工程荷载作用下缓倾角反倾似层状岩质边坡变形稳定性分析

在反倾层状边坡的破坏机制和稳定性分析方面，由于其稳定性一般较好，系统深入地研究其破坏机制和稳定性的反而不多。以火山岩地层多次火山喷发旋回形成的缓倾角反倾似层状岩质边坡为研究对象，利用有限元分析其位移矢量图，揭示边坡的变形破坏机制和稳定性控制要素，利用极限平衡法、矢量和法，评价其稳定性，利用强度折减法分析塑性区的扩展规律，揭示滑动面发展的时间空间规律，结果表明，（1）类似层状反倾岩质边坡的潜在破坏模式为剪切–张拉破坏，滑面形态表现为近似折线状：顺坡向穿过凝灰岩夹层和强风化岩体，后缘通过陡倾结构面；（2）极限平衡法、矢量和法的边坡稳定性综合评价表明边坡浅层稳定性不满足工程稳定性要求，深层稳定性满足工程稳定性要求，且三维矢量和安全系数大于二维结果，是三维效应造成；（3）塑性区扩展揭示滑面的空间发展序列为滑面4、5、3。文中的技术路线和分析方案可用于缓倾角反倾层状岩质边坡稳定性评价。

Deformation stability analysis of gentle reverse inclined layer-like rock slope under engineering load

In the case of reverse inclined layer-like slope failure mechanism and stability analysis, due to the general good stability of the system, the intensive study is not very much in terms of its failure mechanism and stability. A gentle reverse inclined layer-like rock slope formed by several volcanic eruption cycles is introduced, and the tilt of layered rock slope as the research object, based on the finite element analysis of the displacement vector diagram, reveals the slope deformation failure mechanism and stability of the control elements; The stability is evaluated by using limit equilibrium method and vector sum analysis method. Using strength subtraction analysis regularity of plastic zone, it reveals time space law of the development of the slip surface. The results show that: (1) The similar layered rock slope is the tilting of the potential failure mode is shear-tension, sliding surface morphology of approximate folded line, slope through the tuff interlayer and strongly weathered rock mass, the trailing edge passes through the steeply dipping structural surface. (2) The limit equilibrium method and vector sum analysis method of comprehensive evaluation show that the stability of shallow slope stability does not meet the requirements of the engineering stability; stability of deep satisfies the stability requirement; and the safety factor of 3 D vector sum is greater than 2 D; this is caused by 3 D effect. (3) The spatial development sequence of the sliding surface reveal by the expansion of the plastic zone is sliding surface 4, sliding surface 5-3. The technical route and analysis scheme of this paper can be used to evaluate the stability of the gentle reverse inclined rock slope.