天山公路边坡岩体质量评价TSMR体系研究

STUDY OF TIANSHAN SLOPE ROCK MASS RATING(TSMR) SYSTEM

天山公路地处高寒高海拔地区,冻融作用十分强烈。因此,在对天山公路沿线边坡进行稳定性评价时必须考虑冻融作用的影响。在天山公路沿线100余个边坡统计分析的基础上,以RMR,SMR及CSMR岩体质量评价体系为框架,运用数理统计分析手段对坡高修正系数ξ及结构面条件系数λ进行系统的调整,并引入冻融系数δ,建立适用于天山公路的边坡岩体质量评价体系TSMR。同时,TSMR体系还根据边坡的稳定性等级提出针对性的支护建议。应用结果表明,TSMR体系误判率远低于SMR体系,因此更适合于高寒高海拔地区公路边坡稳定性的评价。

Tianshan highway is located in high altitudes and cold region where freeze-thaw action is very strong, so it is important to take the influence of freeze thaw action into account when evaluating the side slope stability along the Tianshan highway. On the basis of statistical analysis of more than 100 slopes in Tianshan highway, a new rock mass rating system-TSMR, which is suitable for the slope stability evaluation of Tianshan highway, is established. With the RMR, SMR and CSMR rock mass rating systems, the correction coefficient ξ of slope height and condition coefficient 2. of structure plane are adjusted by using mathematical statistics tools; and freeze-thaw coefficient δ is also introduced. At the same time, several pertinent supporting recommendations are proposed in TSMR system according to slope stability levels. Application results show that misjudgment rate of TSMR system is lower than that of the RMR-SMR system, thus the results are acceptable for slope stability evaluation in high altitudes and cold region.