基于震裂损伤程度的公路崩塌识别方法

Identification of Highway Collapse Based on Degree of Seismic Damage

震后地震区公路沿线发育的地质灾害主要以崩塌灾害为主,不仅发生频率高,而且规模大、破坏强。根据实地调研震后公路沿线崩塌灾害的发育特征,选择对崩塌识别的主要影响因素进行了分析。选取主控结构面倾角、地形坡度、结构面特性、凹腔发育特征、岩性及组合特征、岩体结构和震裂损伤程度7个因素作为崩塌识别的基本指标,采用层次分析法半定量地研究了指标之间相互作用关系对崩塌识别的影响权重和指标重要性程度。提出了公路崩塌识别的崩塌判别指数CDI方法,建立了震后公路崩塌的识别体系。该识别体系运用到公路沿线崩塌隐患点的定量评价与现场的定性分析总体一致,表明该识别体系是对震后公路崩塌进行快速识别的有效方法。

The geological disaster development along the road in seismic region after earthquake is mainly collapse disaster, not only high frequencies of occurrence, but also large scale and strong destruction. According to the field investigation about the development characteristics of collapse along highway after earthquake, the major influencing factors of collapse identification are chosen ancl analyzed. Taking dip angel of control structural plane, gradient of geomorphology, characteristics of structural plane, development characteristics of recessed cavity, feature of lithology and assemblages, rockmass structure, degree of seismic damage as the basic indicators of collapse identification, the influence weight of collapse identification and index importance degree are semi-quantitatively analyzed by using AHP based on the interaction relationship among indexes. The collapse discrimination index CDI method for highway collapse identification is put forward, and the identification system of collapse after earthquake is built. The quantitative evaluation of the identification system applied to the hidden trouble area of collapse along highway and the field qualitative analysis is general consistent, which shows that this identification system is an effective and rapid method of collapse after earthquake.