叶观宝, 金培阳, 张振. 2015: 真空预压联合堆载预压加固软土地基现场试验研究. 工程地质学报, 23(s1): 721-727. DOI: 10.13544/j.cnki.jeg.2015.s1.110
    引用本文: 叶观宝, 金培阳, 张振. 2015: 真空预压联合堆载预压加固软土地基现场试验研究. 工程地质学报, 23(s1): 721-727. DOI: 10.13544/j.cnki.jeg.2015.s1.110
    YE Guanbao, JIN Peiyang, ZHANG Zhen. 2015: FIELD TEST OF SOFT SOIL IMPROVED BY A COMBINED METHOD WITH VACUUM AND SURCHARGE PRELOADING. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 721-727. DOI: 10.13544/j.cnki.jeg.2015.s1.110
    Citation: YE Guanbao, JIN Peiyang, ZHANG Zhen. 2015: FIELD TEST OF SOFT SOIL IMPROVED BY A COMBINED METHOD WITH VACUUM AND SURCHARGE PRELOADING. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 721-727. DOI: 10.13544/j.cnki.jeg.2015.s1.110

    真空预压联合堆载预压加固软土地基现场试验研究

    FIELD TEST OF SOFT SOIL IMPROVED BY A COMBINED METHOD WITH VACUUM AND SURCHARGE PRELOADING

    • 摘要: 真空预压联合堆载预压是加固深厚软黏土地基的有效方法。本文开展了真空预压联合堆载预压的现场试验研究。在试验过程中监测了加固区域膜下真空度、地表沉降和孔隙水压力的时空变化规律。通过对试验数据的分析, 推算了真空预压联合堆载预压作用下地基的最终沉降量。依据平均固结度理论, 分别计算了基于应力形式和应变形式定义的地基平均固结度。结果表明, 不均匀沉降主要发生在堆载阶段。真空度随排水板深度的增加而衰减。基于应力和应变两种形式计算的地基平均固结度分别为90.2%和91.8%, 表明地基土在预压期间已完成了大部分沉降, 取得了理想的加固效果。

       

      Abstract: The combined method with vacuum and surcharge preloading is an effective alternative to improve the thick soft soil. This paper introduced a field test of soft soil improved by the combined method with vacuum and surcharge preloading. The vacuum pressure under membrane, settlement of ground surface and pore water pressure in soil were monitored during the preloading period. The final settlement was predicted based on the field data. The average degrees of consolidation in terms of stress and strain were calculated respectively. The test results indicated that the differential settlement was mainly developed during the surcharge preloading period. The vacuum pressure decreased down the drain length. The computed average degrees of consolidation in terms of stress and strain were 90.2% and 91.8%, respectively, indicating that the most settlement occurred during the preloading period and a satisfactory improvement effect was achieved.

       

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