钻孔灌注桩孔壁稳定性分析

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Abstract By the methods of finite element numerical simulation and finite element strength reduction，the influences of soil properties，relative density of mud，hole depth and hole radius on the stability of bored pile hole-wall are analyzed. The analysis results are shown as follows：(1) The major problem of stability of bored pile hole-wall in clay is hole shrinkage. The poorer the properties of clay are or the deeper and bigger the hole are，more serious the phenomenon of hole shrinkage is. The dense mud can reduce the size of hole shrinkage effectively. (2) The major problem of stability of bored pile hole-wall in sand is collapsing and the relative density of mud is the major influencing factor. When plastic zones appear in the hole-wall soil，the soil is easy to be destroyed and the failure will spread to all around the plastic zone；finally，the hole collapses. In order to prevent collapsing，the relative density of mud should be heavy enough to make sure the lateral pressure of mud is not less than static lateral pressure of soil. The research results can provide references for the design and construction of bored piles in soft soil.

Key words： pile foundations bored pile stability of hole-wall finite element strength reduction method hole shrinkage collapsing

Received: 24 February 2011

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http://www.rockmech.org/EN/Y2011/V30/IS1/3281

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