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结合对真空预压的理论认识和工程实践,通过试验对真空预压加固吹填流泥的孔隙水压力、泥面沉降、出水量、含水率、强度参数的变化特征进行分析。试验结果表明:真空预压前期泥面沉降增长迅速,而孔隙水压力增长缓慢;真空预压后期泥面沉降增长缓慢,而孔隙水压力增长较快。分析了真空预压加固吹填流泥强度增长机理,运用有效固结应力法强度增长计算公式结合监、检测数据推算吹填流泥强度增长过程。计算结果表明:理论计算的强度增长规律符合现场实测强度增长规律;真空预压前期土体几乎无强度,真空预压中后期强度增长较快;且抽真空7个月土体强度增长趋势仍未趋于收敛。真空预压加固吹填流泥强度增长的这些特点在真空预压工程设计及施工中应引起重视,应综合考虑强度增长规律及工程经济合理性确定预压时间,并以强度指标作为卸载标准之一。
According to the theoretical understanding and engineering practice of vacuum preloading, the variation characteristics of pore water pressure, mud surface settlement, water discharge, water content and strength parameters under vacuum preloading consolidation are analyzed. The experimental results show that the settlement of mud surface increases rapidly while the pore water pressure increases slowly at the early stage of vacuum preloading, while the settlement of mud surface increases slowly at the later stage of vacuum preloading, while the pore water pressure increases rapidly. The growth mechanism of the strength of the blow-fill mud under vacuum preloading was analyzed. The strength growth process of the blow-fill mud was estimated by using the formula of the strength of the effective consolidation stress method and the monitoring data. The calculation results show that the law of strength growth calculated by theoretical calculation accords with the law of field strength increasing. There is almost no strength in the early stage of vacuum preloading, and the strength increases rapidly in the mid and late stage of vacuum preloading. Tends to convergence. Vacuum preloading should be paid more attention to in the design and construction of vacuum preloading engineering. These characteristics should be taken into consideration in consideration of the law of strength increase and economic rationality of the project, and the strength index should be taken as the unloading standard one.