应力与湿热循环耦合作用下粉砂质泥岩边坡裂隙演化机理及变形控制

粉砂质泥岩在我国南方湿热地区广泛分布，其开挖形成的路堑边坡在应力与湿热气候共同作用下，极易出现由浅入深的变形失稳现象，危害道路行车与人员安全。现有研究未充分考虑复杂赋存环境下岩体裂隙发育对力学特性的影响，在揭示裂隙粉砂质泥岩边坡变形失稳机制时存在较大局限性。鉴于此，本项目针对复杂赋存环境下裂隙粉砂质泥岩边坡的变形失稳问题，拟结合CT扫描、电镜扫描与声发射等技术，揭示应力与湿热循环耦合作用下粉砂质泥岩动态起裂、扩展及止裂的全过程时空特征与裂隙演化机理；通过单轴、三轴压缩试验，分析应力与湿热循环耦合作用下裂隙粉砂质泥岩的力学特性，建立考虑应力与湿热循环耦合效应的裂隙粉砂质泥岩弹塑性损伤本构模型；结合室内试验、现场监控及数值计算方法，分析裂隙粉砂质泥岩边坡变形破坏规律及灾变机理，提出适应复杂赋存环境下粉砂质泥岩边坡的变形控制技术。研究成果对粉砂质泥岩边坡变形控制具有重要的理论价值及科学意义。

Silty mudstone is widely distributed in the hydrothermal regions of southern China. Under coupling action of stress and hydrothermal cycle, the silty mudstone cut slopes are prone to deformation and instability from shallow to deep, which endangers road traffic and personnel safety. Existing research does not fully consider the influence of rock mass fracture development on mechanical strength under complex environments, and there are great limitations in revealing the deformation and instability mechanism of fractured silty mudstone slope. From this reason, a multiscale study of deformation and instability of fractured silty mudstone slopes subjected to complex environments is carried out. Combining CT scanning, electron microscopy scanning, and acoustic emission technology, the fracturing evolution mechanism and spatiotemporal characteristics of the silty mudstone dynamic cracking, expansion and arrest subjected to coupling action of stress and cyclic hydrothermal environments are revealed. Through uniaxial and triaxial compression tests, the mechanical properties of fractured silty mudstone subjected to coupling action of stress and cyclic hydrothermal environments are analyzed. The constitutive model of elastoplastic damage of fractured silty mudstone considering the coupling action of stress and cyclic hydrothermal environments is established. Based on the discrete element method and the discontinuous deformation analysis method, the deformation failure law and catastrophic mechanism of fractured silty mudstone slopes are analyzed. Deformation control technologies for silty mudstone slopes under complex environments are proposed. The research results have important theoretical value and scientific significance for the deformation control of silty mudstone slopes.