Combined treatment construction method for collapsible loess foundation

Abstract

The invention relates to a combined treatment construction method for a collapsible loess foundation. The method comprises the following steps of firstly, performing impacting and pretreatment on a collapsible loess land by using a conical pounder and treating the foundation; secondly, expanding lime-soil compaction piles by using a drilling ram and performing pile repairing and reinforcing; and finally, performing post grouting construction on cast-in-place piles. The combined treatment construction method for the collapsible loess foundation has the advantages that the method is economical and environment-friendly; the treatment depth is great; the treatment effect is high; the bearing potential is high; and the complicated load resistance is high. By using the method, various negative effects caused by collapsibility of a deep and thick collapsible loess land can be eliminated, and requirements of an upper high-rise building on the bearing capacity and the sedimentation of the foundation can be met.

Description

technical field [0001] The invention relates to a foundation construction method, in particular to a combined treatment construction method for collapsible loess foundations. Background technique [0002] The processing method of traditional collapsible loess foundation in the prior art mainly contains the following methods: (1) cushion layer, (2) heavy hammer surface compaction, (3) dynamic compaction, (4) compaction pile, (5) chemical Reinforcement, (6) pre-soaking, (7) pile foundation. Among the above treatment methods for collapsible loess foundations, method (1) and method (2) have shallow treatment depths and are not suitable for sites with deep collapsible loess; method (3) has a large negative impact on the environment and is not suitable for existing It is used around buildings and in urban areas; method (4) uses a single filler, and the compaction effect on the soil between piles is not ideal, and can only eliminate foundation collapsibility to a limited extent; m...

AI Technical Summary

Problems solved by technology

Among the above treatment methods for collapsible loess foundations, method (1) and method (2) have shallow treatment depths and are not suitable for sites with deep collapsible loess; method (3) has a large negative impact on the environment and is not suitable for existing It is used around buildings and in urban areas; method (4) uses a single filler, and the compaction effect on the soil between piles is not ideal, and can only eliminate foundation collapsibility to a limited extent; method (5) is expensive to deal with, and is generally not accepted Adoption; method (6) subsidence and cracking of the ground surface around the site when soaked in water, and easily cause "running water" to penetrate holes, affecting the safety of surrounding buildings; method (7) is used to deal with deep collapsible loess areas, especially in self-weight collapsible areas In the permanent loess site, in order to overcome the adverse effects of negative friction, the required piles are long and the economy is poor

Among the above treatment methods for collapsible loess foundations, especially in sites with deep self-weight collapsible loess near existing buildings, there is no economical and effective foundation treatment method that can meet the requirements of high-rise buildings for foundation bearing capacity and settlement. Require

Images