红层软岩隧道CRD法进洞施工合理工序研究  

Study on Reasonable Construction Process in Entrance Section of Red Layer Soft Rock Tunnel with CRD(Cross Diaphragm) Method

作　　者：陈国中 徐前卫[2] 程盼盼[2] 董继涛 吴永波 

机构地区：[1]中铁七局集团第二工程有限公司,陕西西安710032 [2]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《铁道建筑》2016年第8期69-72,82,共5页Railway Engineering

摘　　要：南华一号隧道进洞施工采用CRD法,但在按照原设计工序施工时,出现了开挖面失稳、局部塌方等事故,影响施工安全和施工进度。本文采用数值模拟方法从隧道施工围岩的变形、塑性区分布规律、初期支护结构的受力特点等方面对CRD法施工的合理工序进行了研究。结果表明:采用左上、右上、左下、右下步序施工,围岩的变形可以得到有效的控制,从而更有利于围岩的稳定。围岩变形实测数据与数值模拟结果相吻合,表明数值计算分析是正确的。Nanhua No. 1 tunnel entrance section was constructed by using CRD method. Excavation instability and partial collaps occurred during the construction followed the designed construction process,resulting in a safety threat and a delay. In this paper,a reasonable construction was suggested by using CRD method based on a numerical simulation. The deformation of surrounding rock,plastic zone distribution and performance of initial support were analyzed. The results show that deformation of surrounding rock can be effectively controlled through an improved process,a construction starting at the upper left part,then at upper right part,the lower left part and finally at the lower right. The advantage of this construction method is an effective control of stability of surrounding rock. The numerical simulation was validated by the field measurement.

关 键 词：软岩隧道 CRD法 施工顺序 数值模拟 现场监测 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]