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A Subgrade Structure for Dealing with Deep Soft Soil Karst Foundation

A karst and soft soil technology, applied in the field of roadbed structure, can solve the problems of not being able to meet the roadbed structure at the same time, achieve the goal of stability and deformation control, control post-construction settlement, and ensure stability

Active Publication Date: 2017-02-01
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no subgrade structure that can meet the above requirements at the same time.

Method used

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  • A Subgrade Structure for Dealing with Deep Soft Soil Karst Foundation
  • A Subgrade Structure for Dealing with Deep Soft Soil Karst Foundation
  • A Subgrade Structure for Dealing with Deep Soft Soil Karst Foundation

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:

[0015] Such as Figure 1~3 The roadbed structure shown for processing deep and thick soft soil karst foundations includes a karst layer 4, a hard soil layer 3 located above the karst layer 4, a soft soil layer located above the hard soil layer 3, and a layer laid on top of the soft soil layer 2. The cushion layer 8, the roadbed 1 laid on the top of the cushion layer 8, the soft soil layer 2 at the bottom of the cushion layer 8 (the cushion layer 8 is used to ensure the common force of the pile and soil to form a composite foundation) along the line Multiple rows of jet grouting piles 7 are provided. Each row of jet grouting piles 7 includes a plurality of jet grouting piles 7 arranged side by side. The bottom of each jet grouting pile 7 penetrates the soft soil layer 2 and is inserted into the hard soil layer. 3. (The bearing capacity of the hard so...

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Abstract

The invention discloses a roadbed structure for treating a deep soft soil karst foundation. The roadbed structure for treating the deep soft soil karst foundation comprises a karst layer, a hard soil layer located above the karst layer, a soft soil layer located above the hard soil layer, a cushion laid on the top of the soft soil layer and a roadbed laid on the top of the cushion, wherein multiple rows of chemical churning piles are arranged on the soft soil layer on the bottom of the cushion in the direction of a road, each row of chemical churning piles includes a plurality of chemical churning piles which are arranged side by side, the bottom of each chemical churning pile penetrates through the soft soil layer to be inserted into the hard soil layer, the top of each chemical churning pile is flush with the top surface of the soft soil layer and is connected with the bottom of the cushion, and an integrated grouting reinforcement area is formed by conducting pouring in the lower portion of the hard soil layer and the karst layer. According to the roadbed structure for treating the deep soft soil karst foundation, the stability of the deep soft soil karst foundation can be guaranteed, post-construction settlement of the foundation can be effectively controlled, and stability and deformation control of a high speed railway foundation in a deep soft soil karst area are achieved.

Description

Technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a roadbed structure for processing deep and thick soft soil karst foundations. Background technique [0002] The harm of soft soil foundation to roadbed is manifested in that the shear strength of the foundation is not enough to bear the weight and external load of the superstructure, and the roadbed is prone to partial or overall shear failure; in addition, the soft soil roadbed has high compressibility and acts on external loads. Subgrade will produce large post-construction settlement and uneven settlement, which will affect the normal operation of the roadbed. The hazards of karst foundations to subgrade engineering are generally manifested as subgrade collapse caused by cave roof collapse and subgrade settlement. It can be seen that both soft soil and karst foundation have stability and settlement problems to subgrade. To build high-speed railways on deep and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C3/04E02D27/16E02D3/12
CPCE01C3/04E02D3/12E02D27/16
Inventor 王祥金海元周宏元顾湘生姚成志谭远发冯光胜高山时风永罗和平李添翼陈世刚郭玲玲
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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