露天矿软岩力学参数退化机理及边坡稳定性评价方法研究

The strength degradation mechanism of soft rock and stability changing regularity, sliding plane development and the critical sliding parameter of slope in the engineering environment are short of effective research methods and theory analysis. For the solution of such problems, this research makes use of some sorts of the methods containing theory analysis, experiment and numerical simulation to study the deformation and instability of soft rock slope comprehensively. The innovation points of this project are: (1) The cause of deformation and instability of soft rock slope includes additional stress unloading and mechanics parameters degradation, and the geometry structure development model of composite slope established based on the mining plans is more suitable for unbalanced stress analysis and modeling of open pit mine slope, and the mechanics parameters degradation model of soft rock based on theory of aging is more accurate response the timeliness strength attenuation law of soft rock. (2) the additional stress was given based on the composite slope structure and the unbalanced stress unloading model, and the stability coefficient calculation method is established by limit equilibrium theory based on the timeliness parameters of soft rock, composite slope structure and additional stress, which can better reveal the soft rock slope stability changing rule in the process of formation. This research can provide a support for soft rock slope stability analysis and treatment of surface mine.

露天矿软岩边坡在工程环境中的强度退化机理、边坡稳定性变化规律、滑移面发育过程和关键滑移参数确定尚缺少有效的研究方法和分析理论。针对此类问题，本课题综合运用理论、实验和数值模拟等多种方法，对软岩变形和失稳等问题进行全面研究。项目的创新点为：（1）软岩边坡变形失稳的成因包括附加应力卸荷和岩体力学参数退化，基于采矿计划建立的复合边坡几何结构发展模型更加适用于露天矿不平衡应力的分析和建模；基于老化理论建立的软岩力学参数退化模型更加准确的反应软岩时效强度的衰减规律。（2）基于采矿程序确定复合边坡结构及相应的不平衡应力卸荷模型给出附加应力，基于极限平衡理论综合软岩时效参数、复合边坡结构和附加应力建立的稳定系数计算方法可以更好的揭示软岩在边坡形成过程中的稳定性变化规律。为露天矿软岩边坡稳定性分析和治理提供支持。

露天矿软岩边坡在工程环境中的强度退化机理、边坡稳定性变化规律、滑移面发育过程和关键滑移参数确定尚缺少有效的研究方法和分析理论。针对此类问题，本课题综合运用理论、实验和数值模拟等多种方法，对软岩变形和失稳等问题进行全面研究。项目的创新点为：（1）软岩边坡变形失稳的成因包括附加应力卸荷和岩体力学参数化，基于采矿计划建立的复合边坡几何结构发展模型更加适用于露天矿不平衡应力的分析和建模；基于老化理论建立的软岩力学参数退化模型更加准确的反应软岩时效强度的衰减规律。（2）基于采矿程序确定复合边坡结构及相应的不平衡应力卸荷模型给出附加应力，基于极限平衡理论综合软岩时效参数、复合边坡结构和附加应力建立的稳定系数计算方法可以更好的揭示软岩在边坡形成过程中的稳定性变化规律。为露天矿软岩边坡稳定性分析和治理提供支持。