High-ground-stress weak surrounding rock tunnel excavation construction method
A technology for tunnel excavation with weak surrounding rock, applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of complex determination of tunnel reserved deformation, difficulty in achieving ideal results, complex geological conditions of tunnels, etc., and achieve practical High value, good use effect, reasonable design effect
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[0041] Such as figure 1 The excavation construction method of a tunnel with high ground stress and weak surrounding rock is shown. Along the longitudinal extension direction of the tunnel, the tunnel with weak surrounding rock is excavated in multiple sections from the back to the front; The excavation construction methods are the same; when excavating any section of the tunnel with weak surrounding rock, the following steps are included:
[0042] Step 1. Test of rock mass strength and maximum internal stress of surrounding rock: before excavation of the current construction segment, the rock mass strength Rb of the surrounding rock of the current construction segment and the maximum internal stress σ of the surrounding rock max test separately;
[0043] Step 2. Determination of the extrusion-type large deformation grade of the surrounding rock: According to the rock mass strength Rb and the maximum in-situ stress σ obtained from the test in Step 1 max , to calculate the str...
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