摘要
吹填流泥地基采用真空预压浅层加固的主要目的是为深层地基处理提供稳定的工作面,因此其控制指标是浅层加固区地基承载力或不排水抗剪强度,但是目前的沉降速率卸载标准主要服务于控制工后沉降。为合理确定卸载时机,根据软黏土不排水抗剪强度与有效固结应力的关系、剩余沉降与沉降速率的关系,并考虑卸真空对软黏土抗剪强度的影响,推导得到了浅层加固沉降速率卸载标准公式。浅层加固沉降速率卸载标准与地基承载力或软黏土不排水抗剪强度需求、真空预压荷载、加固厚度、竖向排水体间距、固结系数等有关。工程实例表明该方法确定的沉降速率卸载标准与工程实际基本相符。
Since a stable platform for construction of improvement of deep soft strata is the principal aim of shallow improvement of foundation with dredged slurry, the key parameter of shallow improvement is bearing capacity or undrained shear strength. But present unloading criteria are established for controlling settlement after construction. To decide appropriate time for unloading, equation of unloading criterion with settlement rate for shallow improvement is derived based on the relationship between undrained shear strength and effective consolidation stress and the relationship between residual settlement and settlement rate. The influence on the shear strength of unloading of vacuum is taken into account for the equation of unloading criterion with settlement rate for shallow improvement. Unloading criterion with settlement rate for shallow improvement is related to the required undrained shear strength or bearing capacity, loads such as vacuum, thickness of improvement, distance of vertical drains, coefficient of consolidation, etc. The unloading criterion with settlement rate gotten by the proposed method for shallow improvement of slurry stratum is proved consistent with actual situation by two projects
出处
《水运工程》
北大核心
2015年第6期193-196,共4页
Port & Waterway Engineering
关键词
流泥地层
浅层加固
承载力
不排水抗剪强度
沉降速率
卸载标准
slurry stratum
shallow improvement
unloading criterion bearing capacity
undrained shear strength
settlement rate
