摘要
西安黄土地层中地铁盾构施工尚属首次,无现有的工程经验可借鉴,采用Peck公式对盾构施工段实测地表沉降进行预测时,得到沉降槽与实测结果差异较大,鉴于此因,利用APDL语言编制邓肯–张模型及有限元程序来追踪模拟盾构施工过程,对黄土邓肯–张参数、含水率及埋深等因素的变化引起的地层沉降进行量化分析,对黄土地层在盾构施工条件下引起的地表沉降进行相关的规律性研究和探讨,提出了地面沉降预测经验公式,并对某实测结果进行预测。结果表明预测公式能较好的反映西安黄土地层盾构施工引起地面沉降特性,具有一定的工程参考意义。
It is the first time to use EPB method in the subway construction in Xi’an loess strata.There is no better work experience for reference.The difference between the observed results and the Peck expressions is larger for the ground settlement trough.The real process of shield tunneling construction is simulated by FEM with Duncan-Chang model,which is programmed with APDL.The Duncan-Chang parameters,moisture content and depth of the tunnel axis are employed to perform quantitative analysis.The law of the ground settlement induced by subway construction with shield tunneling in Xi’an loess strata is studied,and an expressions is put forward to predict a certain measured ground settlement.It shows that the expression is suitable for the investigation of the ground settlement characteristics,and the conclusion is significant for similar projects with shield tunneling in Xi’an loess strata.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2010年第7期1087-1095,共9页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(50879068)
国家自然科学基金创新群体(40821001)
中科院冻土国家重点实验室项目(SKLFSE-ZY-03)
