Method for reducing swelling power of swelling soil by combining physical improvement and loads

A technology of expansive soil and expansion potential, which is applied in the field of physical improvement and load combined to reduce the expansion potential of expansive soil, can solve problems such as engineering insecurity, and achieve the effect of ensuring safe use, obvious economic and social benefits, and stable performance.

Active Publication Date: 2016-12-14
SOUTHEAST UNIV
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  • Abstract
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Problems solved by technology

Therefore, this simple modification in water conservancy projects is very unsafe for the project, and there are hidden dangers

Method used

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Embodiment Construction

[0018] The establishment method of the present invention is as follows:

[0019] a. Find out the burial depth and thickness of the expansive soil on the site, and the expansive force of the expansive soil;

[0020] b. Determining the particle gradation of expansive soil, mainly to find out the content of clay particles (particle size less than 5 μm);

[0021] c. According to the stable load of the upper structure and the expansion potential of the expansive soil, determine the improvement plan of the expansive soil;

[0022] c1) For the case where the stable load of the upper structure is less than 1 / 3 of the expansive soil expansion force and the clay content exceeds 55%, after physical improvement, the clay content of the improved expansive soil is less than 30%. Add silt and fine sand, plus 2% quicklime to participate in the improvement; for example, the expansive soil in Huai'an Section 1 of Ninghuai Expressway has a clay content of 60%, and the expansion force of the exp...

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Abstract

The invention discloses a method for reducing swelling power of swelling soil by combining physical improvement and loads. According to the specification, the swelling soil can not be used for filling engineering and needs to be replaced with non-swelling soil, and therefore the swelling soil is abandoned and resources are wasted. The method comprises the following steps that a, the depth, thickness and the swelling power magnitude of the swelling soil in a specific site are found out; b, the grain composition of the swelling soil is measured, and mainly the clay content of the swelling soil is found out; c, a scheme for improving the swelling soil is determined according to the stable load magnitude of an upper structure and the swelling power magnitude of the swelling soil; d, even mixing is required in the process of physical improvement on the swelling soil, and the swelling soil is pulverized by a soil pulverizer and mixed with silty-fine sand; and e, the improved swelling soil needs to be subjected to rolling compaction layer by layer to reach the compactness of 90% or above, and in this way, combined with the load of the upper structure, an impermeable layer is well arranged at the bottom of the upper structure so that the swelling power and swelling-shrinking deformation of the swelling soil can be effectively controlled. The swelling soil is sufficiently utilized, and abandonment of the swelling soil is avoided.

Description

technical field [0001] The invention is used for the construction of highways, railway projects and house construction projects in expansive soil areas. This technology can better protect and prevent expansive soil from being discarded due to expansion and contraction deformation, and save land resources. Background technique [0002] It has been found that there are a large amount of expansive soil distributed in more than 20 provinces and autonomous regions in my country. Expansive soil is a special kind of soil that absorbs water, expands, dehydrates and cracks, causing slope instability over and over again; embankment collapse affects the normal operation of roads and railways; embankment landslides Blocking the river course affects navigation and flood relief; it causes light buildings to crack or even collapse, causing huge losses to life and property. [0003] The expressway, railway embankment and housing construction in the expansive soil area are usually modified by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00E02D3/02
CPCE02D3/00E02D3/02
Inventor 缪林昌陈艺南王非
Owner SOUTHEAST UNIV
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