不同类型滑坡渐进破坏过程与稳定性研究
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摘要
滑坡的类型一般可分为牵引式滑坡、推移式滑坡和复合式滑坡,根据其滑面的发展形态,依次表现为前进式渐进破坏模式、后退式渐进破坏模式和复合式渐进破坏模式。基于岩土体应变软化特性,揭示了滑坡渐进破坏过程的本质是滑带力学参数弱化的过程,初步探讨了3种类型滑坡渐进破坏过程的远动特点和力学特征和滑坡渐进演化过程。以不平衡推力法和3种类型滑坡的演化特征为基础,提出3种类型滑坡渐进破坏过程中临界状态条块确定方法,通过建立滑坡渐进破坏稳定性计算模型和计算公式,提出滑坡随着渐进演化过程的滑带参数取值方法,并阐述了渐进破坏过程的稳定性计算实现过程,实现不同类型滑坡渐进破坏过程的稳定性分析。以3个典型滑坡为例,分析得出滑坡渐进破坏过程中牵引式滑坡和复合式滑坡稳定性降低速率由大到小再到大和推移式滑坡稳定性降低速率由小到大的过程,3种类型滑坡在渐进破坏过程中不同部位对稳定性的贡献不同,验证了不同类型滑坡的变形规律。研究结论可对不同类型滑坡的稳定性发展进行初步预测和为滑坡治理提供指导意义。
Deformation types of landslides generally include retrogressive landslide, load-caused landslide and complex landslide, which present regressive progressive failure mode, advancing progressive failure mode and composite progressive failure mode,respectively based on the development form of sliding zone. Based on the strain-softening behavior of sliding zone, the nature of progressive failure of landslide is weakening process of mechanical parameters of sliding zone which is revealed from the mechanical point. The movement and mechanical characteristics of three types of landslides in the process of progressive failure are determined preliminarily; and evolution process of different types of landslides are revealed. The distinguish criterion of sliding block of critical state is proposed based on the unbalanced thrust method and progressive evolution process. The calculation model and calculation formula of stability of progressive failure of landslides are established and the parameter value method of sliding zone is proposed, and the process to achieve stability calculation of the progressive failure is described. The method shows a complementary relationship in solving the stability problem of strain-softening landslides. Moreover, the progressive failure and stability variation for three typical examples of landslides are analyzed. The results show that the law of reducing speed of retrogressive landslide and complex landslide is from large to small to large; and the law of reducing speed of load-caused landslide is from small to large. In addition, the different part of landslide plays a different role on stability in the progressive failure process of three types of landslides; and the deformation regularity of different types of landslides is verified. The research results can predict the development of stability for different types of landslides preliminarily and provide guidance for landslide control.
Deformation types of landslides generally include retrogressive landslide, load-caused landslide and complex landslide, which present regressive progressive failure mode, advancing progressive failure mode and composite progressive failure mode,respectively based on the development form of sliding zone. Based on the strain-softening behavior of sliding zone, the nature of progressive failure of landslide is weakening process of mechanical parameters of sliding zone which is revealed from the mechanical point. The movement and mechanical characteristics of three types of landslides in the process of progressive failure are determined preliminarily; and evolution process of different types of landslides are revealed. The distinguish criterion of sliding block of critical state is proposed based on the unbalanced thrust method and progressive evolution process. The calculation model and calculation formula of stability of progressive failure of landslides are established and the parameter value method of sliding zone is proposed, and the process to achieve stability calculation of the progressive failure is described. The method shows a complementary relationship in solving the stability problem of strain-softening landslides. Moreover, the progressive failure and stability variation for three typical examples of landslides are analyzed. The results show that the law of reducing speed of retrogressive landslide and complex landslide is from large to small to large; and the law of reducing speed of load-caused landslide is from small to large. In addition, the different part of landslide plays a different role on stability in the progressive failure process of three types of landslides; and the deformation regularity of different types of landslides is verified. The research results can predict the development of stability for different types of landslides preliminarily and provide guidance for landslide control.
引文
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