DEFORMATION BEHAVIOR OF SANDY SLOPES DURING RAINWATER INFILTRATION
DEFORMATION BEHAVIOR OF SANDY SLOPES DURING RAINWATER INFILTRATION
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DOI：
10.3208/sandf.44.2_15
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发表时间：
2004-04
影响因子：
3.7
通讯作者：
Rolando P Orense;K. Farooq;I. Towhata
中科院分区：
文献类型：
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作者：
Rolando P Orense;K. Farooq;I. Towhata
降雨引起的边坡破坏通常发生在大雨期间或大雨过后的短时间内。为了分析导致此类破坏的机制和条件，对从先前灾难性山体滑坡现场获得的三组沙质样品进行了模拟场应力路径的恒定剪应力排水三轴试验。研究了各种参数（例如初始相对密度和主应力比）对变形时间发展的影响。失效开始后的行为受到变形模式（即压缩或膨胀）的显着影响。由于与剪切过程相关的孔隙水压力增加，压缩性土体迅速破坏，而膨胀性土体由于膨胀过程中孔隙水压力的损失而表现出缓慢破坏，增加了土体的抗剪力。此外，还进行了常规的三轴排水和不排水试验，以说明不同应力路径下土壤响应的差异。结果表明，在分析雨水渗透下边坡的稳定性时，使用恒定剪应力排水试验中与破坏萌生相关的强度参数可能比传统三轴试验中获得的参数更合适。
Rainfall-induced slope failures often occur within a short period of time during or immediately after heavy rainfall. To analyze the mechanism and conditions leading to such failures, constant shear stress drained triaxial tests, which mimic the field stress path, were conducted on three sets of sandy samples obtained from sites of previous disastrous landslides. The effects of various parameters, such as initial relative density and principal stress ratio, on the temporal development of deformation were examined. Behavior after initiation of failure was significantly affected by the mode of deformation, i.e., whether compressive or dilative. Compressive soil failed rapidly due to increased pore-water pressure associated with the shearing process, while dilative soil exhibited slow failure due to loss in pore-water pressure during dilation that increased the shearing resistance of soil. Moreover, conventional triaxial drained and undrained tests were also performed to illustrate the difference in soil response under different stress paths. The results demonstrated that in analyzing the stability of slopes under rainwater infiltration, the use of strength parameters associated with failure initiation in constant shear stress drained tests may be more appropriate than those obtained from conventional triaxial tests.