强夯置换碎石法在深厚杂填土地基处理中的试验研究

Test Study on Deep Miscellaneous Fill Foundation Treatment Based on Dynamic Replacement Gravel Method

为提高地基承载力及变形模量、满足上部建筑使用要求、消除上部填土的湿陷性,以重庆地区某厚填土、高水位地基处理工程为例,采用强夯置换碎石法对其进行了现场试验。结果表明,地下水位埋深浅、深厚杂填土地基经强夯置换处理后,土体发生了较大的沉降变形,密实度、承载力及变形模量均有较大幅度的提高,上部较差的软弱土层形成理想的硬壳层,可满足上部建筑承载力及刚度使用要求,基本消除了填土的湿陷性,同时明显改善了浅部地基的受力性能,局部架空现象也有明显改善。

In order to improve bearing capacity and deformation modulus, meet the architectural requirements of upper part, eliminate the collapsibility of the upper fill, dynamic replacement test has been proposed in this paper. Field test has been studied for dynamic replacement method in high water level and thick fill foundation in Chongqing region. The results show that density, bearing capacity and deformation modulus has a more substantial increase after dynamic replacement; the upper soft soil can be ideal crust layer; the collapsibility of the upper fill is eliminated basically; mechani cal property of shallow foundation and local overhead phenomena are obviously improved.