摘要
该文以某地铁隧道基坑工程为背景,采用flac3D三维有限差分软件建立数值分析模型,对基坑施工的全过程进行了工况动态模拟,分析研究了基坑采用水泥土搅拌桩和水泥土搅拌桩联合抗拔桩两种加固方案时下卧地铁隧道的位移和应力特点,并将二者分析结果进行了对比。水泥土搅拌桩联合抗拔桩方案相对于水泥土搅拌桩方案更好的抑制了隧道回弹量,降低了隧道应力,增强了隧道的安全性。其成果可为优化设计及施工提供有益的参考和借鉴。
This paper takes the foundation pit engineering of a metro tunnel for background. Using the flac3 D software to build the numerical analysing model,the engineering dymatic simulation of the whole process of foundation pit construction is made. The displacement and stress characteristics of the two reinforcement schemes for the foundation pit by cement-soil mixing pile and cement-soil mixing pile associate with uplift piles are studied and analysed. And the results of the two methods are compared and analyzed.The results showed that： The cement-soil mixing pile associating with uplift pile can restrain the rebound of tunnel better than the cement-soil mixing pile. The stress of tunnel is reduced,and the tunnel safety is added. The results can provide the beneficial reference for optimization design and construction.
出处
《勘察科学技术》
2016年第3期47-50,59,共5页
Site Investigation Science and Technology
关键词
基坑
下卧地铁隧道
水泥土搅拌桩
抗拔桩
竖向位移
主应力
foundation pit
subjacent metro tunnel
cement-soil mixing pile
uplift pile
vertical dis placement
principal stress
