强降雨入渗—采动卸荷耦合下高陡岩质边坡裂隙岩体破裂失稳演化机制及时间效应研究

Series of slope disasters induced by the evolution, propagation and coalescence of the original joint fissure surface of the rock mass with the long term coupling effect of intense rainfall infiltration and mining unloading put rigorous challenge to the safety mining of metal mines in Southern China during the periods of deep excavation and transferred underground mining from open pit. Taking the typical largescale high and steep jointed rock slope of Jiangxi Copper Corporation limited in Jiangxi province as the research background, relying on the synthetic study achievement of field investigation, microstructure analysis of rock mass, laboratory rock mechanical testing, large physical model experiments, numerical simulation analysis and theoretical research，the deformation and fracture evolution characteristics, rheological characteristics, engineering stability evolution mechanism and multi-field interaction characteristics of the jointed rock mass of high and steep rock slope with the coupling effect of intense rainfall infiltration and mining unloading will be emphatically illuminated. Then the scalar damage variants of unsaturated jointed rock mass will be presented with the CT values, the elastoplastic damage constitutive model and the nonlinear viscoelastic plastic rheological model of jointed rock mass will also be developed, by the correlation theories containing the equivalent continuum mechanics theory，fracture mechanics theory, damage mechanics theory, viscoelastic plastic theory, micro-mechanics theory and unsaturated earth drained shear strength theory. At last，these above research findings helps to multi-scale reveals the gradual failure mechanism of rock instability of high and steep slope under the long term complicated environmental stress, and achievements provide a scientific basis for safety maintenance and disaster prevention of the jointed rock mass of high and steep rock slope of metal mines in Southern China during the process of mining.

强降雨入渗与采动卸荷长期耦合下岩体原有节理裂隙面的演化、扩展和贯通所诱发的系列边坡灾害给我国南方地区金属矿山深凹露天与露天转地下期间的安全开采提出了严峻的挑战。本项目以江西江铜集团代表性大型裂隙高陡岩质边坡为研究背景，拟采用现场调研、岩体细观结构分析、室内岩石力学试验、大型物理模型实验、数值模拟及理论分析等方法，阐明强降雨入渗—采动卸荷耦合下高陡岩质边坡裂隙岩体的变形破裂演化特征、流变力学特性、工程稳定性演化机制及多场互响应特征。基于等效连续介质力学理论、断裂与损伤力学理论、黏弹塑性理论、细观力学理论及非饱和抗剪强度理论，推导出基于CT数的裂隙岩体标量型损伤变量的计算公式，构建裂隙岩体弹塑性损伤本构模型与非线性黏弹塑性流变模型，多尺度揭示复杂环境应力长期作用下高陡岩质边坡裂隙岩体失稳的渐进破坏机理，为我国南方地区金属矿山开采过程中裂隙高陡岩质边坡的安全维护与灾害防控提供理论依据。

强降雨入渗与采动卸荷长期耦合下岩体原有节理裂隙面的演化、扩展和贯通所诱发的系列边坡灾害给我国南方地区金属矿山深凹露天与露天转地下期间的安全开采提出了严峻的挑战。本项目以江铜集团代表性大型裂隙高陡岩质边坡为研究背景，拟采用现场调研、岩体细观结构分析、室内岩石力学试验、大型物理模型实验、数值模拟及理论分析等方法，阐明强降雨入渗—采动卸荷耦合下高陡岩质边坡裂隙岩体的变形破裂演化特征、流变力学特性、工程稳定性演化机制及多场互响应特征。基于等效连续介质力学理论、断裂与损伤力学理论、黏弹塑性理论、细观力学理论及非饱和抗剪强度理论，推导出基于CT数的裂隙岩体标量型损伤变量的计算公式，构建裂隙岩体弹塑性损伤本构模型与非线性黏弹塑性流变模型，多尺度揭示复杂环境应力长期作用下高陡岩质边坡裂隙岩体失稳的渐进破坏机理，为我国南方地区金属矿山开采过程中裂隙高陡岩质边坡的安全维护与灾害防控提供理论依据。