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大面积采空区引起的地面沉降或沉陷严重影响地表土地的正常使用。某循环经济产业集聚区位于采空区上方,开挖基坑时发现2条宽度约4 cm的地裂缝,经过反复论证,对该区域的采空区进行了水泥粉煤灰注浆处理,注浆前后的沉降观测结果表明:注浆对地表沉降速率有明显的控制作用,平均沉降速率由注浆前的0.052 mm/d下降至注浆后的0.0059 mm/d,使地基稳定性达到了国家相关规范的要求。
Large subsidence area caused by land subsidence or subsidence seriously affect the normal use of surface land. A circular economy industrial agglomeration area is located above the goaf. When excavating the foundation pit, two ground fissures with a width of about 4 cm were found. After repeated demonstration, cement fly ash grouting treatment was conducted on the goaf in the area. Note The results of settlement observation before and after the slurry show that the grouting has significant control on the settlement rate of the ground and the average sedimentation rate decreases from 0.052 mm / d before grouting to 0.0059 mm / d after grouting, which makes the foundation stability reach the national Relevant specifications of the requirements.