湿陷性黄土地基综合处理新技术的现场试验与效果分析

In-situ experiment of comprehensive treatment technology of collapsible loess foundations and its eftect analysis

针对湿陷性黄土地区的铁路、公路路基及堤基浸水湿陷的工程问题,在业已提出的处理方法(IDITI),即浅层阻水、浅层排水、浅层防水、封闭截水、深层导水的基础上,首先进行了湿陷性黄土地基处理的现场浸水试验。试验表明,浸水后探井不同深度采取土样的含水量变化小,IDITI法具有明显的阻水、排水效果。其次,用数值分析方法模拟了连续多日强降雨情况下经处理后地基的渗流场,围封处理范围内地基土体的含水量增长较小。验证了IDITI法抑制湿度增长,利用天然土承载能力,处理湿陷性黄土地基的可行性。

For the problem of wetting collapsible loess foundation in railway and highway and dam engineering,the in situ experiment of collapsible loess foundation,dealt with a new comprehensive treatment technology named IDITI method which includes impedance,drainage,interdiction,truncation and infiltration,was carried out under wetting and loading.The results show the settlement of loess foundation dealt with IDITI method is small under wetting and loading and the water content keep invariable after surface founder.The IDITI method is with the anti-seepage and draining double effects.The foundering loess foundation dealt with IDITI method was simulated by numerical method,so as to repeal the water content distribution of stratum.The calculating result also shows the increase of water content is small in treatment foundation.So the IDITI method is feasible.