[科研项目] 含软弱夹层顺层滑坡演化机理及稳定性评价研究
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时间：2015-12-01
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项目来源：国家自然科学基金（青年项目）
项目名称：含软弱夹层顺层滑坡演化机理及稳定性评价研究
主要负责人：邹宗兴
项目时间：2016/01-2018/12
项目经费：22万元
项目简介：
顺层滑坡通常沿着软弱夹层发生滑动，往往因其规模巨大，致灾后果严重而备受关注，亟需开展含软弱夹层顺层滑坡演化机理研究。受地表水流主导作用，软弱夹层劣化区不断扩展，其物理力学性质表现出明显的时效性与空间变异性特点。研究软弱夹层劣化时空规律，建立软弱夹层劣化模式；开展不同饱水时间条件下的软弱夹层剪切应变软化与剪切流变试验，研究软弱夹层饱水劣化剪切特性，建立软弱夹层剪切力学本构演化方程；基于软弱夹层劣化模式与剪切本构演化方程，建立典型含软弱夹层顺层滑坡演化地质力学模型与数值计算模型，结合现场监测，分析其应力、变形时空变化规律，揭示含软弱夹层顺层滑坡演化机理；构建一套集基于演化阶段判识的定性评价、基于失稳临界长度确定的半定量评价及考虑软弱夹层劣化特性稳定性计算的定量评价方法于一体的含软弱夹层顺层滑坡稳定性评价体系。为我国西部地区工程建设中的顺层斜坡安全性评价与治理提供重要的理论依据与技术支持。
Consequent bedding landslides usually occur along weak interlayer, and have been drawn lots of attention due to catastrophic consequence related to their enormous volumes. Therefore, it is emergent to carry out the study on the evolution mechanism of this type of landslide. Dominated by the surface water, the degradation area of weak interlayer expands gradually, and the physical-mechanical properties show obvious characteristics of the timeliness and the spatial variability. The degradation model of the weak interlayer will be established based on the research of its spatio-temporal rule of degradation. The shearing strain-softening test and shear rheological test on weak interlayer will be carried out under different saturation time conditions, to study the shear characteristics of saturated weak interlayer, then to construct an evolution equation of the shearing mechanics constitutive. Based on the degradation model and the evolution equation of the shearing mechanics constitutive, the geological-mechanical evolution model and the numerical model of typical consequent bedding landslides within weak interlayer will be built. The spatio-temporal evolution rule of the stress and deformation will be studied to reveal the evolution mechanism of the landslide with weak interlayer, by numerical simulation and on-site monitoring. A stability evaluation system will be established, combining the qualitative assessment method based on evolutionary stage, semi-quantitative assessment method based on the determination of critical length of the slide block and quantitative evaluation of the stability by the equilibrium calculation considering the deformation coordination. This study can provide significant scientific theory basis and technical support for the assessment of the stability of the landslide and the management of the landslide in the western China during the construction.
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