导洞 meaning in English
heading, pilot
pilot drift
pilot hole
pilot tunnel
pilotdrift
Examples
- Exploring on construction technique of continuous - arched tunnel without using central heading method
连拱隧道无中导洞施工技术探讨 - The discussion on the technology of t - cave for twin - arch tunnel and middle separated wall
连拱隧道三导洞施工技术、中隔墙施工技术探讨； 5 - Numerical analysis and treatment of a collapsed middle drift for shallow multi - arch tunnel under unsymmetrical pressure
浅埋偏压连拱隧道中导洞坍方数值分析与处治 - Based on the numerical simulation , it can be concluded that the three heading construction method with the tunnel close to the mountain tunneled first should be chosen in the construction of the multi - arch loess tunnel
计算结果表明对于偏压黄土连拱随道应采用先开挖靠山一侧的侧壁导洞法进行施工。 - On the basis of model test , a better construction method under pre - prop for the surrounding rock i , ii , iii , named whole section excavation with heading in moderate degree and that with center heading and center partition first , then with two sides heading , is put forward
在模型试验的基础上，提出了、 、类围岩隧道在预支护下的优化施工方法，即下导洞适度超前全断面开挖与先行中导洞及中隔墙、其次两侧下导洞适度超前全断面开挖。