强夯置换碎石墩在挡墙地基加固处理的应用

Application of dynamic compaction replacement crushed stone pier in reinforcement treatment of retaining wall foundation

某加筋挡墙的淤泥质粉质黏土持力层存在地基承载力不足、土体抗剪强度偏低等问题,不能满足设计要求,因此,需进行地基处理。通过技术经济比较,采用强夯置换碎石墩的方式对该挡土墙地基进行加固处理。采用单墩静载试验对处理后的地基进行检验,结果表明:加固处理后地基承载力得到了明显提高,能够满足设计要求;同时通过岩土工程软件计算得到的安全稳定系数也能满足设计要求。该方法可为类似工程提供有益的借鉴。

The muddy silty clay bearing layer of a reinforced retaining wall has some problems such as insufficient bearing capacity of the foundation and low shear strength of the soil,which can not meet the design requirements,so the foundation treatment is needed. Through the technical and economic comparison, the foundation of the retaining wall is strengthened by dynamic compaction to replace the gravel pier. The static load test of a single pier is used to test the treated foundation,and the results show that the bearing capacity of the foundation is obviously improved after reinforcement,which can meet the design requirements;at the same time,the safety and stability coefficient calculated by geotechnical engineering software can also meet the design requirements. This method also provides a useful reference for similar projects.