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通过工程实例和应力路线分析,说明采用真空联合堆载预压法加固软基时,也需要考虑加荷速率的控制,否则会发生地基失稳的事故。其与堆载预压不同,由于真空联合堆载预压时有真空的作用,起初的堆载量和速率都可以大一些,一般第一级总荷载控制在50~60 kPa以内比较合适。现场孔隙水压力监测是判断地基是否稳定的必要和有效手段,当总的超静孔隙水压力处于正的状态时,只要小于0.67倍堆载荷载,地基就处于稳定状态。
Through the engineering example and the stress route analysis, it is shown that the vacuum loading combined with preloading should be used to control the loading rate. Otherwise, the instability of foundation will occur. It is different from the preloading. Due to the effect of vacuum when vacuum preloading, the initial load and velocity can be larger. Generally, the first-level total load should be controlled within 50 ~ 60 kPa. The on-site monitoring of pore water pressure is necessary and effective to judge whether the foundation is stable or not. When the total excess pore water pressure is in a positive state, the foundation is in a steady state as long as the load is less than 0.67 times.