大跨度输水洞穿高速浅埋暗挖方案模拟比选研究

利用非线性有限元程序，对三跨拱涵开挖施工方案进行模拟。通过对两种较为可行的施工方案进行模拟，比较了开挖引起的地表沉降、衬砌的应力变化和洞周土体的塑性区等因素，综合考虑后利用模糊评判选出了优选方案。同时，由模拟的数据还发现了隧洞开挖时容易出现的各种危险情况，建设施工单位在危险区域采取适当的措施，得到很高的实际价值，对今后类似工程有借鉴意义。

Project optimization of superficial layer shading excavation of large-span diversion calvert through speedway

Projects of excavation constructions of triple-span arch culvert are simulated using nonlinear finitee element analysis program. After two feasible construction projects are simulated, ground surface settlement, stress change of liner, plastic zone of surrounding soil and so on in the one project are relatively compared with those in the another project. An optimized project is then selected by using fuzzy evaluation after comprehensive consideration. Various risk situations in tunnel excavations are found from the simulation data, which reminds construction unit to adopt relevant provision for the risk area, has achieved high application value and can be used in similar construction for reference.