【作者】 王林峰；

【导师】 陈洪凯；

【作者基本信息】 重庆交通大学 ， 港口、海岸及近海工程， 2012， 博士

【摘要】 复杂岩体边坡是指含多组结构面，结构破碎，力学性能较差，稳定性由各种结构面决定的岩体边坡。我国是一个多山的国家，山地丘陵占国土面积的2/3以上，所以岩体边坡失稳灾害是我国最常见的地质灾害之一，因此，岩体边坡失稳破坏常给人民的生命和财产带来了巨大的损失。本文依托两项国家自然科学基金项目“危岩破坏机理研究”（50678182）和“危岩破坏突变机制与激振效应研究”（11272185），以复杂缓倾角岩体边坡为研究对象，基于断裂力学、损伤力学、弹性力学和有限元等方法，研究了单体危岩的损伤断裂机制、岩腔后退机制、复杂岩体边坡平面和三维破坏机制，本文取得的创新性成果主要有以下几点：（1）基于断裂力学理论和可靠度基本原理建立了危岩稳定可靠度的优化求解方法；分析了危岩可靠指标和失稳概率随危岩主控结构面深度、主控结构面倾角、主控结构面深度标准差、断裂韧度和断裂韧度标准差之间的变化规律；基于断裂力学、传热学和弹性力学建立了危岩体温度场和考虑温度-应力耦合作用下的危岩稳定性计算方法；揭示了温度与主控结构面深度联合作用下的危岩稳定系数的变化规律。（2）基于弹性力学、损伤力学和传热学，建立了岩腔内软质岩体的损伤因子计算方法；分析了软质岩体的疲劳破坏机制；揭示了软质岩体内温度场分布规律和温度疲劳作用时泥岩应变的变化规律；建立了岩腔后退过程任意时刻时的危岩稳定系数和主控结构面损伤因子的计算方法。（3）分别将复杂缓倾角岩体边坡视为平面问题和三维问题，基于断裂力学和材料力学基本原理，根据各岩层不同的接触关系，以岩层挠度为中间变量，计算出岩层间层间压力和摩擦力，进而建立了各岩块平面稳定性计算方法；以岩层挠度和转角为中间变量，计算出岩层间层间压力、摩擦力和转角，并在此基础上建立了各岩块三维稳定性计的算方法；最后利用数值模拟方法验证了本文建立的复杂缓倾角岩体边坡中各岩块稳定系数计算方法的可靠性；并分析了不同岩腔深度下复杂缓倾角岩体边坡的破坏机制。本文以上研究成果可以用于复杂岩体边坡的防治工程中，为复杂岩体边坡安全性的预警和防治工程的布设提供了理论依据，增强了防治工程的针对性和有效性。更多还原

【Abstract】 Complex rock slope refers to the rock slope, which contains multi-group fissure,has poor mechanical properties and the stability determined by the fissure. China is amountainous country, with mountainous areas taking up2/3of the national total area.The rock slope failure is one of the familiar geological hazards, thus, the rock slopefailure usually renders a serious risk to human life and property loss. This papersupported by two National Natural Science Foundations: study on perilous rock failuremechanism (50678182) and study on the mutation mechanism and excitation effect ofperilous rock failure (11272185). Taking the complex gentle incline rock slope as theresearch object and basing on fracture mechanics, damage mechanics, elasticity andfinite element, this paper has studied on the damage and fracture mechanism of perilousrock, recession mechanism of rock cell and plane&3D failure mechanism of complexrock slope. The innovation achievements are obtained as follows:(1) Based on fracture mechanics and reliability basic principle, it establishedoptimization solution method of perilous rock reliability. With the change of depth andobliquity, standard deviation of depth and fracture toughness, it analyzed the variationlaw of the reliability index and unstable probability for perilous rock. According to thefracture mechanics, heat transfer theory and elastic mechanics, it established thecalculation method for the temperature field and stability of perilous rock, whichstability considered the coupling effect between the temperature and stress. Moreover, itrevealed the variation law of perilous rock’s stability under the combined effect oftemperature and the depth of perilous rock.(2) Basing on elastic mechanics, damage mechanics and heat transfer theory, itestablished the calculation method for damage factors of soft rock, analyzed the failuremechanism of soft rock; revealed the distributing law of temperature field for soft rockand established the calculation method for stability of perilous rock and the damagefactor for dominate fissure in the process of rock cell recession.(3) To respectively regard Complex rock slope as a plane problem andthree-dimensional problem, based on fracture mechanics and material mechanics,according to the contact relationship of rock layers, it calculated the pressure andfriction between the rock layers with the intermediate variable of rock layers’ deflection.And then it established the calculation method for block’s plane stability coefficient,calculated the pressure, friction and rotation angle between the rock layers with the intermediate variable of rock layers’ deflection and rotation angle and founded thecalculation method for block’s three-dimensional stability coefficient. At last, throughthe numerical simulation, it verified the effectiveness of the calculation method for thestability coefficient of block which was established in this paper and analyzed failuremechanism of complex rock slope under various depth of rock cell.The achievements can be used in the prevention and control of complex rock slope.It provides theoretical basis for the early warning of complex rock mass slope and thelayout of prevention and control engineering. Moreover, it enhances the pertinence andeffectiveness for prevention and control engineering.更多还原