Non-excavation ecological construction method for tunnel
A construction method and non-excavation technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve environmental problems and serious safety problems, and achieve the effects of preventing rolling stones and falling objects, reducing damage, and high efficiency
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[0033] In traditional water conservancy and hydropower engineering construction, mining, road and bridge tunnels and other projects, the part where the tunnel connects with the mountain is often excavated on side slopes and upside slopes, and reinforced with anti-slide piles and prestressed anchor cables.
[0034] According to the "Code for Design of Highway Tunnels JTG D70-2004", the buried depth boundary of the cavern is judged according to the equivalent height of the load, and the formula is:
[0035] h p =(2~2.5)h q
[0036] Where: H p — Depth of boundary of shallow buried tunnel (m);
[0037] h q ——load equivalent height (m), calculated according to the following formula:
[0038]
[0039] q——vertical uniform pressure (kN / m 2 );
[0040] γ - weight of surrounding rock (kN / m 3 ).
[0041] H is taken from grade IV~VI surrounding rock p =2.5h q
[0042] H is taken as the surrounding rock of grade I~III p = 2h q
[0043] Assuming that the quality grade of t...
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