Monotonic and dilatory pore-pressure decay during piezocone tests in clay
Monotonic and dilatory pore-pressure decay during piezocone tests in clay
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DOI：
10.1139/t98-062
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发表时间：
1998-12
影响因子：
3.6
通讯作者：
S. Burns;P. Mayne
中科院分区：
文献类型：
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作者：
S. Burns;P. Mayne
在细粒土的锥突暂停期间，进行了孔水压力耗散试验来评估固结系数。对于带肩滤元的标准压电体，软粘土和粉土的响应随时间呈单调递减；然而，在重度超固结粉土和粘土中进行的耗散试验显示出延迟行为，孔隙压力行为从初始测量值增加到最大值，然后降低到静水值。本文提出了一个结合空腔膨胀理论和临界状态土力学的理论框架，并给出了径向固结方程的解析解。该方法能够描述在土体中进行的耗散试验的孔压响应曲线，无论是单调减小的还是缓慢减小的孔压行为。关键词：孔洞膨胀，固结，压电锥，孔隙压力。
During a pause in cone penetration in fine-grained soils, pore-water pressure dissipation tests are performed to evaluate the coefficient of consolidation. For standard piezocones with shoulder filter elements, soft clays and silts show a monotonically decreasing response with time; however, dissipation tests performed in heavily overconsolidated silts and clays show dilatory behavior, with the pore-pressure behavior increasing from the initial measured value to a maximum, and then decreasing to hydrostatic values. This paper presents a theoretical framework which combines cavity-expansion theory and critical-state soil mechanics with an analytical solution to the radial consolidation equation. The method is able to describe the pore-pressure response curve for dissipation tests performed in soils which demonstrate either monotonically decreasing or dilatory pore-pressure behavior.Key words: cavity expansion, consolidation, piezocone, pore pressure.