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基于突变特征的边坡双强度折减系数量化研究
Quantitative research on two strength reduction factors of slope based on mutation characteristic
投稿时间:2018-03-05  修订日期:2018-05-09
DOI:
中文关键词:  边坡稳定性分析  双强度折减策略  突变理论  折减比  下限法
英文关键词:slope stability analysis  double strength reduction technique  mutation theory  reduction ratio  lower bound analysis
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
苏永华 湖南大学 yong_su1965@126.com 
李帅 湖南大学土木工程学院 shuai_li@hnu.edu.cn 
方砚兵 湖南大学土木工程学院  
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中文摘要:
      边坡失稳是一个由渐变演化至突变破坏的过程,过程中土体的强度参数c、φ发挥作用的路径和衰减程度不同。目前,双强度折减策略(DRM)在边坡稳定性评估中已逐渐形成共识,而双强度参数间的真实折减关系或折减关系求解方案仍难以准确定义。以坡体抵抗外部环境能力“最大值原理”为依据,引入非线性分析突变理论,以坡体的极限承载力为考察量,建立其与双强度折减比的突变模型函数来考察边坡整体稳定性,进而量化折减过程中c、φ折减比。结合算例,通过与已有方法的计算结果对比,验证了方法的合理性,并探究了c、φ以及坡度与折减比间演化规律及机理。研究的执行思路可对双强度折减技术的探讨提供有益参考。
英文摘要:
      Failure of slope is a process of gradual evolution to mutational destruction. The shear strength parameters c and φ have different effect paths and decay rates during the destroy process. Currently, the double strength reduction technique has reached the consensus gradually in the field of slope stability evaluation, but the real relationship of reduction between c and φ is difficult to define accurately. Based on the “maximal principle” of bearing capacity of slope to external environment, mutation theory of nonlinear analysis is introduced, ultimate bearing capacity of slope is worked as the judgment basis, the model function between reduction ratio and ultimate bearing capacity is built, and then, reduction ratio of c and φ is quantified. Utilize a slope example, rationalization of the proposed method is verified according to comparison with some reported methods. Evolvement rule and mechanism between c, φ as well as slope angle and reduction ratio are explored. The executive idea of this research may provide helpful reference for discussion of double strength reduction technique.
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