干砂盾构开挖面稳定性模型试验研究  

Large-scale tests on face stability of shield tunnelling in dry cohesionless soil

作　　者：陈仁朋[1,2] 李君[1,2] 陈云敏[1,2] 孔令刚[1,2] 

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310058 [2]软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《岩土工程学报》2011年第1期117-122,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50629802);国家重点基础研究发展计划(2007CB714001);教育部新世纪优秀人才支持计划资助项目(NCET-08-0491)

摘　　要：盾构技术在地下空间开发中得到广泛应用,保持开挖面稳定性是盾构施工的关键,但这方面的大尺寸模型试验研究一直很少。利用直径1 m的盾构模型,研究了干砂地层中不同埋深比(C/D=0.5,1.0,2.0)下盾构开挖面稳定性问题。试验中分析了埋深比对开挖面极限支护力及地表沉降的影响,揭示了开挖面稳定性与极限支护力及地表沉降的关系,提出同时监测控制开挖面土舱压力及地表沉降的重要性,并给出关键控制键参数。对确定开挖面极限支护压力有重要的指导意义。The shield technology has been widely used in underground construction.The face stability is the key problem in the shield tunneling.Large-scale model tests on the face stability of tunnels with the ratios of tunnel depth to diameter C/D = 0.5,1.0 and 2.0 are conducted in the dry sand.The influence of C/D on the ultimate support pressure and the settlement of ground surface are obtained.The support pressure decreases sharply with the increase of the face displacement.However,the settlement of the ground surface is not sensitive to the support pressure before the residual support pressure.Both the support pressure and the ground settlement are essential to the monitoring of the face stability in the shield tunnelling.

关 键 词：模型试验 盾构 开挖面稳定性 极限支护力 土拱效应 

分 类 号：TU41[建筑科学—岩土工程]