Strength and Deformation Behavior of Soft Bangkok Clay
Strength and Deformation Behavior of Soft Bangkok Clay
复制标题
软曼谷粘土的强度和变形行为
DOI：
10.1520/gtj11260j
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发表时间：
2003
影响因子：
1.6
通讯作者：
K. Lai
中科院分区：
文献类型：
--
作者：
T. Seah;K. Lai
利用再压缩和 SHANSEP 技术，对不排水三轴压缩和拉伸模式下固结和剪切过程中应力历史和应力状态的影响进行了实验研究。在SHANSEP试验中，在Ko固结条件下，将样品固结至预固结压力约1.5至2倍的垂直固结应力，然后在进行不排水剪切之前膨胀至所需的超固结比。而再压缩技术中，样品在不排水剪切前直接固结至原位有效应力，再固结后的体积应变小于2%，表明取样质量相对合理。从不排水剪切结果来看，再压缩试验给出的不排水抗剪强度比 SHANSEP 试验估计的高约 28%，这表明由于固结过程中较大的垂直变形，在 SHANSEP 试验中可能发生了一些土体结构的破坏。因此，由 SHANSEP 试验获得的不排水剪切强度和不排水模量要低得多。
The influence of stress history and stress state during consolidation and shearing were studied experimentally under undrained triaxial compression and extension modes, by using the Recompression and SHANSEP techniques. In the SHANSEP tests, the samples were consolidated to a vertical consolidation stress of about 1.5 to 2 times of the preconsolidation pressure under Ko consolidation condition, followed by swelling to required overconsolidation ratio before subjecting to undrained shear. Whereas in the Recompression technique, the samples were directly consolidation to in situ effective stress before undrained shearing, the volumetric strains of the reconsolidation were less than 2%, indicating relatively reasonable sampling quality. From the undrained shear results, the Recompression tests give higher undrained shear strength than estimated from SHANSEP tests by about 28%, indicating that some destructuring of soil structure may have occurred in the SHANSEP tests due to large vertical deformation during consolidation. Consequently, the undrained shear strength and the undrained modulus obtained from the SHANSEP tests were much lower.