水文地质工程地质2016，Vol.43Issue(3)：66-72,78,8.DOI:10.16030/j.cnki.issn.1000-3665.2016.03.11
天然和饱水状态下泥岩力学性质及损伤变形能量特征分析
An analysis of the mechanical properties and energy characteristics of damage deformation of mudstone under natural and saturated states
摘要
Abstract
In order to study the mechanical properties of the mudstone in the sliding zone and the formation mechanism of the sliding zone of the Sanxi landslide,uniaxial and triaxial compression tests are carried out under natural and saturated states.Experimental results show that deformation,intensity,failure mode and the confining pressure effect of the mudstone are influenced seriously when saturated.The saturated condition makes the stress strain curves of the mudstone convert from strain softening to "elastic-plastic-creep",the damage modes convert from shear damage to plastic collapse,and the confining pressure sensitivity abate,and the softening coefficient decrease with the increasing confining pressure.From the perspective of energy,it is found that the change in the energy rule of two kinds of states of energy is similar.Under the natural state,the energy stores in the form of the elastic strain energy,but it releases in the form of dissipation.The total absorbed energy U and the releasable strain energy Ue before the peak stress and their increasing rates in axial strain under the saturated conditions are less than the corresponding values of the natural specimen,but the dissipation Ud process is opposite.The peak point strain energy and the residual point strain energy are both in linear relation with the confining pressure.The differences in the strain energy accumulation,transformation process,dissipation and release of the mudstone are caused when saturated.The Ue of the saturated mudstone decreases greatly,but its Ud increases.As a result,its mechanical strength will be damped with the sliding zone out of shape and damaged.关键词
泥岩/能量特征/损伤变形/饱水三轴Key words
mudstone/energy characteristic/damage deformation/saturated triaxial tests分类
地质学引用本文复制引用
谢吉尊,冯文凯,胡云鹏,吴刚,乔莹莹..天然和饱水状态下泥岩力学性质及损伤变形能量特征分析[J].水文地质工程地质,2016,43(3):66-72,78,8.基金项目
国家自然科学基金项目资助(41172278,41572291) （41172278,41572291）
