English translation for "pilot tunnel"
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- 超前平硐
导洞（导坑）
道洞
前探平硐
隧道导洞
Related Translations:
- Example Sentences:
| 1. | Construction of flat tunnel of large span at extra - shallow depth must be conducted on the principle that advance grouting should be strictly performed before excavation and length of pull at one time should be short , together with reinforced support , immediate closing and constant monitoring and surveying . that preceding pilot tunnels , large - volume excavation divided into small ones , excavation of flank before that of center , upper before lower , arch before wall etc is a good method which could effectively reduce surface subsidence and its adverse effect on adjacent buildings , in addition , some other measures are also taken to lessen blast - induced vibration in the ground and surrounding structures . in a word , all means and steps mentioned above have already proved effective and practicable in practice
软弱大跨超浅埋扁平隧道必须按“管超前，严注浆，多分部、短开挖、强支护、快封闭，勤量测”的施工原则进行施工，采用“眼镜超前，化大为小，先侧后中，先上后下，先拱后墙”的施工方法控制地表沉降和对周边建筑物的影响；采用“多分部，化大为小，短进尺，密布眼，弱装药，设减振槽” ，控制爆破振动，经过实践证明，这些方法都是行之有效的。 | | 2. | Tensile stress field would appear in the proximity of arched vault after excavation , slacking of surrounding rock and subsequent dropping of blocks of rock from such area would possibly occur at any time in the context of extra - shallow depth . so i - steel arched support must be erected to provide against possible block dropping and be integrated into a ring with that of pilot tunnels on both sides
拱顶在核心土开挖后，在一定范围内出现拉应力区，在超浅埋情况下极容易掉块和发生围岩松驰，因此核心土必须边开挖边架设工字钢拱架，使之与左右导洞拱顶工字钢形成整体。 |
- Similar Words：
- "pilot transition training" English translation, "pilot trench" English translation, "pilot trim rate" English translation, "pilot truss" English translation, "pilot tube" English translation, "pilot tunnel floor" English translation, "pilot tunnel method" English translation, "pilot turn book" English translation, "pilot type bit" English translation, "pilot type plug bit" English translation
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