Stability evaluation of hill cut slopes along national highway-13 near Hospet,Karnataka, India

The road networks are backbone of a nation for the economic growth and safe communication. A shortest road design shall always be encouraged, but in hilly terrain, railway crossings and road crossings are constraints for the highway designers. The same problem was faced while planning a new design of National Highway-13 near the Hospet city in Karnataka, India. To resolve that problem, a twin tunnel was proposed to overcome steep gradient, sharp curve and a railway crossing. The field investigation was carried out to measure the joint parameters, lithology and ground water condition to establish the tunnel and tunnel portal stability along with hill cuttings. In the present study, the basic rock mass rating (RMR_Basic) and continuous slope mass rating (CSMR) of the slope outside tunnel portal were computed based on the field investigation for different rocks of Sandur schist belt viz. metabasics, phyllite/chlorite schist and banded iron formation. The support measures were proposed based on the computed CSMR.     

边坡岩体质量分类体系的CSMR法及应用

详细、系统地介绍边坡岩体质量评分类的CSMR法，并结合西南某水电站进水口边坡工程的实例，讨论运用CSMR系统进行边坡岩体质量分类的改进意见。实践证明，此法具有简便性和可行性，值得进一步推广。结合工程实践，并指出此法的不足之处。     

锦屏一级水电站左坝肩边坡岩体质量CSMR分类

系统地介绍边坡岩体质量评价分类的CSMR法,结合锦屏水电站左坝肩边坡工程的实例,根据结构面性质的不同细化了结构面修正系数,并引入了结构面连通率,对CSMR分类进行了修正。分析结果表明,修正后的CSMR分类更加合理。     

公路边坡岩体分级中坡高修正系数的改进

坡高与边坡稳定性有密切关系。CSMR分级体系在SMR的基础之上针对水电边坡工程引入了坡高修正系数 ,但在公路边坡分级实践中发现 ,该坡高修正系数仍有待于改进。对各类边坡可能失稳形式的力学分析 ,证明坡高修正系数 可近似表示为 =a+b/H 的形式。通过对 1 0 0余个边坡样本统计分析 ,得出两种不同岩层、坡面产状组合形式下坡高修正系数的数学表达式。经检验 ,改进后的CSMR体系能够满足公路边坡稳定性初步评价的要求。     

CSMR分级方法在边坡工程中的应用

对传统的CSMR分级方法中裂面特征和裂面间隙取值进行了改进,更好地体现了边坡岩体的岩性对边坡稳定性的影响,用该方法对312国道商—丹段K132 700~K132 850段岩质工程高边坡进行了定性评价。结果表明,该岩质工程高边坡不稳定,提出了以锚喷支护为主的主动支护方案。工程实例证实,定性评价结果可靠。     

岩体质量分级方法--CSMR法的修正及其应用

CSM R岩体质量分级方法是我国在RM R-SM R体系的基础上,引入高度修正系数和结构面条件修正系数而成,本文在阐述CSM R法应用的基础上,综合国内外对其修正的意见,提出修正的CSM R法,并通过大量的工程实例对修正的CSM R法进行校验,并回归出修正的CSM R法与RM R法的关系函数,结果表明修正后的岩体质量分级方法更适用于工程实际,可进一步推广。