基于FLAC3D的膨胀土地区加锚双排桩支护结构数值分析

Numerical Analysis of Anchored Double Row Pile Support Structure in Expansive Soil Area Based on FLAC3D

以成都市膨胀土地区某深基坑工程的加锚双排桩支护结构为研究对象,依托基坑工程实例采用数值模拟作为手段,通过引入强度折减法对内摩擦角与黏聚力进行折减,对加锚双排桩支护结构采用实体单元进行模拟,以此来对加锚双排桩整体水平位移展开深入研究。结果表明,随着内摩擦角与黏聚力的减小,桩身水平位移增大,且降幅随内摩擦角与黏聚力的减小而增大。因此,在实际设计中要充分考虑膨胀土特性对加锚双排桩支护结构的影响,要结合相关规范及膨胀率试验进行一定程度地内摩擦角与黏聚力强度折减。

Taking the anchored double row pile support structure of a deep foundation pit project in the expansive soil area of Chengdu as the research object, relying on the example of foundation pit project,using numerical simulation as the means, the internal friction angle and cohesion are reduced by introducing the strength reduction method, and the solid element is used to simulate the anchored double row pile support structure, In this way, the overall horizontal displacement of anchored double row piles is deeply studied. The results show that the horizontal displacement of pile increases with the decrease of internal friction angle and cohesion, and the decrease amplitude increases with the decrease of internal friction angle and cohesion Therefore, in the actual design, the influence of expansive soil characteristics on the supporting structure of anchored double row piles should be fully considered, and the internal friction angle and cohesion strength should be reduced to a certain extent in combination with relevant codes and expansion rate experiments.