摘要
岩质陡坡后退演化是一个复杂的地质力学过程及动力地貌过程,也是山区危岩、崩塌灾害的形成机制,符合岩质边坡链式演化规律。针对单一危岩块,将危岩主控结构面类比为Ⅰ型裂纹,引入广义Kelvin蠕变模型,建立了考虑危岩蠕变效应的危岩断裂应力强度因子计算方法;针对缓倾角岩质陡坡,运用工程力学方法建立了陡坡上各危岩块所受荷载的计算方法;联合危岩主控结构面蠕变断裂应力强度因子和岩石断裂韧度,建立了危岩块崩落判据。实例分析表明,建立的岩质陡坡后退力学分析方法与实际情况基本一致。
Retreat evolution of steep rock slopes is one of complex geological mechanical and dynamic geomorphology processes and is also the dominant developing mechanism for perilous rock,collapse and avalanche in mountainous areas,in keeping with the chained regularity of rock slope evolution.The control fissure in perilous rock is regarded asⅠ-type crack for a single perilous rock block.A method to calculate the strength factor of fracture stress of rock is established considering the creep rock effect by introducing the general Kelvin model.With regard to steep rock slopes with gentle dip,based on engineering mechanics,the method to calculate loads acting on perilous rocks is established.The strength factor of fracture stress and the control fissure in perilous rock considering the creep rock effect is combined with the rock tenacity,and the criterion for collapse of perilous rock blocks on steep rock slopes is proposed.Case studies show that the mechanical mechanism for the retreat evolution of steep rock slopes is consistent with the actual one.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2010年第3期468-473,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(50678182)
重庆市重点自然科学基金项目(2008BA0015)
关键词
动力地貌学
力学机制
后退演化
岩质陡坡
断裂力学
dynamic geomorphology
mechanical mechanism
retreat evolution
steep rock slope
fracture mechanics
