水泥搅拌桩联合堆载固结法对海相软土不同处理方式的试验研究

借助中山市某变电站的软基处理工程,结合水泥搅拌桩和堆载固结法,在现场试验进行“先堆载后成桩(DZ)”及“先成桩后堆载(ZD)”两种工艺的处理效果对比。试验过程中通过地表沉降、孔隙水压力、侧向位移、桩的承载力等监测及检测手段,探究了两种工艺条件下的工程特性,分析了各自优异性及其适用的工况条件。结果表明：“先堆载后成桩”工艺对软土的固结度更高,但对堆载边界及外侧环境的影响相对较大,且沉降达到稳定所需时间较长;两种工艺的桩体承载力相差较小,在满足承载力设计要求的前提下,可采取“先成桩后堆载”工艺,该工艺更有利于保护周边建筑环境,且施工工期短,节约成本,具有一定的应用价值。

Experimental Study on Different Treatment Methods of Marine Soft Soil by Cement Mixing Pile Combined with Stack Consolidation Method

In the soft foundation treatment project of a transformer substation in Zhongshan City, the cement mixing pile method and the stack consolidation method were adopted. Through field tests, the treatment effects of the two processes of "first stack and then pile (DZ)" and "first pile and then stack (ZD)" were compared. During the test, through the monitoring and detection methods such as surface settlement, pore water pressure, lateral displacement, and bearing capacity of the pile, the engineering characteristics of the two process conditions were explored, and their respective advantages and applicable working conditions were analyzed. The results show that the "first stack and then pile" process has a higher degree of consolidation for soft soil, but has a relatively large impact on the boundary and the external environment of the stack, and the time required for settlement to stabilize is longer. Due to the small difference in the bearing capacity of the two processes, under the premise of meeting the design requirements of the bearing capacity, "first pile and then stack" process can be adopted. This process is more conducive to protecting the surrounding building environment, and has a short construction period and cost savings, which has certain application value.