黏土中盾构开挖面变形及破坏数值模拟研究.pdf

第28 卷增刊 岩 土 力 学 Vol.28 Supp. 2007 年10 月 Rock and Soil Mechanics Oct. 2007 文章编号：1000－7598 －(2007) 增刊－0511 －05 黏土中盾构开挖面变形与破坏数值模拟研究 1 2 3 4 秦建设 ，虞兴福 ，钟小春 ，朱 伟 1. 31003 2. 310012 3. 210098 4. 210098 开挖面支护应力的控制是土压平衡式盾构施工成功的关键。利用能够考虑大变形破坏的拉格朗日有限差分计算程序， 对土压平衡式盾构在黏土地层施工中，因开挖面支护压力控制不当引起的开挖面的变形及破坏问题进行计算分析，探讨了开 挖面变形及破坏模式，分析了开挖引起的周围土体应力释放问题，为黏土地层中盾构开挖面控制压力的确定提供参考。 TU 433 A Numerical research on face movement and collapse of shield tunneling in silt ground 1 2 3 4 QIN Jian-she , YU Xing-fu , ZHONG Xiao-chun , ZHU Wei (1. Hangzhou Metro Co. Ltd. Hangzhou 310003, China; 2. Zhejiang Academy of Building Research Design Co. Ltd., Hangzhou 310012, China; 3. College of Civil Engineering, Hohai University, Nanjing 210098, China; 4. College of Environmental Science and Technology, Hohai University, Nanjing 210098, China) Abstract: The face support pressure control is a key operation during earth pressure balanced shield excavation. Three-dimensional fast Lagrangian differential finite element method can calculate the large strain of material, which is used to simulate the influence of face support pressure to face movement and collapse. Deformation and collapse pattern is discussed, and the soil stress release is analyzed due to shield excavation. Some useful results from numerical simulation are given for controlling face support pressure. Key words: earth pressure balanced shield; silt soil; face stability; support pressure; stress release 1 周围环境的影响降到最低程度。