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为探寻云南省富宁港区泥岩库岸在水-岩相互作用下的稳定性演变规律,通过富宁港区一期工程现场采集泥岩试样,经过不同次数的干湿循环后,进行常规三轴压缩试验。将得到的岩石抗剪强度参数进行工程转换,经回归分析后构建泥岩岩体综合抗剪强度参数概率分布的时变模型。结合极限平衡法和可靠性理论,得到水-岩相互作用下泥岩库岸中值安全系数、可靠度及可靠安全系数的时变规律。分析结果表明,在水位反复升降作用下,综合二元指标的可靠安全系数能更合理地分析泥岩库岸稳定性;库岸整体稳定程度呈现出非线性衰变特点;库岸最危险滑动面表现为由内向外的渐进性破坏。以试验为基础,提出的泥岩库岸时变稳定性分析方法为研究水位周期性涨落下库岸的稳定性演变规律提供了一条有效途径。
In order to explore the evolution law of the stability of mudstone bank in Funing Harbor area of Yunnan Province under the water-rock interaction, the mudstone samples were collected on the first phase of Funing Harbor project. After different times of wet and dry cycles, Axial compression test. The obtained rock shear strength parameters are converted by engineering, and the time-varying model of the probability distribution of the comprehensive shear strength parameter of the mudstone and rock mass is constructed after regression analysis. Combined with the limit equilibrium method and the reliability theory, the time-varying law of the median safety factor, reliability and reliable safety factor of the shale banks under water-rock interaction are obtained. The analysis results show that the stability of mud bank is more reasonable under the action of repeated rising and falling of water level, and the stability of the whole bank exhibits nonlinear decay characteristics. The most dangerous slip surface of bank is Gradual destruction from the inside out. Based on the experiment, the proposed method for time-dependent stability analysis of mudstone bank provides an effective way to study the evolution law of stability of reservoir bank under the cyclic fluctuation of water level.