WO2021248872A1 - Procédé permettant de déterminer l'épaisseur de sécurité d'une paroi latérale dans la zone de karst d'un puits de fondation, et dispositif d'injection de coulis - Google Patents

Procédé permettant de déterminer l'épaisseur de sécurité d'une paroi latérale dans la zone de karst d'un puits de fondation, et dispositif d'injection de coulis Download PDF

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Publication number
WO2021248872A1
WO2021248872A1 PCT/CN2020/138501 CN2020138501W WO2021248872A1 WO 2021248872 A1 WO2021248872 A1 WO 2021248872A1 CN 2020138501 W CN2020138501 W CN 2020138501W WO 2021248872 A1 WO2021248872 A1 WO 2021248872A1
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WIPO (PCT)
Prior art keywords
karst
karst area
side wall
foundation pit
water
Prior art date
Application number
PCT/CN2020/138501
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English (en)
Chinese (zh)
Inventor
李兴盛
蒋腾飞
姜谙男
薛永锋
侯拉平
刘铁明
华波
王传嘉
卢迪
李玉宏
杜华林
刘杨
宋业华
孙喜军
王亮
马振谱
Original Assignee
中铁一局集团第二工程有限公司
中铁大连地铁五号线有限公司
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by 中铁一局集团第二工程有限公司, 中铁大连地铁五号线有限公司 filed Critical 中铁一局集团第二工程有限公司
Priority to JP2022558336A priority Critical patent/JP2023518992A/ja
Publication of WO2021248872A1 publication Critical patent/WO2021248872A1/fr

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    • 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
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads

Definitions

  • the invention relates to the field of foundation pit construction grouting, in particular to a method and a grouting device for determining the safe thickness of side walls in a karst area of a foundation pit.
  • the invention provides a method for determining the safe thickness of the side wall in the karst area of a foundation pit to overcome the above technical problems.
  • the present invention provides a method for determining the safe thickness of side walls in a karst area of a foundation pit, which includes the following steps:
  • S1 Determine the length m of the sidewall of the foundation pit affected by the karst zone, the length n of the karst zone, the steel supporting force F 1 of the sidewall of the foundation pit, the air pressure F 2 and the water pressure F 3 of the karst zone;
  • d is the safe thickness of the side wall in the karst area
  • W 1 is the deformation potential energy of the anti-outburst layer
  • W 2 is the work done by the external force
  • E is the elastic modulus of the water-resistant rock formation
  • ⁇ is the Poisson's ratio
  • the present invention also provides a grouting device used in the karst area of a foundation pit, including: a metal mesh, a water stop plate, a grouting pipe, a pumping pipe, and a one-way communication device for exporting the slurry;
  • the metal mesh covers the water outlet of the karst area; the edge of the water stop plate is fixedly connected with the edge of the water outlet of the karst area, the water stop plate does not completely cover the water outlet of the karst area, and the metal mesh is located at the water outlet of the karst area. Between the water stop and the water outlet of the karst zone;
  • the pumping pipe is used for pumping water out of the karst area, one end passes through the metal mesh, and the other end is placed in the karst area;
  • the side wall of the grouting pipe is provided with a plurality of first connecting ends with internal threads;
  • the one-way connecting device end is a second connecting end provided with an external thread, the second connecting end is connected with the first connecting end thread pair, and the one-way connecting device is used to lead the slurry to the metal
  • the net forms a blocking wall.
  • the one-way communication device includes: an outer member, an inner member, a spring, and a base;
  • the second connecting end is arranged at one end of the outer member, the outer member is hollow, and the outer member is sealed to the base;
  • the inner member is arranged inside the outer member, one end of the inner member close to the second connecting end is connected to the outside, and the other end of the inner member is connected to the base through a spring;
  • the side walls of the outer member and the inner member are respectively provided with a plurality of first slurry outlets and a plurality of second slurry outlets; the inner member moves to the base under the pressure of the slurry while compressing the spring, The plurality of second pulp outlets coincide with the plurality of first pulp outlets, and the slurry flows out.
  • it further includes a magnet for fixing the one-way communication device on the metal mesh, and the magnet is fixedly connected to the outer side wall of the one-way communication device.
  • a pumping pipe for pumping water out of the karst area, one end of the pumping pipe passing through the karst area and placed in the karst area.
  • the outer diameter of the inner member is equal to the inner diameter of the outer member.
  • the other end of the outer member is provided with an external thread; the base is provided with an internal thread, and is connected to the other end of the outer member with a thread pair.
  • the spacing of the plurality of first pulp outlets is equal to the spacing of the plurality of second pulp outlets.
  • the invention can quickly eliminate the risk of water gushing in the karst area of the foundation pit. Compared with the existing grouting structure, the invention solves the difficult problems of grout injection and karst water suction during construction, effectively realizes the blockage of the karst area, and has a good construction effect. It also saves engineering investment and guarantees construction safety; the present invention analyzes the relationship between various factors and the safety thickness of the side wall in the karst area by constructing a calculation model for the safety thickness of the side wall in the karst area, and gives a reasonable prediction of the safety thickness of the side wall in the karst area The calculation formula of, to ensure that the water inrush problem of the foundation pit in the karst area can be dealt with reasonably.
  • Figure 1 is a flow chart of determining the thickness of the side wall in a karst area according to an embodiment of the present invention
  • Figure 2 is a front view of a foundation pit and a karst area according to an embodiment of the present invention
  • Fig. 3 is a side view of the foundation pit and the karst area in the embodiment of the present invention.
  • Figure 4 is a schematic diagram of an embodiment of the present invention applied in a foundation pit
  • Fig. 5 is an enlarged view of A in Fig. 4 according to an embodiment of the present invention.
  • Figure 6 is a perspective view of Figure 2 of the embodiment of the present invention.
  • Figure 7 is a schematic diagram of the combination of a grouting pipe and a one-way communication device according to an embodiment of the present invention.
  • Fig. 8 is a schematic diagram of the structure of a grouting pipe according to an embodiment of the present invention.
  • Figure 9 is a schematic structural diagram of a one-way communication device according to an embodiment of the present invention.
  • the water distribution in the karst area 7 in the foundation pit 11 is extremely uneven and difficult to detect.
  • the thickness of the side wall in the karst area is too thin, it is easy to cause water inrush problems, and water inrush accidents are prone to occur during construction.
  • the present invention analyzes the relationship between various factors and the safe thickness of side walls in karst areas by constructing a calculation model for the safety thickness of side walls in karst areas , Give a reasonable calculation formula that can predict the safe thickness of the side wall in the karst area, and ensure that the water inrush problem of the foundation pit in the karst area can be dealt with reasonably.
  • the range of sudden instability of the foundation pit is mainly concentrated in the karst area, and it is radially damaged around the position of the pressure-bearing karst area, and the sidewalls have obvious failure surfaces; and with different surrounding rock conditions and karst area sizes
  • the plastic zone develops in a diffuse shape from the position of the karst zone to the side wall, and the influence range of the plastic zone is an expanded square.
  • the profile section of the karst area can be simplified as a square, the mutation mechanism of this phenomenon can be further analyzed, and the mechanical model shown in Figure 1 to Figure 3 can be established.
  • the present invention provides a method for determining the safe thickness of a side wall in a karst area, which includes the following steps:
  • the side wall of the karst zone is a prism body composed of countless thin cubes of uniform thickness, which determines the length m of the side wall of the foundation pit affected by the karst zone, the length n of the karst zone, and the steel supporting force F 1 of the side wall of the foundation pit.
  • the air pressure F 2 and the water pressure F 3 in the karst area; then the side wall of the karst area on the side of the foundation pit is under pressure F F 1 +F 2 -F 3 , and the side wall of the karst area is an elastoplastic medium.
  • the karst area The axial displacement of the side wall of the zone, that is, the deflection:
  • d is the safe thickness of the side wall in the karst area
  • the boundary conditions are:
  • E is the elastic modulus of the water-resistant rock layer
  • c is the thickness of the side wall slice in the karst area
  • ⁇ is the Poisson’s ratio
  • W 1 is the deformation potential energy of the side wall in the karst zone, which is the sum of the bending deformation potential energy W 11 and the intermediate strain potential energy W 12 , namely
  • W 2 is the work done by the external force, including the radial displacement work W 21 and the axial outward shift work W 22 ;
  • a 1 , a 2 , and a 3 are intermediate variables
  • x and y are intermediate variables
  • the safe thickness of the side wall of the karst area for water inrush can be obtained as:
  • the safe thickness of the side wall in the karst area is affected by the elastic modulus of the side wall in the karst area, that is, the elastic modulus, Poisson's ratio, karst water pressure, steel support axial force, air pressure, and foundation pit.
  • the size and the size of the karst zone are affected.
  • the step S5 is further: the corresponding safe thickness can be obtained through calculation based on actual geological survey conditions, and compared with the detected thickness.
  • the safe thickness is greater than the current detected thickness, the following methods are used
  • the grouting device in the karst area of the foundation pit performs grouting prevention.
  • the present invention also provides a grouting device used in the karst area of a foundation pit, as shown in Figs.
  • the net 3 covers the water outlet 7.1 of the karst area 7; the edge of the water stop plate 4 made of stainless steel and the edge of the water outlet 7.1 of the karst area 7 are fixedly connected by bolts 8, and the water stop plate 4 does not completely cover the
  • the water outlet 7.1 of the karst area 7 is to prevent the water from flowing out of the karst area, leaving a gap between the top edge of the water stop and the top of the karst area, so that the grouting pipe 1 and the one-way connecting device 5 extend into the karst area.
  • the metal mesh 3 is located between the water stop plate 4 and the water outlet 7.1 of the karst area 7, and the metal mesh 3 is fixed at the water outlet 7.1 of the karst area 7 through the extrusion of the water stop plate 4;
  • one end of the grouting pipe 1 has an opening for injecting grout into the inside, and the side wall of the grouting pipe 1 is provided with a plurality of first connecting ends 1-1 with internal threads;
  • one end of the one-way communication device 5 is a second connecting end 5-1 provided with an external thread, and the second connecting end 5-1 is connected with the threaded pair of the first connecting end 1-1.
  • the one-way communication device 5 is used to lead the slurry to the metal mesh 3 to form a blocking wall.
  • the one-way communication device 5 includes: an outer member 5-2, an inner member 5-3, a spring 5-4, and a base 5-5; the second connecting end 5-1 is disposed on the outer member 5.
  • the outer member 5-2 one end, the outer member 5-2 is hollow, the other end of the outer member 5-2 is provided with an external thread; the base 5-5 is provided with an internal thread, and the outer member 5-2 has a thread pair at the other end Connect to make the outer member 5-2 airtight, and at the same time it can be disassembled, to repair the inside of the one-way communication device 5 or replace the spring 5-4;
  • the inner member 5-3 is arranged inside the outer member 5-2
  • One end of the inner member 5-3 close to the second connecting end 5-1 is connected to the outside, and the other end of the inner member 5-3 is connected to the base 5-5 through a spring 5-4;
  • the side walls of the member 5-2 and the inner member 5-3 are respectively provided with a plurality of first slurry outlets 5-2-1 and a plurality of second
  • a water pumping pipe 2 for pumping water out of the karst area one end of the water pumping pipe 2 passes through the 3 and is placed in the karst area.
  • the outer member 5-2 and the inner member 5-3 are both cylindrical barrel-shaped structures made of stainless steel. 2 Pump out the water in the karst area so as not to affect the grout hanging on the metal mesh 3.
  • the grout flows into the six one-way connecting devices 5 from the six first connecting ends 1-1 of the side wall of the grouting pipe 1 respectively, and one-way communication
  • the spring 5-4 is squeezed to make the two second slurry outlets 5-3-1 and the two first slurry outlets 5-2- 1 overlaps, the slurry flows out from the first slurry outlet 5-2-1 and quickly solidifies near the metal mesh 3.
  • the outer member 5-2 A magnet 9 is fixed on the outer wall of the metal mesh.
  • the magnet 9 is a powerful magnet, so that the one-way communication device 5 can be adsorbed on the metal mesh 3. When a region of the metal mesh 3 is hung with slurry, the grouting is stopped.
  • the inner member 5-3 is squeezed and reset by the spring 5-4; the grouting pipe 3 and the one-way communication device 5 are replaced on the metal mesh 3, and only grouting is required until the entire metal mesh 3 and its adjacent area It is filled with grout and solidified continuously to form a blocking wall that blocks the outlet 7.1 of the karst zone 7; because the maximum width of the entire device is greater than the maximum width of the metal mesh 3, when the device is placed in the karst zone, the metal mesh can be dismantled After putting the device in, finally the remaining ungrouted area of the metal mesh 3 is small and the other damaged areas are connected and repaired with metal wires, and five of the one-way connecting devices 5 are removed, and only one one-way connecting device 5 is retained. Grouting, at this time, the single one-way connecting device 5 can be taken out of the grid.
  • the outer diameter of the inner member 5-3 and the outer member 5- 2 The inner diameters are equal.
  • the plurality of first slurry outlets 5-2-1 it is convenient for the plurality of first slurry outlets 5-2-1 to allow the slurry to flow out at the same time, thereby improving the grouting efficiency.
  • the distance between the plurality of first slurry outlets 5-2-1 and the plurality of second slurry outlets The spacing between ports 5-3-1 is equal.

Abstract

La présente invention concerne un procédé permettant de déterminer l'épaisseur de sécurité d'une paroi latérale dans une zone de karst d'un puits de fondation, comprenant les étapes consistant à : déterminer la longueur m de la paroi latérale, affectée par la zone de karst, du puits de fondation, la longueur n de la zone de karst, et la force F1 de support en acier, la pression d'air F2 et la pression d'eau F3 de la paroi latérale du puits de fondation ; et calculer le déplacement axial, l'énergie potentielle et l'épaisseur de sécurité de la paroi latérale dans la zone de karst selon la théorie élastique-plastique, la loi de conservation de l'énergie et la théorie des catastrophes. La présente invention concerne également un dispositif d'injection de coulis pour une zone de karst d'un puits de fondation, comprenant un filet métallique, une plaque d'arrêt d'eau, un tuyau d'injection de coulis, un tuyau de pompage d'eau et un dispositif de communication unidirectionnelle. Selon la présente invention, le risque de jaillissement d'eau dans une zone de karst d'un puits de fondation peut être rapidement éliminé, les problèmes de difficulté d'injection de boue, d'aspiration vers l'arrière d'eau de karst et similaires dans la construction sont résolus, une zone de karst peut être bloquée, l'investissement de projet est économisé et la sécurité de construction est garantie.
PCT/CN2020/138501 2020-06-11 2020-12-23 Procédé permettant de déterminer l'épaisseur de sécurité d'une paroi latérale dans la zone de karst d'un puits de fondation, et dispositif d'injection de coulis WO2021248872A1 (fr)

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JP2022558336A JP2023518992A (ja) 2020-06-11 2020-12-23 基礎坑におけるカルスト地域の側壁の安全な厚さを確定するための方法及びグラウト注入装置

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CN202010531608.2A CN111733794A (zh) 2020-06-11 2020-06-11 一种确定基坑岩溶区侧墙安全厚度的方法及注浆装置
CN202010531608.2 2020-06-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111733794A (zh) * 2020-06-11 2020-10-02 中铁一局集团第二工程有限公司 一种确定基坑岩溶区侧墙安全厚度的方法及注浆装置
CN114359491A (zh) * 2021-12-03 2022-04-15 中铁第四勘察设计院集团有限公司 岩溶的三维建模方法、装置、电子设备及存储介质

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US8585328B2 (en) * 2007-04-17 2013-11-19 Eric W. Smith Underground filling and sealing method
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CN110904951A (zh) * 2019-12-24 2020-03-24 广州市住宅建设发展有限公司 富水岩溶发育地质的地下连续墙的施工方法及止浆墙结构
CN111733794A (zh) * 2020-06-11 2020-10-02 中铁一局集团第二工程有限公司 一种确定基坑岩溶区侧墙安全厚度的方法及注浆装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8585328B2 (en) * 2007-04-17 2013-11-19 Eric W. Smith Underground filling and sealing method
RU2537448C1 (ru) * 2013-06-17 2015-01-10 Олег Иванович Лобов Способ укрепления оснований зданий на структурно-неустойчивых грунтах и грунтах с карстовыми образованиями
CN104594369A (zh) * 2014-11-27 2015-05-06 中国电建集团贵阳勘测设计研究院有限公司 喀斯特地区高压群孔置换灌浆方法及其结构
CN207177933U (zh) * 2016-11-23 2018-04-03 中国电建集团华东勘测设计研究院有限公司 一种高压大流量地下水超前封堵结构
CN107227740A (zh) * 2017-07-21 2017-10-03 广东省源天工程有限公司 地下连续墙施工中石灰岩溶洞槽壁封闭的施工方法
CN110904951A (zh) * 2019-12-24 2020-03-24 广州市住宅建设发展有限公司 富水岩溶发育地质的地下连续墙的施工方法及止浆墙结构
CN111733794A (zh) * 2020-06-11 2020-10-02 中铁一局集团第二工程有限公司 一种确定基坑岩溶区侧墙安全厚度的方法及注浆装置

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