岩土工程学报2024，Vol.46Issue(z1)：6-10,5.DOI:10.11779/CJGE2024S10003
开挖面失稳导致地下结构变形破坏的离心模拟
Centrifuge tests on deformation and failure mechanism of existing structures induced by displacements of excavation face
摘要
Abstract
The development of cities often involves the construction of new tunnels underneath densely distributed existing structures.When the tunnels experience complicated and difficult conditions,failure may occur at the tunnel face and pose great threat to the existing structures.The results of three centrifuge tests to simulate existing structures in a uniform silt and in the silt with a 4 m thick clay layer are introduced.A technique is developed to simulate the instability of the excavation face and reproduce the failure mode.The tests show that when the displacement of the excavation face is controlled(0.48H,where H is the excavation height)or there is a clay interlayer near the excavation surface,soil arching is formed to confine the failure and reduce the deformation and strain of the existing tunnel.When the displacement of the excavation face increases to 0.83H,an overall collapse is trigged and induce significant deformation and strain on the existing tunnel.关键词
地下工程结构群/隧道开挖面失稳/变形破坏机理Key words
existing structure/instability of tunnel face/deformation and failure mechanism分类
土木建筑引用本文复制引用
张建红,王爱霞,陈湘生..开挖面失稳导致地下结构变形破坏的离心模拟[J].岩土工程学报,2024,46(z1):6-10,5.基金项目
国家自然科学基金项目(52090084,52279101) （52090084,52279101）
