Sectional grouting construction method for karst tunnel water leakage
A technology of segmented grouting and construction method, used in tunnels, tunnel linings, earthwork drilling and other directions, can solve the problems of poor grouting orifice sealing effect, low grouting efficiency, and inability to improve seepage resistance. The effect of improving the pressure-bearing capacity of orifice sealing, saving construction time and improving the sealing effect
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[0058] The rock of a karst subway tunnel is deeply buried limestone, which is in a relatively complete permeable state, and the surrounding rock grade is grade III or grade IV. The karst subway tunnel has obvious strand-shaped water leakage points in the middle and upper part of the left wing, and the following steps are used to plug the leakage by grouting. The first step: According to the allowable deviation between the position of the grouting hole and the design position is less than 5cm, the deflection angle meets the design requirements, the position deviation of the bottom of the hole is less than 30cm; the diameter of the final hole of the grouting hole is 200mm; the drilling construction sequence is from bottom to top Construction at intervals; the distance between the holes is 1.5m x 1.5m, and the long and short staggered plum blossom-shaped holes are used, and the hole depths are 7m and 5m respectively. The required holes are formed, such as Figure 5 As shown; the ...
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