真空联合堆载预压近海软基加固效果分析

张世民; 王秀婷; 崔耀; 谭照芳

真空联合堆载预压近海软基加固效果分析

基金项目:

杭州市科学技术委员会社会发展项目资助（20160533B95）

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出版历程
- 收稿日期: 2017-02-06
- 修回日期: 2017-03-28

An analysis of the effect of vacuum combined with surcharge preloading on offshore soft foundation reinforcement

ZHANGShimin,

摘要

摘要: 根据舟山近海软基处理的监测数据，详细分析了地表沉降、分层沉降、孔隙水压力及土体水平位移等变化规律。分析表明：6 m以下土层预压后单位土体的压缩量较大，与该土体土质和预压前土层未被压缩有关；每级堆载的施加使孔压相应增加，但因真空预压占主导地位加之孔压的转化，使孔压仍呈下降趋势,且产生的联合超静孔压始终小于0, 说明采用真空联合堆载预压加固软基过程中，抽真空形成一定的负超静孔压后，快速堆载不会出现地基失稳现象；一定深度下土体水平位移由收缩变为向外挤出，是因井阻使真空度沿深度衰减较大，产生的真空吸力小于堆载产生的向外的附加应力。真空联合堆载预压的有效影响深度可达塑料排水板以下4 m。
- 真空联合堆载预压 /
- 分层沉降 /
- 土体水平位移 /
- 近海工程
Abstract: Based on the monitoring data of the Zhoushan coastal soft soil foundation treatment, the surface settlement, layered settlement, pore water pressure and horizontal displacement of soil are analyzed in detail. The results show that the compressive capacity of soil mass in the soil below the depth of 6 m is larger after preloading, which is related to the soil quality and uncompress of the soil layer before preloading. Pore pressure increases with the increasing stack load series. Since the vacuum preloading dominates the main position and pore pressure is transformed, the pore pressure has a downward trend, and the resulting joint super static pore pressure is always less than 0, indicating that the vacuum combined surcharge preloading method can reinforce the soft foundation, the vacuum forms a certain negative pressure after the pore pressure, and the fast reactor load will not appear the phenomenon of foundation instability. The horizontal displacement of soil is converted from shrinkage to squeeze out under a certain depth. Reason for the above phenomenon is that the vacuum degree has higher attenuation by well resistance and the vacuum suction is less than the outward additional stress of the stack load produced. The effective depth of the vacuum combined with preloading can reach 4 m below the plastic drainage board.
- vacuum combined surcharge preloading /
- layered settlement /
- soil horizontal displacement /
- offshore engineering

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参考文献(10)

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