Element tests on hydraulic-mechanical behavior of saturated/unsaturated landslide dam materials
Element tests on hydraulic-mechanical behavior of saturated/unsaturated landslide dam materials
复制标题
饱和/非饱和滑坡坝材料水力力学特性的单元试验
DOI：
10.3208/jgssp.v08.j30
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发表时间：
2020-03
期刊：
影响因子：
--
通讯作者：
Zhang Feng
中科院分区：
文献类型：
--
作者：
Ma Junnan;Xiong Xi;Yang Jiangtao;Mikami Ryota;Shi Zhenming;Zhang Feng
滑坡坝的稳定性是世界各国普遍关注的问题。滑坡坝是一种天然坝，其岩土材料通常处于非饱和状态，这就需要一个饱和/非饱和本构模型来描述滑坡坝材料的水力力学行为。研究（Xiong等人，2018）已经在模型试验和数值模拟中对渗透荷载下的破坏机理进行了研究，而LDM的单元行为仍然不清楚。本文对4种LDM进行了大型不排水饱和三轴压缩试验、保水试验和不排水/不通气非饱和三轴压缩试验。饱和大型三轴试验结果表明，采用间隙级配混合料的临界剪应力比最大，表明该材料制成的滑坡坝最稳定。通过保水试验，得到了LDM的保水曲线。不同的晶粒尺寸分布，WRC的滞后特性也不同。四种不同LDM下的非饱和三轴试验结果表明，随着吸力和平均净应力的增加，材料的强度增加，体积应变的变化趋势相同。
Stability of landslide dam is of great concern worldwide. Geomaterials of a landslide dam, a natural dam, are usually at unsaturated state, which requires a saturated/unsaturated constitutive model to describe the hydro-mechanical behavior of the landslide dam materials (LDM). Study (Xiong et al., 2018) has been done on the failure mechanism under seepage loadings both in model tests and numerical simulations, while the element behavior of LDM is still unclear. In this paper, large-scale saturated triaxial compression tests under undrained condition, water retention test and unsaturated triaxial compression test under undrained/unvented condition were conducted on four kinds of LDM. Results of saturated large-scale triaxial tests show the shear stress ratio at critical state with a gap-graded mixture is the largest, which indicates the landslide dam made of this material is the most stable. Water retention curve (WRC) of LDM is obtained in water retention tests. Hysteresis of WRC varies with different grain size distributions. Unsaturated triaxial test results in four different LDM show that the strength of the materials increases with the increase of suction and mean net stress, and the same tendency in the change of the volumetric strain can be observed.
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