某厂区红层软岩碎石土填方高能级强夯现场试验研究

Field experimental study on high-energy dynamic compaction of red bed soft rock gravel soil fill ground

某大型厂房场地的建设为大型挖填方工程,场地地层岩性以红层软岩为主,填方厚度0~60m不等。为分析不同高能级的强夯处理对红层软岩碎石土地基的加固效果,现采用15000kN·m、12000kN·m、8000kN·m三个强夯能级对碎石土填方地基进行现场试验,强夯处理后,分别进行了平板载荷试验、动力触探试验、地震波检测、多道瞬态面波测试等试验,分析强夯加固前后地基土物理力学性质的变化规律,评价高能级强夯处理该地区碎石土高填方的效果。结果表明15000kN·m和8000kN·m能级强夯对于填土加固效果较好,12000kN·m能级强夯对于填土加固效果较差,原因是12000kN·m能级的试夯区域细粒土含量较多且含水率较高,并对红层软岩对强夯效果的影响因素进行了分析,可为类似填方场地地基处理提供借鉴。

The construction site of a large workshop is formed by excavation and flling.The site mainly consists of red bed soft rock,and the filling thickness varies from O to 6Om.In order to analyze the reinforcement effect of compaction with different dynamic compaction energy on red bed soft rock,three dynamic compaction tests with energy of 15000kN·m,12000kN·m and 8000kN·m were carried out on landfill with gravelly soil.After dynamic compaction,plate load test,dynamic penetration test,seismic wave detection,multi-channel transient surface wave test and other tests were carried out respectively to analyze the change law of physical and mechanical properties of the soil before and after compaction,and to evaluate the effect of high-energy dynamic compaction on thick gravelly landill.The results show that the effect of 15000kN·m and 8000kN·m dynamic compaction for soil filling reinforcement is better,12000kN·m dynamic is poor.The reason is that the fine grained soil and moisture content in the 12000kN·m compaction area is higher.The factors influencing dynamic compaction effect on red bed soft rock are analyzed,it could be referred for the treatment of similar filling ground.