膨胀岩土地层修建盾构隧道引起的局部膨胀荷载研究  

Partial Expansive Load Induced by Shield Tunneling in Expansive Ground

作　　者：方勇[1] 崔戈[1] 符亚鹏[1] 何川[1] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《重庆交通大学学报（自然科学版）》2013年第4期636-638,640-641,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(51278422);高铁联合基金项目(U1134208);国家科技支撑计划项目(2012BAG05B03);国家"973"计划项目(2010CB732105);四川省青年科技基金项目(2012JQ0021);中央高校基本科研业务费专项资金项目(SWJTU11ZT33)

摘　　要：从理论上推导了岩土局部膨胀引起的附加膨胀荷载计算公式;结合数值分析方法,研究了不同位置、不同范围发生地层局部膨胀对衬砌结构接触压力增量的影响。结果表明:膨胀荷载与岩土膨胀力大小、应力水平、地层抗力、膨胀后岩土物性参数等因素有关,因地层局部膨胀引起的衬砌结构承受附加膨胀荷载值小于室内测得的膨胀力;岩土吸水膨胀后,地层抗力显著降低,对地层膨胀区及影响区隧道衬砌结构承受的荷载分布产生显著影响;若膨胀力较小,吸水后软化作用强于膨胀作用,会导致衬砌承受的荷载减小。The equation of additional load caused by partial ground expansion is deduced theoretically.The influence of partial expansion at various positions with different range on the contact pressure of tunnel structure is studied by numerical method.The results show that expansion load is related with the expansive force,stress,ground resistance and material parameters of expanded soil.Generally,the load of partial ground expansion added to the pressure on tunnel structure is less than the expansive force obtained by indoor test.Water swelling of the soil will significantly reduce the ground resistance and influence the load distribution of shield tunnel structure around expansion zone.Small expansive force will reduce the load on tunnel structure because of strong softening and weak expansion after the saturation.

关 键 词：膨胀地层 盾构隧道 膨胀力 衬砌结构 膨胀荷载 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]