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Study on Progressive Faulure of Satulated Dense Sand

饱和密砂连续性破坏研究

基本信息

批准号：
09450181
负责人：
MTSUO Minoru
金额：
$ 6.27万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450181/
关键词：
Dense Sand Excess Pore Pressure Liquifaction Reinforced Soil Seepage Failure Progressive Failure Time Effect

项目摘要

In order to investigate the progressive failure of dense sand deposits, a series of seepage failure tests were carried. The experimental setup was made of inhomogeneous sand deposits with different initial conditions either side of the sheet pile. The findings of this study are summarized as follows. a) Constant loading rate tests show the effect of loading rate on failure and the difference in failure modes. The "high" loading rate that should give partially drained condition shows "high" critical head and large failure region, while "low" loading rate that gives drained condition shows "low" critical head and small failure region. b) When the water table was kept constant at the critical head under drained condition after a "high" loading rate, delayed failure occurred. Some sand deposits failed about two minutes after the loading stopped. Excess pore water pressure around the sheet pile rose with upheaval of sand. c) When the water table was kept constant below the critical head under drained condition after instant loading and unloading, it shows the effect of loading history of seepage force application on deformation and progressive failure. The excess pore water pressure around the sheet pile rose with upheaval of sand.

为了研究密实砂层的渐进破坏，进行了一系列渗透破坏试验。实验装置由板桩两侧具有不同初始条件的不均匀砂沉积物组成。这项研究的结果总结如下。a）恒定加载速率试验表明加载速率对破坏的影响以及破坏模式的差异。当加载速率"高"时，应产生部分排水条件，此时临界水头"高"，破坏范围大;当加载速率"低"时，应产生排水条件，此时临界水头"低"，破坏范围小。B）当地下水位在高加载速率后保持恒定在排水条件下的临界水头时，发生延迟破坏。一些砂沉积物在装载停止后约两分钟失效。板桩周围的超静孔隙水压力随着砂土的隆起而增大。（3）瞬时加卸载后，在排水条件下，当地下水位保持在临界水头以下时，渗透力作用的加载历史对变形和渐进破坏的影响。板桩周围的超静孔隙水压力随着砂土的隆起而增大。