开挖速率对软黏土深基坑时间效应的影响分析.pdf

施工技术 2016年4月上 62 CONSTRUCTION TECHNOLOGY 第45卷第7期 D0I:10.7672/8js2016070062 开挖速率对软黏土深基坑时间效应的影响分析* 王志鹏12，冯怀平，张良3 (1.石家庄铁道大学土木工程学院，河北石家庄050043；2.铁道第三勘察设计院集团有限公司，天津300142； 3.河北建设勘察研究院有限公司，河北石家庄050043) [摘要]基于流固耦合的基本控制方程，编制了相应的可以考虑时间效应的程序，通过某深基坑的验算，对不同开 挖速率、地表沉降和桩顶位移、桩后土体超孔隙水压和有效应力、应力路径变化情况进行了分析，结果表明开挖速 率大的基坑其坑侧土体应力先达到土体的抗剪强度而破坏，建议在实际工程中易采用分层开挖的方法进行施工. [关键词]深基坑；流固耦合；时间效应；位移；应力；有限元分析 [中图分类号]TU411.2 [文献标识码]A [文章编号]1002-8498(2016)07-0062-04 Analysis on Time Effect of Soft Clay Deep Foundation Excavation Under Different Excavation Rate Wang Zhipeng.2 Feng Huaiping' Zhang Liang' (1.School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang Hebei 050043 China; 2.Third Railway Surzey and Design Institute Group Corporation Tianjin 300142 China; 3.Hebei Research Institute of Construction Geotechnical Investigation Shijiazhuang Hebei 050043 China) Abstract:A program which is based on the governing equation of fluid-solid coupling has been pleted to calculate deep foundation excavation.An engineering example of deep foundation excavation is taken for calculation.The effect of different excavate rate on surface settlement displacement of pile top excess pore-water pressure of the soil which behind the pile and effective stress were analyzed.The results show that the high excavation rate makes soil stress easy to reach the soil shear strength and failure layered method of excavation should be adopted in practical engineering. Key words:deep foundation excavation;fluid-solid cou...