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Construction method for reinforcing newly-built railway karst foundation and roadbed structure thereof

A construction method and karst technology, applied in infrastructure engineering, roads, buildings, etc., can solve the problems of poor control of post-construction settlement, uneconomical, and large-scale promotion and use, and achieve foundation reinforcement structure and construction The process is not complicated, the effect of improving the bearing capacity of the foundation and reducing the uneven settlement of the foundation

Active Publication Date: 2016-06-22
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The padding method is mainly suitable for exposed karst and shallow buried karst, but not for covered karst and deep buried karst; grouting method is the most commonly used karst treatment method, but it can only ensure the stability of karst foundation, and cannot Good control of post-construction settlement; the high-pressure rotary spraying method has high requirements for construction technology, construction machinery and equipment, and materials, including construction experience, and is not economical, so it has not been widely used

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  • Construction method for reinforcing newly-built railway karst foundation and roadbed structure thereof
  • Construction method for reinforcing newly-built railway karst foundation and roadbed structure thereof
  • Construction method for reinforcing newly-built railway karst foundation and roadbed structure thereof

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as figure 1 As shown, the present invention provides a subgrade structure for strengthening and treating the karst foundation of a new railway, where the karst foundation structure includes a karst layer 4, a hard soil layer 3 above the karst layer 4, and a soft soil layer 2 above the hard soil layer 3 , the subgrade structure includes a slab girder 8 arranged on the top of the soft soil layer 2, a subgrade 1 laid on the top of the slab girder 8, the slab girder 8 is arranged longitudinally along the line and symmetrically arranged laterally with the center line of the line, and the center line of the line is the center line of the subgrade, The transverse ends of the plate girder 8 are respectively located between the road shoulder and the toe of the same side of the subgrade 1 (such as the left lateral end of the plate g...

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Abstract

The invention discloses a construction method for reinforcing a newly-built railway karst foundation and a roadbed structure thereof. The construction method comprises the steps of longitudinally constructing a plurality of rows of cast-in-situ bored piles along the railway line, wherein the cast-in-situ bored piles are formed through pouring reinforced concrete on site; longitudinally paving a plate girder prefabricated through reinforced concrete along the railway line above the cast-in-situ bored piles and at the top of a soft soil layer, wherein the tops of the cast-in-situ bored piles and the bottom of the plate girder are fixedly connected to form a pile plate structure; carrying out pressure grouting on the connection part of a hard soil layer and a karst layer of the karst foundation on the two sides of the pile plate structure, so as to form a longitudinal continuous grouting reinforcement zone along the railway line; and when the grouting reinforcement zone solidifies, paving a roadbed at the top of the plate girder. According to the roadbed structure provided by the invention, the karst foundation and an upper soil covering layer are reinforced, so that the foundation bearing capacity is improved, and the post-construction settlement of the roadbed is effectively controlled.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a construction method for reinforcing and treating karst foundations of newly-built railways and a subgrade structure thereof. Background technique [0002] Karst is a variety of geological forms, functions and phenomena produced by soluble rocks such as limestone and dolomite under the long-term dissolution of water. The main forms of deformation and failure of karst foundation include insufficient foundation bearing capacity, uneven settlement, foundation sliding, and surface collapse. With the development of social economy, railway construction is getting faster and faster, and more and more railway projects are carried out in karst areas. The smoothness and stability of subgrade structure are directly related to the safety of railway operation. Control has extremely strict requirements. Therefore, when building high-speed railways on karst foundations, it is necessar...

Claims

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Application Information

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IPC IPC(8): E01B2/00E02D5/34
CPCE01B2/006E02D5/34
Inventor 王祥晏军陈占顾湘生熊林墩李小和倪岳艳席亚丽赵新益熊朝辉田浩萍李添翼陈世刚王勇刚杨松
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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