【摘要】 采用弹粘塑性有限元分析方法模拟了家竹箐隧道施工全过程，确定了各施工阶段洞壁位移、围岩塑性区范围、支护和补砌的应力和内力，从而评估了既有隧道的结构安全度和达到稳定状态所需要的时间更多还原

【Abstract】 The whole construction courses of Jiazhuqing tunnel were simulated by using the theory of viscoplasticity and finite element.The displacements of tunnel wall,the plastic areas of surrounding rock mass and the stress and internal force of support and liner were defined in each construction course.Then the safety degree of structure and the time that was needed when the structure tended bowards stability were appraised.更多还原