Method of treating collapsible loess foundation by two-way spiral drill compaction process

The technology of collapsible loess and two-way spiral is applied in the field of treatment of collapsible loess foundation, which can solve the problems of shallow treatment depth, etc., and achieve the effect of good effect, good economic benefit and reduction of loess collapsibility grade.

Inactive Publication Date: 2017-12-19
LANZHOU ENG & RES INST OF NONFERROUS METALLURGY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for treating collapsible loess foundation by two-way auger compaction method, so as to solve the problem of shallow treatment depth existing in the existing method

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  • Method of treating collapsible loess foundation by two-way spiral drill compaction process
  • Method of treating collapsible loess foundation by two-way spiral drill compaction process

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] As shown in the figure, plain soil or lime soil (2) is filled in the hole (1), and the compacted loess foundation (3) is between adjacent holes (1).

[0022] The steps of the construction method are as follows:

[0023] (1) Positioning according to the pile position map to control the position of the pile;

[0024] (2) The two-way helical drill drills in place, and after reaching the design depth, reverse and lift the drill bit until the drilling is completed; the hole diameter d=400-600mm, and the hole spacing D= is controlled at 2d-3.5d.

[0025] The depth L of the borehole is determined according to the thickness of the loess layer and the depth of burial, and the deepest can be processed L=30 meters.

[0026] (3) Fill the hole with plain soil or lime soil (2), lift the slender hammer to do free fall to tamp the plain soil or lime soil until it re...

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Abstract

The invention belongs to the field of foundation treatment, and discloses a method of treating a collapsible loess foundation by a two-way spiral drill compaction process, in order to solve the problem that the treatment depth of an existing method is shallow. The method comprises the following steps that (1) payoff location is carried out according to a pile position diagram, and the positions of piles are controlled; (2) a two-way spiral drill is adopted for drilling; (3) holes are filled with plain soil or ash soil, and ramming is carried out till the plain soil or the ash soil reaches the surface of a foundation; and (4) the step (2) and step (3) are repeated till field treatment is completed. The treatment depth can reach 30m by the method, the method is suitable for the foundation treatment of large-thickness collapsible loess, no soil is discharged in the hole-forming process, the effect of the compaction foundation is good, the loess collapsible level can be reduced effectively, and even the loess collapsibility can be eliminated.

Description

technical field [0001] The invention belongs to the field of foundation treatment, in particular to a method for treating collapsible loess foundation. Background technique [0002] The collapsible loess foundation has loose soil structure and developed voids, and its strength decreases rapidly after being exposed to water, and its collapsibility is serious. [0003] The existing hole-forming and compacting method for treating soft ground can only treat the ground at a maximum depth of 10+0.3 meters, which is not suitable for collapsible loess ground with a relatively large thickness. [0004] The existing treatment methods for collapsible loess foundations involve dynamic tamping, water injection, and vibration or hammering. Applicability and scope are affected. Contents of the invention [0005] The purpose of the present invention is to provide a method for treating collapsible loess foundation by two-way auger compaction method, so as to solve the problem of shallow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/08
CPCE02D3/08E02D2300/0037
Inventor 陈天镭李旭东蔡明喜王兆辉牛梦实柴清丁东彦赵星芸
Owner LANZHOU ENG & RES INST OF NONFERROUS METALLURGY
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