Combining the study characteristic and the current construction method of the bi - arch tunnel in domastic and aboard , the paper deeply study the three heading construction method and the benching tunneling construction method 结合目前国内外对双连拱隧道的研究特点以及国内外对双连拱隧道施工方法的现状，本文针对三导坑法和上下台阶法进行了较为深入的研究工作。
2.
Firstly , by the dynamical fem calculation about the above two construction method , the paper analyses the stress field and displacement field of the surrounding rock and the axial force and bending moment of the steel framework , specially analyses the most important member - the central wall and obtains the stress pattern during the different construction working procedure . after comparing the two methods , the paper considers the benching tunneling method is better 首先，运用有限元程序ansys对三导坑法和上下台阶法进行了动态数值模拟，分析了在不同施工工序下围岩体的应力场、位移场以及钢拱架的轴力和弯矩，尤其对双连拱隧道的核心构件?中隔墙进行了分析，得出了其在不同施工工序下的应力图。
3.
Using fem ( finite element method ) , the paper makes mechanical analyses on bench cut method and side heading method , it also makes mechanical analyses on some auxiliary construction methods , such as big pipe - roof protection , horizontal roll - spraying , big and small angle pipe - roof protection and surface grouting 论文采用有限元的分析方法，主要对台阶法、侧壁导坑法进行了力学分析，也选择了大管棚法、水平旋喷法、大小外插角管棚法和地表注浆加固四种辅助工法进行力学分析。
4.
The new applications of survey are described in the fields of indicating underground advance , seeking out lossed ore deposit , discovering neotype deposit for detecting the gold deposit ; determining productive aquifer for looking for groundwater ; discovering fracturation zone controlling crop out of hot spring for developing the hot spring , and locating the position of ancient rock slide for prospecting the earth slide 摘要综述了应用轻便测量技术在地矿及地下水寻找等方面的一些新应用，例如：在金矿勘探中指导坑道掘进，找到了被遗漏的矿体，发现了新的矿化类型；在地下水寻找中，确定了富水层位；在温泉开发中，探明了控制温泉出露的断裂带；在滑坡研究中，确定了古滑坡的具体位置。
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The paper introduces the progress and the statue quo of tunnel portal construction , discusses the condition to employ full face method , bench cut method , single side heading method and double sides heading method of portal construction , points out advantages and disadvantages of these methods . the order to adopt these methods of single track , double track and tri - track tunnel in shallow - depth , uneven pressure and incompact ground is also advised after compare 讨论了全断面法、台阶法、单侧壁导坑法和双侧壁导坑法在隧道洞口段施工中的使用条件和优缺点，对这四种施工方法从各个方面进行了比选，提出了单线、双线和三线隧道的洞口段处于浅埋、偏压、松散的地层中时各种施工方法选择的先后顺序。
