EP4015709A1 - Mit löslichem kristall gefüllte vergussstruktur und herstellungsverfahren - Google Patents

Mit löslichem kristall gefüllte vergussstruktur und herstellungsverfahren Download PDF

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Publication number
EP4015709A1
EP4015709A1 EP21847342.9A EP21847342A EP4015709A1 EP 4015709 A1 EP4015709 A1 EP 4015709A1 EP 21847342 A EP21847342 A EP 21847342A EP 4015709 A1 EP4015709 A1 EP 4015709A1
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EP
European Patent Office
Prior art keywords
water
permeable
grouting
section
pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP21847342.9A
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English (en)
French (fr)
Other versions
EP4015709B1 (de
EP4015709A4 (de
Inventor
Yunhe FAN
Changqing ZHENG
Yu YU
Wanqiang ZHAO
Yongping Zeng
Tao Pang
Yu Cao
Yongping Zhang
Yongjie TAN
Jinsong Liu
Yang Liu
Liang KUANG
Changguo HE
Yuzhe ZHOU
Guoquan JU
Li Jiang
Youhao LONG
Xiaochuan REN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway Eryuan Engineering Group Co Ltd CREEC
Original Assignee
China Railway Eryuan Engineering Group Co Ltd CREEC
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Publication of EP4015709A1 publication Critical patent/EP4015709A1/de
Publication of EP4015709A4 publication Critical patent/EP4015709A4/de
Application granted granted Critical
Publication of EP4015709B1 publication Critical patent/EP4015709B1/de
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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 present invention relates to the technical field of slope drainage engineering, and in particular, to a grouting structure filled with soluble crystals and a construction method thereof.
  • the existing drainage measures for slope mainly include surface drainage ditch, blind ditch, collecting well, horizontal drainage borehole, underground drainage hole, negative pressure drainage, etc.
  • the existing negative pressure drainage technology for slope mainly divides the slope boreholes into a water-permeable borehole section and a grouting seal borehole section, with a water-stop ring made of water-expanding rubber in between.
  • a declination borehole grout into the grouting seal borehole section, and the reserved water-permeable borehole section is isolated from the outside atmosphere.
  • the water inlet of the drain pipe is arranged in the permeable pipe, and the water outlet of such pipe extends out of the ground through the water-stop ring made of water-expanding rubber for drainage.
  • the pressure in the borehole will gradually increase with the infiltration of groundwater, leading to the natural outflow of the groundwater from the water outlet.
  • the drainage capacity of the drain pipe is greater than the flow rate of groundwater in the slope infiltrating into the cavity of the water-permeable borehole section and the air pressure in the permeable pipe is lower than the atmospheric pressure (a negative pressure is formed)
  • the water in the soil around the permeable pipe continues to flow towards it, forcing the groundwater in the slope to flow rapidly towards the borehole to drain to the surface.
  • the negative pressure in the permeable pipe the water in all directions around the permeable pipe will flow towards it, so the drainage range will increase, and such increased drainage range is more conducive to discharging the groundwater in the slope.
  • the difficulty of negative pressure drainage technology is that the water-permeable borehole section needs to maintain its permeability, and the slurry of the grouting seal borehole section cannot enter the water-permeable borehole section. If the pressure of grouting is high, the slurry will often break through the baffle structure such as the water-stop ring made of water-expanding rubber and enter the water-permeable borehole section, resulting in the failure of the borehole; if the pressure of grouting is small, the borehole section cannot be closed and the negative pressure cannot be formed. Accordingly, in order to solve the above problems, a new grouting technology is required.
  • an object of the present invention is to provide a grouting structure filled with soluble crystals and a construction method thereof.
  • a grouting structure filled with soluble crystals comprising a water-permeable section and a grouting section, wherein the water-permeable section is located at the lower part of a declination borehole, and the grouting section is situated at the upper part of the borehole; a water-stop component is arranged between the water-permeable section and the grouting section; a permeable pipe is arranged in the water-permeable section; the top of the permeable pipe is in contact with the water-stop component; a cavity is formed in the permeable pipe; the permeable pipe is filled with solid soluble crystals; the groundwater penetrates into the cavity through the permeable pipe; the water inlet of the drain pipe is arranged in the water-permeable section, and the water inlet of the drain pipe inserts into the permeable pipe after passing through the water-stop component; the water outlet of the drain pipe is located at the lower part of the slope; the elevation of the water
  • the permeable pipe is a pipe with permeable holes on its pipe wall.
  • the lift of the drain pipe being smaller than the height of the water column corresponding to atmospheric pressure means 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 in order to perform negative pressure drainage.
  • the present invention provides a grouting structure filled with soluble crystals, wherein the permeable pipe is filled with the solid soluble crystals to support the water-stop component to a certain extent during grouting, contributing to the prevention of the slurry from entering the water-permeable section, and the water-stop component from being squeezed to cause a large displacement; at the same time, grouting pressure will be increased to reduce the porosity of the grouting section and a better sealing can be achieved to ensure the negative pressure effect of the water-permeable section.
  • the soluble crystals can dissolve, thereby changing the osmotic pressure of the surrounding soil, leading to the water flow from the surrounding soil to the permeable section and finally forcing the groundwater in the slope to be discharged to the surface; the cavity in the permeable pipe can facilitate the infiltration of groundwater after the soluble crystals dissolve.
  • the present structure is beneficial to increase the pressure of grouting, reduce cracks in the grouting section, and improve the sealing effect, thus enhancing the negative pressure effect of the water-permeable section, effectively supporting the water-stop component during grouting, preventing the slurry from entering the water-permeable section and the consequent interference in the formation of a negative pressure environment, avoiding blockage of the permeable pipe, and preventing large displacement of the water-stop component by squeezing. It is conducive to ensuring continuous drainage of the deep portion of the slope, and is of great significance in solving the problem of drainage treatment of large-scale landslide.
  • the soluble crystals comprise at least one of solid salt, solid sugar, solid alum and solid ice.
  • the slurry of the grouting section is cement mortar or cement-sodium silicate slurry.
  • the water-stop component includes a water-stop strip made of water-expanding rubber, a water-stop belt or sandbags.
  • the bottom of the permeable pipe is provided with a pipe boot.
  • a construction method for a grouting structure filled with soluble crystals using any of the above-mentioned grouting structures filled with soluble crystals, comprising the following steps:
  • Adopting a construction method of a grouting structure filled with soluble crystals recites in the present invention, wherein the permeable pipe is filled with solid soluble crystals to support the water-stop component, does not increase additional difficulty and cost, effectively improving the pressure of grouting in the grouting process, contributing to the improvement of grouting efficiency and avoidance of the damage to the water-stop component, and effectively ensuring the grouting effect, thereby guaranteeing the effective formation of a negative pressure environment for efficient operation of the drainage system and continuous drainage.
  • step d the following steps are also included:
  • step f stop pumping when the concentration ⁇ of the soluble crystals is less than or equal to 1/2 ⁇ 0 , wherein ⁇ 0 stands for the initial concentration of the soluble crystals.
  • step e inject water above 40° C.
  • Element Reference 1-permeable pipe, 21-water-permeable section, 22-grouting section, 23-water-stop component, 24-slurry, 3-soluble crystals, 4-drain pipe, 5-groundwater level line.
  • a grouting structure filled with soluble crystals of the present invention comprising a water-permeable section 21 and a grouting section 22, wherein the water-permeable section 21 is located at the lower part of a declination borehole, and the grouting section 22 is situated at the upper part of the borehole; a water-stop component 23 is arranged between the water-permeable section 21 and the grouting section 22; a permeable pipe 1 is arranged in the water-permeable section 21; the top of the permeable pipe 1 contacts the water-stop component 23; a cavity is formed in the permeable pipe 1; the permeable pipe 1 is filled with solid soluble crystals 3; the groundwater penetrates into the cavity through the permeable pipe 1; the water inlet of the drain pipe 4 is arranged in the water-permeable section 21, and the water inlet of the drain pipe 4 inserts into the permeable pipe 1 after passing through the water-stop component 23; the water outlet of the drain pipe 4 is located at the lower
  • the diameter of the borehole should be larger than 90mm
  • the permeable pipe 1 can be a corrugated pipe, externally covered with filter cloth and internally supported by HDPE, preventing large particles such as coarse sand and gravel from entering;
  • a pipe boot is set at the bottom of the permeable pipe 1;
  • the pipe boot can be a 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 FIG);
  • the drain pipe 4 can be a PA pipe with a diameter of 4-8mm;
  • the drain pipe 4 has good air tightness;
  • the drainage capacity of the drain pipe 4 is greater than the flow rate of groundwater in slope infiltrating into the water-permeable section 21, facilitating natural drainage when the water head height of the cavity in the permeable pipe 1 is greater than the orifice elevation of the borehole as a result of elevated groundwater level, discharging groundwater of the slope in real time, and keeping the groundwater below the safe water level;
  • the soluble crystals 3 comprise at least one of solid salt, solid sugar, solid alum and solid ice.
  • the space between the permeable pipe 1 and the drain pipe 4 is filled with the soluble crystals 3, providing effective support for the water-stop component 23 during grouting. After that, groundwater will flow into or additional water will be added into the permeable pipe 1 over time, dissolving the soluble crystals 3 and then freeing the cavity in the permeable pipe 1 for drainage.
  • Different soluble crystals 3 have different dissolution rates and can be selected according to actual needs.
  • the present structure is beneficial to increase the pressure of grouting, reduce cracks in the grouting section, and improve the sealing effect, thus enhancing the negative pressure effect of the water-permeable section, effectively supporting the water-stop component during grouting, preventing the slurry from entering the water-permeable section and the consequent interference in the formation of a negative pressure environment, avoiding blockage of the permeable pipe, and preventing large displacement of the water-stop component by squeezing; besides, solid salt and solid alum, after dissolving, will form a certain residue in the water-permeable section 21 and the drain pipe 4, contributing to the inhibition of growth of plants in the drain pipe 4 and the water-permeable section 21, the effective avoidance of blockage, and the guarantee of availability 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:
  • step f the solubility of the soluble crystals 3 can be roughly obtained according to the amount of water injected and the amount of the soluble crystals 3.
  • the prediction of reaching the predetermined solubility according to time is acceptable, and complete dissolution is not a must.
  • the cavity in the permeable pipe 1 can be vacated more quickly with water injection, as such, the groundwater in the surrounding soil can penetrate into the permeable pipe 1.
  • step f the pumping is stopped when it is detected that the concentration ⁇ of the soluble crystals 3 is less than or equal to 1/2 ⁇ 0 , wherein ⁇ 0 is the initial concentration of the soluble crystals 3 and can be can be roughly obtained according to the volume of the water-permeable section, the amount of water injected and the mass of the soluble crystals 3, or by referring to the concentration of the liquid extracted for the first time after a certain period of time.
  • concentration requirements are mainly used to roughly grasp the dissolution of the soluble crystals 3.
  • Water injection is optional, that is, not to perform steps e and f, but to utilize the penetration of groundwater into the permeable section 21 to dissolve the soluble crystals 3.
  • the osmotic pressure increases, the attraction to groundwater elevates, and then the infiltration of groundwater into the permeable pipe 1 is accelerated; at the same time, the solution will diffuse freely and the groundwater can still effectively dissolve the soluble crystals 3 when the groundwater needs to be drained.
  • the soluble crystal 3 When the soluble crystal 3 is solid ice it can be effectively melt since the soil has a temperature and there is no need to inject water; after the ice melts, the cavity in the permeable pipe 1 is vacated and there is no need to test the concentration.
  • the groundwater level line 5 in the slope is higher than the highest point of the drain pipe 4 (that is where the orifice of the borehole is located)
  • the water head height of the water inlet of the drain pipe 4 is higher than that of the orifice of the borehole, discharging groundwater in the water-permeable section 21 by the drain pipe 4 under a water head difference, and triggering a drainage process.
  • a siphon drainage process is started and negative pressure is generated in the water-permeable section 21.
  • the groundwater in the slope accelerates into the cavity, and after the groundwater in the cavity and the soil above the water-permeable section 21 in the slope is drained, an entire drainage process ends; wherein with cycles of rainfall infiltration, the drainage process circulates, effectively realizing continuous drainage of a deep portion of the slope, solving a problem of drainage treatment of large landslide, and ensuring the stability of the slope with low maintenance cost.

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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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
PCT/CN2021/106035 WO2022017226A1 (zh) 2020-07-20 2021-07-13 一种充填可溶晶体的注浆结构及施工方法

Publications (3)

Publication Number Publication Date
EP4015709A1 true EP4015709A1 (de) 2022-06-22
EP4015709A4 EP4015709A4 (de) 2022-12-28
EP4015709B1 EP4015709B1 (de) 2023-05-31

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

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EP (1) EP4015709B1 (de)
CN (1) CN111794238B (de)
WO (1) WO2022017226A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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ITPC20060043A1 (it) * 2006-10-02 2008-04-03 Cesare Melegari Metodo per la realizzazione di opere di drenaggio , in particolare per la stabilizzazione, di versanti e/o terreni instabili o franosi
JP4716134B2 (ja) * 2007-04-25 2011-07-06 東洋建設株式会社 斜面の安定化工法
JP5313192B2 (ja) * 2010-03-03 2013-10-09 公益財団法人鉄道総合技術研究所 注入材を用いた排水体による斜面安定化工法
CN102251529A (zh) * 2011-06-02 2011-11-23 浙江大学 一种边坡倾斜钻孔自平衡虹吸排水方法
CN102635402A (zh) * 2012-04-11 2012-08-15 浙江大学 隧道洞壁渗水处置的下倾钻孔虹吸排水法
CN107237650B (zh) * 2017-06-30 2020-02-11 浙江大学 一种用于处理隧道洞壁渗水的钻孔虹吸负压排水系统及方法
CN107246019B (zh) * 2017-06-30 2019-10-29 浙江大学 一种边坡地下水钻孔自启动负压排水方法
CN109629566B (zh) * 2019-01-16 2021-04-06 宁夏大学 一种真空排水锚杆及其施工方法
CN209780957U (zh) * 2019-03-13 2019-12-13 云南建投基础工程有限责任公司 一种富水铁路隧道底部泄水降压及加固结构
CN111005760A (zh) * 2019-12-27 2020-04-14 中铁二院工程集团有限责任公司 一种岩溶隧道引流式排水系统
CN111425249A (zh) * 2020-03-30 2020-07-17 中铁二院工程集团有限责任公司 一种隧道风动力排水系统
CN111810234B (zh) * 2020-07-20 2021-06-29 中铁二院工程集团有限责任公司 隧道渗水兼有害气体排放结构及半封闭充冰钻孔施工方法
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

Also Published As

Publication number Publication date
EP4015709B1 (de) 2023-05-31
WO2022017226A1 (zh) 2022-01-27
CN111794238A (zh) 2020-10-20
CN111794238B (zh) 2021-05-04
EP4015709A4 (de) 2022-12-28

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