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四川藏区公路地处高海拔、高烈度地区,公路沿线边坡岩体受低温冻融效应以及构造断裂作用的影响,节理裂隙发育,岩体质量变化较大,为地质灾害高发区。因此选取结构面特性、岩体结构、地层岩性及组合特征、地形坡度、坡体结构、植被发育度、冻融环境特性和构造断裂带这8个因子作为岩体质量分级评价的基本指标,以此为基础建立了高海拔高烈度区公路边坡岩体质量分级评价体系,提出了“岩体质量指数RQI”方法。结合对四川藏区公路沿线边坡岩体质量的调查,运用该体系对四川藏区边坡进行了稳定性评价适用性分析。该评价体系的定量评价与现场的定性分析总体一致,取得了较好效果。
Sichuan Tibet Highway is located in high altitude and high intensity areas. The slope rock mass along the highway is affected by the low temperature freezing and thawing effect and tectonic fracture. The joint fissures develop and the mass of rock mass changes greatly, which is the high incidence area of geological disasters. Therefore, the eight factors of structural plane characteristics, rock mass structure, stratigraphic lithology and assemblage characteristics, topography gradient, slope structure, vegetation development degree, freeze-thaw environment characteristics and tectonic fault zone are selected as the basic indexes of rock mass grading evaluation. Based on this, the evaluation system of rock mass grading of highway slope in high altitude and high intensity area was established, and the “RQI” method of rock mass index was put forward. Based on the investigation of the rock mass quality along the slope along the highway in the Tibetan area of Sichuan Province, this paper analyzes the suitability of the stability evaluation of the slope in the Tibetan area of Sichuan. The quantitative evaluation of the evaluation system and the on-site qualitative analysis generally agree, and achieved good results.