Effects of Membrane Compliance on Pore Water Pressure Generation in Gravelly Sands under Cyclic Loading
Effects of Membrane Compliance on Pore Water Pressure Generation in Gravelly Sands under Cyclic Loading
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循环荷载下膜柔顺性对碎石砂孔隙水压力产生的影响
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Shakeri
中科院分区：
文献类型：
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作者：
S. Haeri;M. Shakeri
本文对位于伊朗阿尔博尔兹山大陆一侧的特大城市德黑兰的天然粗砂和砾石存款的不排水循环特性进行了试验研究。本文研究了在粗粒土不排水循环三轴试验中对孔压重分布和液化起重要抑制作用的膜柔度。目前还没有或很少有令人满意的方法来解释这种现象的砾石土，因此，不容易确定的粒状土的非顺应性循环荷载阻力和评价这种材料在自然和原位状态下的行为。本文提出了一种考虑膜柔度对循环荷载作用下孔压测量结果影响的方法。还介绍了一种方法来验证所提出的程序，采用轻水泥试样。此外，一些新的超孔隙水压力比对失败的循环次数的相关性已经提出了各种有效的限制和偏循环应力施加在重组和各向同性固结标本的非顺应性系统。在考虑或不考虑膜顺应性的测试过程中观察到初始液化;然而，顺应性情况下初始液化的循环次数较高。
The paper deals with an experimental study of the undrained cyclic behavior of a natural coarse sand and gravel deposit located in Tehran, a megacity situated on the continental side of the Alborz Mountain in Iran. Membrane compliance that plays a significant role in inhibiting redistribution of pore pressure and liquefaction in undrained cyclic triaxial tests performed on coarse granular soils is studied in this paper. Currently there is no or little satisfactory method for accounting for this phenomenon for gravelly soils, and thus the non-compliant cyclic loading resistance of granular soils and the evaluation of the behavior of such material in natural and in situ state are not easily determined. A procedure has been proposed in this paper for consideration of membrane compliance effects on the pore pressure measurements during cyclic loading. A method is also introduced to verify the proposed procedure by employing lightly cemented specimens. In addition, some new correlations for excess pore water pressure ratio against the number of cycles to failure have been presented for a non-compliant system under various effective confining and deviatoric cyclic stresses applied on reconstituted and isotropically consolidated specimens. Initial liquefaction has been observed during the tests with or without consideration of membrane compliance; however, the number of cycles to initial liquefaction is higher for the compliant case.