深基坑工程开挖安全性的数值分析
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摘要
采用数值模拟手段对某基坑采用已定开挖方法及支护方式情况下的基坑安全性问题进行了探讨,全面分析了基坑在开挖过程中的土体位移、已有基础沉降、连续墙及锚杆受力。计算结果表明:该基坑侧壁土体的最大水平位移和垂直位移分别仅为1.50 cm和1.29 cm;已有建筑物基础底面在开挖过程中有升有降,连续墙在水平方向上的位移随深度延伸有时增加有时减小,呈现非单调的变化规律。由于这些量的值在数值都较小,因此可以认为在基坑开挖过程中,基坑支护体系和该已有建筑物均是安全的。
The numerical simulation method was adopted to analyze the safety of foundation pits with the planned excavation methods and support styles,including the soil displacement,settlement of the existed base,force of the diaphragm walls and bolts.The calculated results show that the horizontal and vertical displacements of side walls of the foundation pits are 1.50 cm and 1.29 cm respectively.The bottom of the existing building sometimes ascends and sometimes falls.The horizontal displacement of the diaphragm walls sometimes increases and sometimes decreases with the extension of the depth,which does not show monotonicity in variation law.Because these values are small,it can be deduced that the support system and the existed building are both safe.
The numerical simulation method was adopted to analyze the safety of foundation pits with the planned excavation methods and support styles,including the soil displacement,settlement of the existed base,force of the diaphragm walls and bolts.The calculated results show that the horizontal and vertical displacements of side walls of the foundation pits are 1.50 cm and 1.29 cm respectively.The bottom of the existing building sometimes ascends and sometimes falls.The horizontal displacement of the diaphragm walls sometimes increases and sometimes decreases with the extension of the depth,which does not show monotonicity in variation law.Because these values are small,it can be deduced that the support system and the existed building are both safe.
引文
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[2]李大勇,龚晓南,张士乔.软土地基深基坑周围地下管线保护措施的数值模拟[J].岩土工程学报,2001,23(6):736–740.(LI Da-yong,GONG Xiao-nan,ZHANG Tu-qiao.Numerical simulation of the buried pipelines protection adjacent to deep excavation[J].Chinese Journal of Geotechnical Engineering,2001,23(6):736–740.)
[3]范秋雁,陈波,沈冰.考虑施工过程的基坑锚杆支护模型试验研究[J].岩土力学,2005,26(12):1874–1878.(FAN Qiu-yan,CHEN Bo,SHEN Bing.Model test research of bolt supporting of foundation pit considering construction process[J].Rock and Soil Mechanics,2005,26(12):1874–1878.)
[4]吴恒,周东,李陶深,等.深基坑桩锚支护协同演化优化设计[J].岩土工程学报,2002,24(4):465–470.(WU Heng,ZHOU Dong,LI Tao-shen,et al.Co-evolution optimization of anchored piles in row for deep foundation pit[J].Chinese Journal of Geotechnical Engineering,2002,24(4):465–470.)
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