采空区加固处治措施研究

The Study on the Reinforcement Treatment Measures in Mined-out Area

针对高速公路下伏采空区对路基造成的不良影响,分析了填充、回填、强夯、注浆、跨桥等采空区处理方法及其适用条件,提出处理方案选取程序,并以山西某公路采用注浆法加固为例,对注浆材料的配比进行优化设计,计算采空区加固范围、注浆量,最后采用高密度电阻率勘探法对注浆效果进行评价。结果表明:注浆加固法改善岩体的强度最高幅度达4.24 GPa,电阻率最大降幅达3 346.8 OHM·M,有效改善了岩层的整体性能和强度性能。

For the adverse effects of highway underlying mined-out area on subgrade, this paper analyzedthe treatment methods of filling, backfilling, compaction, grouting, cross-bridge and its application conditions inmined-out area, and it put forward the treatment scheme selection procedures. Combined with the groutingreinforcement of a highway in Shanxi, it optimized and designed the grouting material ratio. It also calculated thereinforcement scope and grouting quantity in mined-out area, finally it evaluated the grouting effect with the highdensity resistivity prospecting method.