施工通道门型转换法进入地铁车站施工力学研究

Construction Mechanics of Construction Passage into Subway Station with Application of Door-Type-Conversion Method

以重庆市轨道交通10号线红土地车站为依托,采用有限元数值模拟和监控量测相结合的方法,分析门型转换爬坡法施工对施工通道和地铁车站交叉段围岩及支护结构稳定性的影响。分析结果表明:门型转换法的施工对转换段隧道围岩的位移和应力有较大影响;交叉段围岩竖向位移为8.3~10.7 mm;围岩最大主应力为7.92 MPa(压应力),最小主应力为0.64 MPa(拉应力);支护结构最大主应力为21.40 MPa(压应力),最小主应力为6.30 MPa(拉应力),最小主应力超过混凝土的抗拉强度,在施工过程中应该给予足够的重视。

Based on Hongtudi Station in line 10 of Chongqing rail transit,the method combing finite element numerical simulation with monitoring measurement was adopted.The influence of door-type-conversion climbing construction method on the construction passage and the stability of surrounding rock and supporting structure at intersection of subway station was analyzed.The results show that the construction of door-type-conversion method has great influence on the displacement and stress of the surrounding rock of the transition section.The vertical displacement of the surrounding rock at intersection is 8.3 mm^10.7 mm;the maximum principal stress of surrounding rock is 7.92 MPa(pressure stress)and the minimum principal stress is 0.64 MPa(tensile stress);the maximum principal stress of the supporting structure is 21.40 MPa(compressive stress)and the minimum principal stress is 6.30 MPa(tensile stress).The minimum principal stress exceeds the tensile strength of concrete,which should be paid enough attention in the construction process.