水–岩作用下节理岩体剪切力学特性及本构模型

doi:10.13722/j.cnki.jrme.2022.0529

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摘要在库水位周期性升降变化作用下，库岸边坡消落带节理岩体长期处于浸泡–风干循环作用状态，为研究消落带节理岩体的损伤劣化特性，选取三峡库区库岸边坡消落带典型节理岩体为研究对象，进行考虑水压力升降变化和浸泡–风干循环过程的水–岩作用试验，系统分析节理岩体的剪切力学性能和微细观结构损伤演化规律。结果表明：(1) 水–岩作用下节理岩体抗剪强度呈先陡后缓的劣化趋势，总体可以分为3个阶段，其中前6个水–岩作用周期导致节理面的抗剪强度参数劣化幅度占总劣化幅度的90%左右，水–岩作用10期后，节理面抗剪强度总劣化度为30%左右。(2) 水–岩作用下节理面微细观结构损伤劣化显著，逐渐由密实状态转变为疏松多孔状态，节理面平均起伏角、平均相对起伏幅度、面积扩展率等形貌参数呈先陡后缓的劣化趋势，宏观上表现为节理面粗糙度系数JRC和岩壁强度降低，节理面上、下盘吻合度降低，进而导致了水–岩作用下节理岩体剪切性能特性逐渐劣化。(3) 基于Clough-Duncan双曲线模型，建立考虑水–岩作用损伤的节理岩体剪切本构模型，验证分析表明，该模型可较好反映水–岩作用下节理岩体剪切力学特性劣化规律。相关研究方法和结论可为库岸边坡长期变形稳定分析提供理论依据。

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	黄叶宁1
	邓华锋1
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	李建林1
	冯云杰1
	王文东1
	齐豫1

关键词 ：岩石力学, 水–岩作用, 节理岩体, 剪切特性, 本构模型

Abstract：Under the action of the periodic rise and fall of the reservoir water level，the jointed rock mass in the hydro-fluctuation belt of a bank slope has been in a state of soaking-air-drying cycle for a long time. In order to study the damage and deterioration characteristics of the jointed rock mass in the hydro-fluctuation belt，the typical jointed rock mass of a bank slope in the Three Gorges Reservoir area was selected as the research object. In this paper，a water-rock interaction test considering the water pressure fluctuation and soaking-air-drying cycle process is carried out，and the shear mechanical properties and the microstructure damage evolution law of the jointed rock mass are systematically analyzed. The results show that：(1) the shear strength of jointed rock mass under water-rock interaction shows a deterioration trend from steep to slow，which can be divided into three stages. Among them，the degradation range of the shear strength parameters of joint surface caused by the first six water-rock interaction cycles accounts for about 90% of the total degradation range，and the total degradation degree of the shear strength of joint surfaces is about 30% after 10 water-rock interaction cycles. (2) The microstructure damage of the joint surface is significantly deteriorated under water-rock interaction. It gradually changes from a dense state to a loose and porous state. The three morphological parameters of the joint surface，such as the average fluctuation angle，the average relative fluctuation amplitude and the area expansion rate，show a trend of first steep and then slow deterioration. Macroscopically，the roughness coefficient JRC of the joint surface and the strength of the rock wall are reduced，and the coincidence degree of the upper and lower walls of the joint surface is reduced，which leads to the gradual deterioration of the shear properties of jointed rock mass under water-rock interaction. (3) Based on the Clough-Duncan hyperbolic model，a shear constitutive model of jointed rock mass considering the damage of water-rock interaction is established. The verification analysis shows that the model can better reflect the deterioration law of shear mechanical properties of jointed rock mass under water-rock interaction. The relevant research methods and conclusions can provide a theoretical basis for the long-term deformation and stability analysis of reservoir bank slope.

Key words： rock mechanics water-rock interaction jointed rock mass shear properties constitutive model

引用本文:

黄叶宁1，邓华锋1，2，李建林1，冯云杰1，王文东1，齐豫1. 水–岩作用下节理岩体剪切力学特性及本构模型[J]. 岩石力学与工程学报, 2023, 42(3): 545-557.
HUANG Yening1，DENG Huafeng1，2，LI Jianlin1，FENG Yunjie1，WANG Wendong1，QI Yu1. Shear mechanical properties and constitutive model of jointed rock mass under water-rock interaction . , 2023, 42(3): 545-557.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0529 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I3/545

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