as described in Chinese Patent Publication No. CN107246019A
  • a self-starting negative pressure drainage system for side slope groundwater drilling which has downwardly inclined drilling holes, grouting into the grouting closed drilling section, and the reserved permeable drilling section is isolated from the outside atmosphere.
  • the water inlet is arranged in the permeable pipe, and the water outlet extends out of the ground through the water-swellable rubber water stop ring for drainage.
  • the pressure in the hole will gradually increase with the infiltration of groundwater, causing the groundwater to flow out of the water outlet naturally. Therefore, the water in the soil around the permeable pipe continues to flow to the permeable pipe, forcing the groundwater on the slope to quickly flow to the borehole to discharge the surface. At the same time, due to the negative pressure in the permeable pipe, the water in all directions around the permeable pipe will flow to the permeable pipe, so the drainage range will be increased, and the increased drainage range is more conducive to draining the groundwater in the slope.
  • the difficulty of negative pressure drainage technology is that the permeable drilling section needs to maintain the permeable effect, and the grouting of the grouting closed drilling section cannot enter the permeable drilling section. If the grouting pressure is high, the slurry will often break through the baffle structure such as the expansion rubber water stop ring and enter the permeable drilling section, resulting in the failure of the drilling; if the grouting pressure is small, the drilling section cannot be closed, and the effect of negative pressure cannot be formed. . Therefore, a new grouting technology is required to solve the above problems.
  • the purpose of the present invention is to overcome the problem that the existing negative pressure drainage technology is difficult to control the grouting pressure, which easily leads to the failure of negative pressure drainage, and provides a grouting structure and construction method for filling soluble crystals.
  • the present invention provides the following technical solutions:
  • a grouting structure filled with soluble crystals comprising a water permeable section and a grouting section, the water permeable section is located at the lower part of a down-sloping borehole, the grouting section is located at the upper part of the borehole, and the water permeable section and the grouting section
  • a water-stop member is arranged between the slurry sections, a water-permeable tube is arranged in the water-permeable section, the top of the water-permeable tube contacts the water-stop member, a cavity is formed in the water-permeable tube, and the water-permeable tube is filled with solid soluble crystals , the groundwater penetrates into the cavity through the water permeable pipe, the water inlet of the drainage pipe is arranged in the water permeable section, and the water inlet of the drainage pipe passes through the water stop member and is inserted into the water permeable pipe, and the drainage pipe is inserted into the water permeable pipe.
  • the water outlet of the pipe is located at the lower part of the slope body, the elevation of the water inlet of the drainage pipe is higher than the elevation of the water outlet of the drainage pipe, the lift of the drainage pipe is less than the height of the water column corresponding to the atmospheric pressure, and the drainage pipe is connected to the grouting section hole.
  • the spaces between the walls are used for grouting.
  • the permeable pipe is a pipe body with permeable holes in the pipe wall.
  • the lift of the drain pipe is smaller than the height of the water column corresponding to the atmospheric pressure, that is, the height difference between the water inlet of the drain pipe and the borehole orifice is smaller than the height of the water column corresponding to the local atmospheric pressure, so that negative pressure drainage can be performed.
  • the water permeable pipe is filled with the solid soluble crystals, so that the water stop member can be supported to a certain extent during grouting , it is beneficial to prevent the slurry from entering the permeable section, and to prevent the water-stop member from being squeezed to cause a large displacement, and at the same time, it can increase the grouting pressure, which is beneficial to reduce the porosity of the grouting section.
  • the permeable section finally forces the groundwater in the slope to be discharged to the surface, and the cavity in the permeable pipe can facilitate the infiltration of groundwater after the soluble crystals are dissolved.
  • the use of this structure is beneficial to increase the grouting pressure, reduce the cracks in the grouting section, improve the sealing effect, and further enhance the negative pressure effect of the permeable section, and can effectively support the water-stop member during grouting to prevent the slurry from entering the permeable section.
  • the soluble crystals comprise at least one of solid salt, solid sugar, solid alum and solid ice.
  • Different soluble crystals have different dissolution rates, and can be selected and matched according to actual needs.
  • solid salt and solid alum after dissolving, certain residues will be formed in the permeable section and the drainage pipe, which is beneficial to inhibit the growth of plants in the drainage pipe and the permeable section, effectively avoid blockage, and help ensure the entire drainage. System availability and continuity.
  • the slurry of the grouting section is cement mortar or cement-water glass double slurry.
  • the water-stop member comprises a water-swellable rubber water-stop strip, a water-stop belt or a sandbag.
  • the bottom of the permeable pipe is provided with a pipe shoe.
  • a construction method for a grouting structure filled with soluble crystals using the grouting structure filled with soluble crystals as described in any of the above, comprising the following steps:
  • a water-permeable pipe is arranged in the water-permeable section, and then a drain pipe is inserted into the water-permeable pipe;
  • the water-stop member is supported by filling the water-permeable pipe with solid soluble crystals without additional difficulty and cost. , effectively improve the grouting pressure in the grouting process, which is conducive to improving the grouting efficiency, avoiding damage to the water-stop parts, and effectively ensuring the grouting effect, thereby ensuring the effective formation of a negative pressure environment, thereby ensuring the effective operation of the drainage system and achieving continuity. drain.
  • step d the following steps are also included:
  • the pumping is stopped, where ⁇ 0 is the initial concentration of the soluble crystal.
  • step e water above 40°C is injected.
  • the use of a grouting structure filled with soluble crystals according to the present invention is beneficial to increase the grouting pressure, reduce the cracks in the grouting section, improve the sealing effect, and then improve the negative pressure effect of the permeable section.
  • it can effectively support the water-stop member, prevent the slurry from entering the permeable section and interfere with the formation of negative pressure environment, avoid the blockage of the permeable pipe, and prevent the water-stop member from producing large displacement due to extrusion, which is conducive to ensuring the continuity of the deep layer of the slope.
  • the drainage effect is of great significance to solving the drainage management problem of large-scale landslides.
  • FIG. 1 is a schematic structural diagram of a grouting structure filled with soluble crystals according to the present invention
  • FIG. 2 is a schematic diagram of drainage of a grouting structure filled with soluble crystals according to the present invention.
  • a grouting structure filled with soluble crystals includes a water permeable section 21 and a grouting section 22, the water permeable section 21 is located at the lower part of the downwardly inclined borehole, and the grouting section
  • the section 22 is located at the upper part of the borehole, a water stop member 23 is arranged between the permeable section 21 and the grouting section 22, the permeable section 21 is provided with a permeable pipe 1, and the top of the permeable pipe 1 contacts the water stopper Component 23, a cavity is formed in the permeable pipe 1, the permeable pipe 1 is filled with solid soluble crystals 3, groundwater penetrates into the cavity through the permeable pipe 1, and the permeable section 21 is provided with drainage
  • the water inlet of the pipe 4 the water inlet of the drainage pipe 4 is inserted into the permeable pipe 1 after passing through the water stop member 23, the water outlet of the drainage pipe 4 is located at the lower part of the slope, and the drainage pipe 4 enters The elevation of the water outlet is
  • the hole diameter of the hole should be greater than 90mm
  • the permeable pipe 1 can be a corrugated pipe with holes woven with filter cloth and HDPE inside, which can prevent large particles such as coarse sand and gravel from entering.
  • the bottom of the permeable pipe 1 A pipe shoe is provided.
  • the pipe shoe can be an HDPE pipe with a sealed bottom and an open top, and is sleeved on the bottom of the permeable pipe 1 (not shown in the figure).
  • the drainage pipe 4 can be used with a pipe diameter of 4-8mm.
  • the PA pipe, the drainage pipe 4 has good air tightness, the drainage capacity of the drainage pipe 4 is greater than the flow rate of the slope groundwater infiltration into the permeable section 21, which is convenient for the slope groundwater level to rise and cause the
  • the slurry 24 of the grouting section 22 adopts cement mortar or cement-water glass double slurry to cut off the water-gas connection between the ground surface and the cavity of the permeable borehole section.
  • the water-stop member 23 includes a water-swellable rubber stopper. Water strips, water stop belts or sandbags, after the water stop member 23 is closed, the gap between the drain pipe 4 of the grouting section 22 and the hole wall is closed by grouting.
  • the soluble crystal 3 contains at least one of solid salt, solid sugar, solid alum and solid ice.
  • the inside of the permeable pipe 1 and the drain pipe 4 are filled with the soluble crystals 3 , so as to effectively support the water stop member 23 during grouting. After that, continuous groundwater or additional water is added into the water permeable pipe 1 over time, so that the soluble crystals 3 can be dissolved, thereby freeing the cavity in the water permeable pipe 1 for drainage.
  • Different soluble crystals 3 have different dissolution rates, which can be selected according to actual conditions.
  • the structure is beneficial to increase the grouting pressure, reduce the cracks in the grouting section, improve the sealing effect, and further improve the negative pressure effect of the permeable section, and can effectively support the water-stop member during grouting, preventing the slurry from entering the permeable section and disturbing
  • the formation of a negative pressure environment avoids the blockage of the permeable pipe, prevents the water-stop member from producing a large displacement due to extrusion, and, such as solid salt and solid alum, will form in the permeable section 21 and the drain pipe 4 after dissolving.
  • Certain residues are beneficial to inhibit the growth of plants in the drainage pipe 4 and the permeable section 21, effectively avoid blockage, and help to ensure the effectiveness and continuity of the entire drainage system.
  • the construction method of a grouting structure filled with soluble crystals according to the present invention adopts a grouting structure filled with soluble crystals as described in Embodiment 1, and includes the following steps:
  • the geological survey drill a downwardly inclined borehole, and make the permeable section 21 of the borehole located below the groundwater level 5 controlled by the slope; In the position of section 21, the height difference between the bottom of the borehole and the orifice of the borehole is less than the height of the water column corresponding to the local atmospheric pressure, so as to ensure that the lift of the drain pipe 4 meets the requirements;
  • a permeable pipe 1 is arranged in the permeable section 21, and then a drain pipe 4 is inserted into the permeable pipe 1, so that the port of the drain pipe 4 goes deep into the bottom of the permeable pipe 1;
  • the slurry 24 is injected into the borehole to form the grouting section 22 by the backward method. During grouting, the grouting pressure can be increased, and the slurry 24 flows into the surrounding soil to further ensure the grouting section 22. closed;
  • step f the degree of dissolution of the soluble crystals 3 can be roughly obtained according to the amount of water injection and the amount of the soluble crystals 3, and it can be inferred that the predetermined degree of dissolution can be reached according to time, and complete dissolution is not limited. In this way, the cavity in the permeable pipe 1 can be vacated more quickly, so that the groundwater in the surrounding soil can penetrate into the permeable pipe 1 .
  • step f when it is detected that the concentration ⁇ of the soluble crystals 3 is less than or equal to 1/2 ⁇ 0 , the suction is stopped, wherein ⁇ 0 is the initial concentration of the soluble crystals 3, and ⁇ 0 can be determined according to the water permeability
  • ⁇ 0 is the initial concentration of the soluble crystals 3
  • ⁇ 0 can be determined according to the water permeability
  • the volume of the segment, the amount of water injected and the mass of the soluble crystals 3 can be roughly obtained, or the concentration of the liquid extracted for the first time after a certain period of time can be used as a reference.
  • the aforementioned concentration requirements are mainly used to roughly grasp the dissolution of the soluble crystals 3 .
  • the soluble crystal 3 is solid ice, since the soil has a temperature and can effectively melt the solid ice, it is not necessary to inject water. There is also no need to check the concentration.
  • the groundwater level line 5 in the slope body is higher than the highest point of the drainage pipe 4 (that is, at the hole of the drilling hole)
  • the water head height of the water inlet of the drainage pipe 4 is higher than that of the drilling hole.
  • the water head height of the orifice of the hole, the groundwater in the permeable section 21 will be discharged from the drainage pipe 4 under the action of the water head difference, and the drainage process occurs.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Paleontology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Agronomy & Crop Science (AREA)
  • Soil Sciences (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
PCT/CN2021/106035 2020-07-20 2021-07-13 一种充填可溶晶体的注浆结构及施工方法 WO2022017226A1 (zh)

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EP21847342.9A EP4015709B1 (de) 2020-07-20 2021-07-13 Mit löslichem kristall gefüllte vergussstruktur und herstellungsverfahren

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CN202010700824.5 2020-07-20
CN202010700824.5A CN111794238B (zh) 2020-07-20 2020-07-20 一种充填可溶晶体的注浆结构及施工方法

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CN111794238B (zh) * 2020-07-20 2021-05-04 中铁二院工程集团有限责任公司 一种充填可溶晶体的注浆结构及施工方法
CN113323723B (zh) * 2021-06-25 2021-11-16 中铁二院工程集团有限责任公司 岩溶或断层的隧道及边坡的酸溶钻孔排水结构及施工方法
CN113445959B (zh) * 2021-08-10 2022-02-01 中铁二院工程集团有限责任公司 岩溶或断层隧道的钻孔排水结构及其施工方法和施工结构

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EP4015709B1 (de) 2023-05-31
CN111794238A (zh) 2020-10-20
CN111794238B (zh) 2021-05-04
EP4015709A4 (de) 2022-12-28

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