Three-dimensional treatment method of subway deep foundation pit in karst intense development region

A processing method, three-dimensional technology, applied in excavation, infrastructure engineering, construction, etc., to achieve the effect of facilitating construction organization, improving safety, and reducing the risk of later operation

Inactive Publication Date: 2016-08-17
CHINA CONSTR COMM ENG GRP UNITED
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, there are few construction examples of deep foundation pits of urban subway stations in areas with strong karst development at home and abroad, and there is no mature technical experience to follow. It is imperative to explore effective methods for the treatment of subway foundation pits in areas with strong karst development

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  • Three-dimensional treatment method of subway deep foundation pit in karst intense development region
  • Three-dimensional treatment method of subway deep foundation pit in karst intense development region

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] figure 1 As shown, it is a schematic diagram of the plane structure of the deep foundation pit treatment of the subway station, combined with figure 1 Schematic diagram of the structure taken along the line A-A figure 2 Let's see it together for more completeness and clarity. It can be seen from the figure that a three-dimensional treatment method for subway deep foundation pits in areas with strong karst development is characterized in that it adopts a three-dimensional construction method of karst cave / soil cave treatment + water-stop curtain + zoned grouting + bottom cover grouting.

[0024] The karst caves / soil caves are pretreated by filling and reinforcing the karst cave area 8 within 5m outside the foundation pit plane outline 13 and within 10m below the foundation pit bottom surface 17 before the excavation of the foundation pit.

[0025] T...

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Abstract

The invention discloses a three-dimensional treatment method of a subway deep foundation pit in a karst intense development region. The three-dimensional treatment method comprises the steps of karst cave / soil cave treatment; waterproof curtain construction; divisional grouting; and bottom sealing grouting. According to the three-dimensional stereo construction method, the foundation pit constriction safety and subway operation safety are guaranteed, the difficulty is low, the cost is low, the construction period is short, the method is the first one at home and abroad, the construction is convenient to organize, the construction procedure is scientific, the method is safe and reliable, the risks that a retaining structure collapses during construction and inrushing occurs in the foundation pit under the action of high-water head pressure confined karstic water are avoided, the capacity of the foundation pit for preventing partial karst collapse, the safety of a station structure, and the safety of subway operation are improved, and the method is applicable to karst treatment construction of the subway deep foundation pit.

Description

technical field [0001] The invention relates to a construction method of a foundation pit, in particular to a construction method of a subway deep foundation pit in an area with strong karst development. Background technique [0002] The Shizitang Station of Nanning Rail Transit Line 2 Project adopts a two-story underground single-column double-span box-type frame structure and is constructed by open-cut method. The total length of the foundation pit of the station is 209.8m, the thickness of the covering soil on the roof of the station is about 3.5m, the width of the foundation pit of the standard section is 19.7m, and the depth is about 18m. The surrounding structure of the foundation pit adopts the support form of ∅1000mm@1300 bored piles + inner support. The karst special and supplementary survey encounters a cave rate of 30.2%, and the linear karst rate is 3.8-42.9%, which belongs to the strong development of karst. The karst cave is 0.60-6.10m high, and it is general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12E02D17/02E02D19/18
CPCE02D3/12E02D17/02E02D19/18
Inventor 吕波杨宸何翔邓少闻杨钢锋
Owner CHINA CONSTR COMM ENG GRP UNITED
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