北京上庄东路巨型砂石坑回填路基复合处理技术

Comprehensive Treatment Technology of Roadbed of Large Sandstone Pit Backfill in Beijing

根据北京上庄东路巨型砂石坑的地质条件及周边情况,采用振冲碎石桩、强夯置换及强夯复合地基处理技术与重锤夯扩挤密碎石桩对砂石坑回填路基进行综合处理。在高水位的情况下,对由软土和建筑垃圾回填形成的砂石坑,采用振冲碎石桩作为砂石坑渗水通道,通过强夯置换形成纵向增强体并加大处理深度,最后采用强夯处理的复合处理方案;对于桥桩两侧的回填土路基则采用重锤夯扩挤密碎石桩方案,减少对桥桩的影响。

According to the geological conditions of the large sandstone pit and the peripheral conditions,the ideal comprehensive application of vibor-replacement stone column,dynamic replacement dynamic composite foundation treatment and heavy compacted crushing stone pile in Shangzhuangdonglu backfill roadbed of sandstone pit was introduced.At high water level,for the sandstone pit back-filled with soft soil and construction waste,vibro-replacement stone column was taken as the seepage tunnel,by dynamic replacement to form vertical reinforcement with the treatment depth increasing,and finally the compound treatment scheme of compact consolidation was adopted.For the backfill roadbed at both sides of bridge pile,the scheme of heavy compacted crushing stone pile was used in order to reduce the impact to bridge pile.