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Method for improving collapsible loess in northwest arid regions

A technology for collapsible loess and regions, applied in the directions of roads, road repair, roads, etc., can solve the problems of easy depression of roadbed, difficult control of ash mixing amount and ash uniformity, poor improvement of collapsible loess, etc. Sag, achieve the uniformity of ash mixing and water content, and ensure the effect of compaction

Inactive Publication Date: 2020-07-14
中铁二十五局集团第二工程有限公司
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Problems solved by technology

For the above problems, the traditional improvement method is through ash mixing. However, it is very difficult to control the amount of ash mixing and the uniformity of ash mixing, and the water content is also the key to controlling the degree of compaction. It is very easy to cause poor improvement of collapsible loess, and the roadbed is easy to sag.

Method used

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Embodiment Construction

[0011] A method for improving collapsible loess in the arid area of ​​Northwest China, comprising the following steps: (1) In order to ensure that the various indicators of the filling layer are qualified, before the cement-soil filling construction, the degree of compaction, flatness, width, longitudinal Check and accept the high-rise and transverse slopes, and measure the placement positions of the middle piles and side piles. According to conventional technical means, the side piles should be 30cm~50cm wider than the width of the subgrade for filling. In this embodiment, the ratio of side piles to the subgrade For filling with an extra width of 50cm, white ash is used to scatter the control line according to the width of the roadbed, so that the width of the roadbed reaches the designed filling width; The thickness of the soil is used to determine the grid size. The calculation method of the grid size is as follows: 24m per vehicle 3 , the thickness of loose plain soil is 0...

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Abstract

The invention relates to a method for improving collapsible loess in the northwest arid regions. The ash mixing amount and the water content are controlled in the mode that a powder spreading vehicleand a cold regenerator are connected with a watering cart, ash mixing uniformity and the water content can be effectively controlled, the compactness, the flatness and the like of a roadbed are guaranteed, and that the roadbed is not prone to sinking when collapsible loess is used is guaranteed.

Description

technical field [0001] The invention relates to a method for improving collapsible loess in the arid area of ​​northwest China. Background technique [0002] Collapsible loess is widely distributed in Northwest my country, especially in the loess plateau landform area, where the loess structure is loose, with well-developed vertical joints, large pores, typical pore structure, and obvious characteristics of water-immersion and collapsibility. For the above problems, the traditional improvement method is to add ash. However, it is very difficult to control the amount of ash and the uniformity of ash, and the water content is also the key to control the degree of compaction. It is very easy to cause poor improvement of collapsible loess, and the roadbed is easy to sag. . Contents of the invention [0003] The invention aims to provide a method for improving collapsible loess in the arid area of ​​Northwest China, which can effectively control the amount and uniformity of as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/04E01C21/00
CPCE01C3/04E01C21/00
Inventor 刘湘缪达健王奕文冯永刚徐敦敏黄程丁健韦庆武
Owner 中铁二十五局集团第二工程有限公司
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