薛雷, 秦四清, 泮晓华, 陈竑然, 杨百存, 张珂. 2018: 锁固型斜坡失稳机理及其物理预测模型. 工程地质学报, 26(1): 179-192. DOI: 10.13544/j.cnki.jeg.2018.01.020
    引用本文: 薛雷, 秦四清, 泮晓华, 陈竑然, 杨百存, 张珂. 2018: 锁固型斜坡失稳机理及其物理预测模型. 工程地质学报, 26(1): 179-192. DOI: 10.13544/j.cnki.jeg.2018.01.020
    XUE Lei, QIN Siqing, PAN Xiaohua, CHEN Hongran, YANG Baicun, ZHANG Ke. 2018: MECHANISM AND PHYSICAL PREDICTION MODEL OF INSTABILITY OF THE LOCKED-SEGMENT TYPE SLOPES. JOURNAL OF ENGINEERING GEOLOGY, 26(1): 179-192. DOI: 10.13544/j.cnki.jeg.2018.01.020
    Citation: XUE Lei, QIN Siqing, PAN Xiaohua, CHEN Hongran, YANG Baicun, ZHANG Ke. 2018: MECHANISM AND PHYSICAL PREDICTION MODEL OF INSTABILITY OF THE LOCKED-SEGMENT TYPE SLOPES. JOURNAL OF ENGINEERING GEOLOGY, 26(1): 179-192. DOI: 10.13544/j.cnki.jeg.2018.01.020

    锁固型斜坡失稳机理及其物理预测模型

    MECHANISM AND PHYSICAL PREDICTION MODEL OF INSTABILITY OF THE LOCKED-SEGMENT TYPE SLOPES

    • 摘要: 稳定性受潜在滑面上锁固段所控制的一类斜坡,称之为锁固型斜坡,其失稳机理较为直观明确,我们认为突破斜坡失稳预测这一世界性科学难题应从该类斜坡入手。本文总结了当前有关锁固型斜坡的分类研究,认为可将其分成两大体系;指出锁固型斜坡演化3阶段与锁固段变形破坏过程之间存在内在联系,其演化过程之所以出现加速蠕滑阶段,是因为锁固段损伤累积至体积膨胀点后所致;发现锁固段峰值强度点和残余强度点可视为锁固型斜坡演化进程中的两个特征灾变点,其分别对应着突发型和渐变型滑坡的发生;基于锁固段损伤本构模型和重正化群理论,导出了体积膨胀点、峰值强度点与残余强度点三者之间的量化力学联系,构建了锁固型斜坡失稳的物理预测模型;据此模型对盐池河山崩、新滩滑坡和Libby坝左坝肩楔形岩质滑坡的回溯性预测效果良好,并可合理解释其失稳机理;阐述了该模型的使用原则和配套技术方法,以便于实际应用。

       

      Abstract: The slope, whose stability is controlled by the locked segments within a potential slip surface, is referred to as the locked-segment type slope. It is well known that the instability prediction of slopes is a worldwide scientific problem. We suggest here that solving the instability prediction of the locked-segment type slope can be taken as a breakthrough because it has the explicit instability mechanism. In the present study, the classification method of locked-segment type slopes is discussed. It is pointed out that there exists an essential connection between three-phase creep development of the locked-segment type slope and the damage process of the locked segment, and that a locked-segment type slope will evolve into the tertiary creep stage when the cumulative damage of the locked segment reaches its volume dilation point. It is found that the peak strength point and the residual strength point of the locked segment can be regarded as two characteristic catastrophe points, respectively corresponding to the occurrence of the abrupt landslide and progressive one. Combining a one-dimensional renormalization group model with the strain-softening constitutive model of the locked segment, we establish the mechanical expressions among the volume dilation point, the peak strength point and the residual strength point and hence present a physical instability prediction model of locked-segment type slopes. The evolutionary mechanisms of three typical cases, the Yanchihe avalanche, the Xintan landslide and the wedge rockslide on the left abutment of Libby Dam, are reasonably explained and satisfied retrospective analysis results are obtained by the model. Finally, some related supporting techniques and applying principles about the model are introduced for actual applications.

       

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