砂砾桩处理公路软土地基性状现场试验研究

Experimental Study on The Behavior of Soft Soil Foundation of Highway By Sand-gravel Pile Process

由于软土地基所具有的承载能力偏低等特性,对公路的正常安全使用有较大影响,一般在软土地基上进行工程建设时需要对软土地基进行加固处理.在碎石桩处理软土地基原理的基础上,结合实际工程场地工程地质、水文地质特点和施工条件,因地制宜地提出了采用砂砾桩对依托工程地基进行处理,并通过载荷试验、动力触探试验等原位试验对砂砾桩处理依托工程场地效果进行了检验,现场试验结果表明:砂砾桩处理该场地软土地基效果明显,可以达到提高地基承载能力、减小地基变形的目的.研究成果为类似条件下软弱地基土处理提供了一定的工程试验经验.

Soft soil foundation＇s characteristics,such as low bearing capacity,have great influence on the normal safe use of the highway.As a result,the general construction on soft soil foundation requires reinforcement of soft soil foundation.Based on the principle of gravel pile treatment of soft soil foundation,and combined with the site engineering geological and hydro geological characteristics and construction conditions of the actual project,the method to treat the engineering foundation by using the sand-gravel pile is put forward to suit the local conditions.In addition,the efficiency of the treatment is checked by some in-situ tests such as the loading test,dynamic penetration test,etc.Site tests＇ results show that the treatment efficiency of the soft soil foundation by the sand-gravel pile is obvious,and it can achieve the purpose of increasing foundation bearing capacity and reducing the foundation deformation.The results provide certain engineering test experience to the soft soil foundation treatment of similar conditions.