Based on the gob control project of a highway around Qingzhen North interworking,the stability of the site and foundation of mined-out area was simulated,analyzed and evaluated by use of 3D numerical model.In the goaf area,there are D ramp bridges,A ramp and C ramp sites,their foundation stability can not meet the standard requirements,and the engineering treatments are needed.The design for the treatment is adopted with the grouting method,the maximum grouting depth is about 101.2 m.
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