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隧道洞口原则,确定洞口的因素

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正确答案:

原则:

1. 洞口不宜设置在隘口、沟谷的中心或沟底低洼处;

2. 洞口应避开不良地质地段;

3. 当隧道线路通过岩壁陡立基岩裸露处时,最好不刷动或少刷动原声地表,以保持山体的天然平衡;

4. 减少洞口路堑段长度,延长隧道提前进洞;

5. 洞口线路宜与等高线正交;

6. 线路位于有可能被水淹没的河滩或水库回水影响范围内时, 隧道洞口标高应高出洪水位加波浪高度,以防洪水灌入隧道;

7. 为了确保洞口的稳定安全,边坡及仰坡均不宜开挖过高; . 隧道洞口原则,确定洞口的因素。

8. 当洞口附近遇有水沟或水渠横跨线路时,可设置拉槽开沟的桥梁或涵洞,以排泄水流;

9. 当洞口地势开阔,有利于施工场地布置时,可利用弃渣有计划有目的地改造洞口场地,以便布置运输便道、材料堆放场、生产设施用地及生产生活用房等。因素:工程地质、水文地质、人文景观等综合因素。

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