pilot tunnel

In many projects , like the Simplon , for example , a small pilot tunnel is driven before the full diameter of the tunnel is excavated .

在许多隧道工程中，经如辛普龙大隧道，都要在隧道全面开挖前打一个导洞。

Monitoring result shows that , after the heading-through of the central pilot tunnel , construction is organized firstly on the pilot tunnel of the shallow-buried side .

监测结果表明：中导洞形成后，浅埋侧导洞先行施工，其围岩变形较深埋侧导洞要大；

Discussion on the Combined Construction Method with Pilot Tunnel and Bench for Large Cross-Section Tunnel

导硐台阶联合法在大断面隧道施工中的探讨

Discussion on the Two Side-wall Pilot Tunnel Method

双侧壁导坑隧道工法技术探讨

Design of Field Simulation Pilot Tunnel for High Pressure Reinforced Concrete Bifurcations for Guangzhou Pumped Storage Station

广州蓄能电站高压钢筋砼岔管现场模拟试验洞设计

Applying pilot tunnel to treat tunnel collapse

采用小导坑处理隧道坍方

Study of the Pilot Tunnel Drift Method Technology in Deeply Buried Large Cross Section Chambers of Composite Soft Rock

深埋复合型软岩大断面硐室导硐法施工及支护技术研究

Field simulation pilot tunnel for high pressure reinforced concrete bifurcations is a large-sized scientific research item for Guangzhou Pumped Storage Station .

广州抽水蓄能电站高压钢筋砼岔管现场模拟试验洞是一项大型的试验科研项目，它主要为广州抽水蓄能电站高压钢筋砼岔管服务。

Nine division belt machine adopt middle pilot tunnel descend storied lamination construct method , transect construction ensure security .

九采区胶带输送机皮带机头硐室刷扩，采用中央导硐下行分层的施工方法，大断面施工保证了安全。

The programme of " front benching pilot tunnel divisional and laminated skewed slot construction " was created .

独创了“正台阶导硐分部分层斜沟施工方案”，该方案具有良好的推广应用价值。

Boring Construction Technique of Timbering Piles in Pilot Tunnel of Excavation Subway Station There 's a lot of padding in this novel .

暗挖地铁车站洞内钻孔围护桩施工技术这部小说有大量空洞无物的内容。

The accumulative damage range of surrounding rock is mainly determined by the blasting of excavating face of pilot tunnel I which is parallel to it .

侧壁围岩的累计损伤范围主要由与其齐平的导洞I的开挖掌子面爆破决定；

During the construction , we use the excavation method of first excavating pilot tunnel and the top layer 、 middle layer and the bottom layer parallel fly-over crossing .

在工程施工中采用导洞先行，顶层、中层、底层平行立体交叉的开挖方案。

In some cases , work on the main tunnel progresses a few meters behind the pilot tunnel so that the latter provides ventilation , always a major problem in tunneling operations .

有时，主隧道的掘进紧跟在导洞掘进后面几米，由导洞提供通风。通风一直是隧道掘进中的大问题。

Further , the optimum excavation subsequence is gain through calculating onside wall pilot tunnel plan by finite element method program and do the sensitivity analysis of soil parameter for affects on excavates .

又对侧壁导坑施工方案进行进一步有限元仿真模拟计算，研究得出最优的块体开挖顺序，并作了开挖土体参数对开挖影响的敏感性分析。

Ring excavation reserving core soil method and unilateral pilot tunnel method are compared in the construction of the small interval loess tunnel . A reference for the selection of the small interval loess tunnel excavation is provided .

同时还比对了环形开挖留核心土法开挖与单侧壁导坑法开挖在小净距黄土隧道施工中的优劣，为小净距黄土隧道开挖方式的选取提供参考。

Research result : The grouting problem of level pilot tunnel and main cave of filling karst cave 2 with high-pressure hydrodynamic silt layer is solved by the complete set of system with six kinds of grouting materials .

研究结果：6种注浆材料配套体系较好地解决了随后圆梁山隧道2高压动水粉细砂层充填型溶洞平导与正洞的注浆难题。

It is more outstanding to damage effect of rock mass in repeated frequently blasting operations . For example , accumulative damage of surrounding rock is significant in tunnel with large section excavating with two side-wall pilot tunnel method .

岩体的损伤效应在多次频繁爆破作业的情况下更为突出，如大断面隧洞双侧壁导坑法开挖时围岩发生的累积损伤。

By means of study , it is found that , if protection is necessary for ground building , the suggestion that the pilot tunnel and the soil of the tunnels roof should be excavated first near the buildings which need protection is given .

研究认为：若地面有建筑物需要保护，应先开挖邻近建筑物一侧的导坑，拱部也应先开挖邻近建筑物一侧的土体。

Three-dimensional numerical analysis method was used to study the characteristics of deformation and stress of surrounding rock and supporting structure on the process of tunnel unkennel construction . The comparative analysis of three-steps-seven-footwork tunnelling method and small pilot tunnel method were performed . 3 .

采用三维数值分析手段研究隧道出洞施工过程中的围岩与支护结构变形受力特点，分别对三台阶七步法和超前小导洞法两种出洞施工方案进行对比分析。

Research method : Ordinary concrete-water glass two-shot grouting and extra fine concrete-water glass two-shor grouting are adopted in construction of the pilot tunnel under karst cave 2 . By this way , it is difficult to pass through one cave .

研究方法：在2溶洞下导坑施工中，采用普通水泥-水玻璃双液浆和超细水泥-水玻璃双液浆注浆，十分艰难地通过了溶洞。

The influence of sudden water inflow on drilling + blasting method and corresponding treatment measures in the outlet part of parallel pilot of Qinling tunnel ⅱ are discussed .

总结了Ⅱ线平导出口段的突涌水对钻爆法施工的影响及处理措施。

This paper summarily describes the character of sudden water inflow in the outlet part of parallel pilot of Qinling tunnel ⅱ, and discusses the relation between water inflow and geographical structure and rock feature .

讨论了秦岭隧道Ⅱ线平导出口段的突涌水特征，论述了涌水与地质构造和岩性的联系。

The Pilot Study on Bridge Tunnel Safety Risk Evaluation in Shanxi

桥梁隧道安全风险评估在山西的试点探索