In situ triaxial creep test for investigating deformational properties of gravelly sliding zone soil: example of the Huangtupo 1# landslide, China
In situ triaxial creep test for investigating deformational properties of gravelly sliding zone soil: example of the Huangtupo 1# landslide, China
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原位三轴蠕变试验研究砾石滑带土的变形特性：以中国黄土坡1滑坡为例
DOI：
10.1007/s10346-018-1062-5
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发表时间：
2018-12-01
期刊：
影响因子：
6.7
通讯作者：
Zou, Zongxing
中科院分区：
文献类型：
--
作者：
Tan, Qinwen;Tang, Huiming;Zou, Zongxing
近年来，发生了许多山体滑坡灾害，造成了相当大的经济损失和其他损失。滑带土的变形和力学性质对滑坡的研究具有重要意义，因为滑带土基本上控制着滑坡的发生和活动。对长江三峡黄土坡1#滑坡滑带土样进行了原位三轴试验。试验结果表明：（1）由于含岩量较高，滑动带压缩性较低（B）仅发生衰减蠕变，不发生突变破坏，并推导了一个包含线性和非线性粘塑性项的本构方程，能较好地拟合试验数据;（c）具有35 A度取向的表面在位移方面呈现各向异性特征，这可能是由于样品立方体内以相似取向形成的裂缝;以及（d）滑坡的蠕变行为可能与滑动带土壤的性质密切相关。当对试样施加与原应力环境相似的应力时，滑带土的特性与滑坡的变形特性相匹配。试验结果表明，从试样的变形特征和结构特征来看，黄土坡1#滑坡将继续蠕变。然而，试验不可避免的局限性和极端的外部因素，即意外的降雨和水位波动，不能忽视。
In recent years, numerous landslide catastrophes have occurred, generating considerable financial losses and other tolls. The deformational and mechanical properties of sliding zone soil would be in primary significance to landslide research, as the sliding zone basically controls the initiation and mobility of the landslide. An in situ triaxial test was carried out on a sample from the sliding zone of the Huangtupo 1# landslide, a subdivision of the Huangtupo landslide in the Three Gorges area of China. The test results indicate that (a) the sliding zone exhibits low compressibility due to the high rock content (54.3%) and long-time consolidation by the overlying soil mass; (b) only decaying creep occurs without abrupt failure, and a constitutive equation with both linear and nonlinear viscoplastic terms is deduced to accurately fit the test data; (c) the surface with an orientation of 35A degrees presents anisotropic traits in terms of displacement, possibly due to cracks that formed at similar orientations within the sample cube; and (d) the creep behavior of the landslide may be closely related to the properties of the sliding zone soil. When a similar stress magnitude to that of the in situ stress environment is applied to the sample, the sliding zone soil behavior matches the landslide deformative behavior. The test results indicate that the Huangtupo 1# landslide will continue to creep, as interpreted from the deformation traits and structural properties of the sample. However, unavoidable limitations of the test and extreme external factors, namely unexpected rainfall and water fluctuation, cannot be ignored.