消落带劣化下含锯齿状结构面岩质边坡动力响应机制研究

doi:10.13722/j.cnki.jrme.2022.0122

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摘要基于振动台模型试验，探究地震荷载持续激励和消落带劣化共同作用下含锯齿状结构面岩质边坡动力响应机制。研究表明：边坡动力响应具有“高程效应”和“趋表效应”，坡体PGA放大系数随地震荷载持续作用逐渐衰弱，而坡体累积位移、土压力及消落带孔隙水压力分别呈不断增大、减小及增大的变化规律；坡体渐进破坏演化过程表现为微裂隙萌生发育→宏观裂隙扩展贯通→宏观复合滑裂面形成后失稳破坏；坡内低、中及高起伏度锯齿状层面的滑移损伤痕迹不同，分别呈爬坡、爬坡–啃断、啃断破坏；消落带岩体地震和水冲蚀作用下预制节理张开度、劣化深度及范围不断增大并形成少数脱裂型空腔；结合坡体自振频率和阻尼比分别呈逐渐增大和减小响应规律，建立边坡岩体非线性累积损伤数学模型，将微小地震和强震作用阶段的坡体损伤度演化过程分别采用“S型”函数和“上凹型”函数表征。

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	刘新荣1
	2
	3
	王 ?1
	2
	3
	许彬1
	2
	3
	周小涵1
	2
	3
	易立4
	黄俊辉5
	王子娟6

关键词 ：边坡工程, 消落带劣化, 锯齿状结构面, 振动台模型试验, 累积损伤过程, 动力响应机制

Abstract：The shaking table model test was used to investigate the dynamic response mechanism of slopes with serrated structural planes under multiple seismic loads and degradation of rock mass. The research shows that the dynamic response of slopes has“altitude effect”and“surface effect”，and the PGA amplification factor of slopes decreases steadily under continuous seismic loads. The slope cumulative displacement，soil pressure and pore water pressure around the hydro-fluctuation belt increase，decline，and increase respectively. The progressive failure evolution of slopes is characterized by micro fracture initiation and development，macro fracture propagation and the formation of macro composite slip surface. Residual damage traces of serrated structural planes with low，medium and high undulation are different，which are climbing，gnawing off after climbing and gnawing off respectively. The opening degree of prefabricated joints continuously increases under water erosion and seismic loads，the deterioration depth and width of rock mass also continuously increase，and a few split cavities are formed locally in hydro-fluctuation belt. In addition，the natural frequency and damping ratio of the slope keep increasing and decreasing respectively. The nonlinear cumulative damage mathematical model of slope rock mass was established and the evolution process of slope damage degree in the stages of micro earthquake and strong earthquake was described by“S-type”function and“upside concave type”function respectively.

Key words： slope engineering deterioration of rock mass in hydro-fluctuation belt serrated structural planes shaking table model test cumulative damage process dynamic response mechanism

引用本文:

刘新荣1，2，3，王 ?1，2，3，许彬1，2，3，周小涵1，2，3，易立4，黄俊辉5，王子娟6. 消落带劣化下含锯齿状结构面岩质边坡动力响应机制研究[J]. 岩石力学与工程学报, 2022, 41(12): 2377-2388.
LIU Xinrong1，2，3，WANG Yan1，2，3，XU Bin1，2，3，ZHOU Xiaohan1，2，3，YI Li4， HUANG Junhui5，WANG Zijuan6. Investigation on dynamic response mechanism of slopes with serrated structural planes under degradation of rock mass in hydro-fluctuation belt. , 2022, 41(12): 2377-2388.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0122 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I12/2377

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