“三高”地区公路边坡岩体质量分级THSMR方法

THSMR Method of Highway Slope Rock Mass Classification System in “Three High” Regions

分析了边坡岩体质量分级常用的SMR,CSMR,TSMR体系特点及适用条件;在此基础上,以TSMR体系为框架,考虑地震荷载对边坡稳定性的影响,引入地震作用系数β,建立了适用于高寒、高海拔、高地震烈度的"三高"地区公路的边坡岩体质量分级体系THSMR;并以乌尉高速公路沿线34个岩质高边坡为例,通过稳定性定量计算,换算出等效RMR值——ESMR,以此为标准值,对比分析了TSMR,THSMR体系评价结果的合理性。结果表明,TSMR值普遍偏大,而THSMR值接近边坡实际稳定状态,后者更为合理。

Characteristics and applicable conditions of SMR,CSMR and TSMR system for the classification of slope rock mass were analyzed.Taking TSMR system as the framework,the influence of seismic load on the slope stability was considered,then,the seismic effect coefficientβwas introduced and THSMR method for the slope rock mass classification system suitable for the highway in“three high”regions high-alpine,high-altitude and high-intensity of earthquake was established.Finally,34 rocky high slopes along Urumchi-yuli Expressway,located in Tianshan region,were taken as a case.Through stability quantitative calculation,the equivalent RMR value:ESMR was converted out.Taking ESMR as a standard value,the rationality of results evaluated by TSMR system and THSMR system was compared and analyzed.The result show that TSMR value is generally too large and THSMR value is close to the actual stability state of the slope.Thus,THSMR system is more reasonable.