复合地层中隧道开挖面支护压力对地层变形的影响  

Influence of Support Pressure at Face of Shield Tunnels in Composite Strata on the Ground Deformation

作　　者：资谊[1] 陈强[2] 章荣军[2] 郑俊杰[2] 

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《华中科技大学学报（城市科学版）》2010年第4期36-41,共6页Journal of Huazhong University of Science and Technology

摘　　要：建筑物密集区域对变形控制相当严格,隧道开挖面合理支护压力往往不由极限支护压力确定,而是由地层变形控制标准来确定,因此有必要探讨开挖面支护压力与地层变形之间的内在关系。针对广州地区典型的上软下硬复合地层条件,考虑盾构的实际掘进过程,研究了欠压状态下开挖面前方土体的位移模式,并分析了不同条件下开挖面支护压力与地层变形之间的内在关系。结果表明,当土体性质不同时,欠压状态下开挖面前方土体表现出不同的位移模式;不同埋深情况下开挖面极限支护压力比基本相同;土体内摩擦角及黏聚力对开挖面所需的合理支护压力大小的影响显著。In urban areas where the deformation control standard is very strict, the support pressure at excavation face of shield tunnels is determined by the control standard of the soil deformation in most cases, not by the limit support pressure. Thus, it is necessary to carry out some further research on the internal relationship between the face support pressure and the soil deformation. In this paper, focusing on the typical composite strata that the upper stratum is soft and the lower stratum is hard in Guangzhou area, the displacement pattern of the soil in front of the excavation face under the under-pressure condition was studied. Then, considering the actual advancing process of the shield machine, the internal relationship between the face support pressure and the soil deformation was discussed in details. The calculated results indicate that when the soil characteris- tics are different, the displacement patterns of the soil in front of the excavation face are different. For different buried depths, the limit support pressure ratios are basically identical. The influence of the soil cohesion and the friction angle on the value of the rational support pressure is significant.

关 键 词：盾构隧道 开挖面稳定 支护压力 土体变形 位移模式 

分 类 号：U451[建筑科学—桥梁与隧道工程]