在湿法刻蚀诱导坑时，需适当延长刻蚀时间。
中墙轴力随中导坑的扩大而减小，其中中导坑宽度影响较大；
The axial force of middle wall decreases with the increase of the middle heading, the width of middle heading influences greater.
介绍东秦岭特长隧道工程正洞及平行导坑的设计标准、施工技术要点。
Design code and key technical points for main tunnel and parallel heading of East Qinling Super-long Tunnel are introduced.
从总体上分析结果可知，双侧壁导坑法更适合于双向八车道连拱隧道施工。
It can be concluded that from overall analysis the double-side-drift method is more suitable than the CRD method in multiple-arch tunnel with eight traffic lanes.
本文介绍北京地铁西单车站一号施工横通道，与正洞导坑交接处开口段结构静载模型试验情况。
This paper deals with a structure model test under static load to study the stress characteristics of the structure.
本文介绍北京地铁西单车站一号施工横通道，与正洞导坑交接处开口段结构静载模型试验情况。
This paper deals with a structure model test under static load to study the stress characteristics of the structure.
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