塑料排水板与碎石桩处理软土地基作用效果对比分析

Comparative Analysis of Effects of Prefabricated Vertical Drain and Gravel Pile on Soft Soil Foundation Treatment

结合四川盆地北部地区特殊地质条件和软土物理力学性质,针对新建巴中～南部高速公路实际工程中不同的软基类型,运用地基沉降、深层水平位移及路堤工后沉降等监测手段对塑料排水板和碎石桩两种软土地基处理方法的效果进行对比分析,确定两种软基处理方法对地基沉降和水平位移的影响规律。监测结果表明,塑料排水板处理软土地基,软土排水能力强,软土固结较快;碎石桩处理软土地基能有效控制地基深层水平位移值的进一步扩大。结合研究成果,提出了针对软土地基层厚度和路基填筑高度合理选择软基处理措施的办法,为软基处理设计与施工提供技术参考。

According to the special geological conditions and the mollisol＇s physico-mechanical proper-ties in the northern part of Sichuan Basin, aimed at the different types of soft soil foundation on the newly paved expressway from Bazhong to Nanbu , the monitoring methods including the foundation settlement, the deep horizontal displacement and the sub-grade post-construction settlement are applied to compare the effects of prefabricated vertical drain and gravel pile on soft soil treatment, and the influence of the two kinds of soft soil treatment methods on foundation settlement and horizontal displacement is ascertained. The monitoring results show that when the prefabricated vertical drain is used to dispose the soft soil foun-dation, the soft soil has such strong drainability that it can be rapidly consolidated. And the gravel pile used to dispose the soft soil foundation can effectively control the expansion of the foundation＇s deep hori- zontal displacement. Integrated with the research achievements, the method to reasonably choose the treatment measures for soft soil foundation aiming at the thickness of soft soil foundation layer and the sub-grade filling height, is put forward, which provides a technical reference for the design and construc-tion of soft soil foundation treatment.