排水板真空堆载预压法在大厚度软基处理中的应用

Drainage board vacuum preloading preloading method applied in the large thickness of the soft foundation treatment

真空-堆载预压法在处理大厚度淤泥质软基上的公路差异沉降和稳定性问题中应用广泛,本文从加固机理出发,根据工程现场的监测数据对预压期间各土层的沉降、侧向位移、孔隙水压力进行了分析,认为前期真空预压时沉降主要发生在淤泥层,堆载加压后填土层沉降较大;堆载作用下淤泥层发生蠕变现象,判断其与竖向荷载大小、层间土弹性模量比及软弱层的厚度有关。另外,由于水压消散值的测定受真空和堆载联合作用而随时间变化较复杂,推荐用沉降量推算固结度。

Vacuum - preloading method Highway large thickness differences in the treatment of soft soil foundation settlement and stability problems in a wide range of applications, the paper starting from the reinforcement mechanism, based on monitoring data for each project .site soil subsidence during the pre-pressure, lateral displacement, pore water pressure were analyzed that when the early settlement of vacuum preloading occurs mainly in the silt layer, after preloading pressure to fill the larger soil subsidence; silt layer stack loads occur creep phenomenon and determine its vertical load size, layer thickness and elastic modulus ratio related to the weak soil layer.In addition, due to the determination of the value of vacuum and pressure dissipation Heaping by the combined effects of more complex and varies with time, it is recommended to use the projected degree of consolidation settlement.