川藏公路然乌—鲁朗段地质灾害影响因素定量分析

Quantitative analysis on the influencing factors of geological hazards in Ranwu-Lulang section of Sichuan-Tibet Highway

川藏公路然乌—鲁朗段工程地质条件极其复杂,导致大型地质灾害频繁发生。为了定量地分析各种影响因素对大型地质灾害的贡献,本文根据信息熵的理论和方法,提出了“地质灾害熵”的概念。通过详细分析川藏公路然乌—鲁朗段大型地质灾害资料,选择平均坡度、断层和节理、岩体结构、松散堆积物、水文地质条件、冰川作用和降雨等7个影响因素,分析它们对研究区某些大型地质灾害的影响程度,计算出了各影响因素的“地质灾害熵”。根据“地质灾害熵”计算得到了各影响因素的权重,在一定程度上解决了地质灾害影响因素的定量分析问题。

The engineering geological conditions are extremely complicated in Ranwu-Lulang section of Sichuan-Tibet Highway, inducing large-scale geological hazards frequently. Understanding the functions of various influencing factors in the occurrence of various large-scale geological hazards in essence will be in favor of effectively reducing and preventing various geological hazards. In order to quantitatively analyze the effect of each influencing factor in the occurrence of large-scale geological hazards, the conception of “geological hazards entropy' is brought forward on the basis of the theory and approach of information entropy. By analyzing the data of large-scale geological hazards in Ranwu-Lulang section of Sichuan-Tibet Highway in detail, 7 factors, such as average gradient, fault and joint, rock mass structure, loose accumulation, hydro-geological condition, glacier action, rainfall, are selected to study their influencing degrees to some large-scale geological hazards happened in the studying area, and the “geological hazards entropy” of every influencing factor is quantitatively worked out. On the basis of “geological hazards entropy”, the weights of all influencing factors are derived, and the problem of quantitatively analyzing various influencing factors of geological hazards is, therefore, solved in some degree.