真空预压加固地基固结简化计算方法

将均质软黏土地基有限元方法与常规计算方法进行对比分析,研究真空预压与堆载预压之间计算荷载值及加载速率的等效关系.研究表明,等量瞬时荷载下,堆载引起的地基沉降要比抽真空所引起的地基竖向沉降大,等效线性加载条件下,较为符合抽真空条件下的地基固结沉降过程,由此提出了一种真空预压地基固结计算的简化方法.应用简化计算方法对某真空预压处理软基试验工程进行固结沉降计算,结果表明,简化计算方法计算结果与实测结果基本吻合.

Simplified calculation method for consolidation of soft ground improved by vacuum preloading

A comparative study of the finite element method and the conventional calculation method for consolidation of homogeneous soft clay was carried out to analyze the equivalent load and loading rate between vacuum and surcharge preloading.The calculated results show that,under the same instantaneous loading condition,the settlement of foundation in vertical direction induced by surcharge is greater than that induced by vacuum pressure,and that with the equivalent linear loading rate,the consolidation settlement process accords well with the reality under vacuum pressure.Thus,a simplified calculation method for consolidation of soft ground by vacuum preloading was proposed.The present was applied to consolidation settlement calculation for a soft ground improved by vacuum preloading,and the calculated results are in good agreement with the measured data.