摘要
为了对隧道围岩危险性做出准确判断,以便于现场及时采取相应工程措施,预防围岩失稳灾害的发生,将功效系数法应用于隧道围岩的稳定性评价中,对围岩失稳风险进行预警。选取岩石的单轴饱和抗压强度Rc、岩石质量指标RQD、岩体完整性系数Kv、结构面强度系数Kf、地下水作用指标、洞轴线与主要结构面的夹角θ作为评价指标,采用专家评估法确定各指标的权重系数,建立隧道围岩失稳风险预警模型。根据总功效系数的大小,将围岩失稳险情划分为巨警、重警、中警、轻警和无警5个警限。然后,运用所建预警模型对浙江省诸永高速公路西华岭隧道围岩危险性进行判断。研究结果表明:运用功效系数法对围岩危险性进行警情预测,比较符合实际,且简单易行,不失为隧道围岩稳定性评价和失稳风险预警的一种新方法,具有较高的工程应用价值。
In order to judge the dangerous situation of tunnel surrounding rock accurately,corresponding engineering measures can be performed duly to prevent the instability disaster of tunnel surrounding rock. The efficacy coefficient method is used to evaluate the stability of surrounding rock and execute instability risk early-warning of tunnel surrounding rock. Uniaxial saturated compressive strength,rock quality designation, integrity coefficient of rock mass,strength coefficient of structural plane,groundwater index and the angle between tunnel axis and main structural plane are selected as evaluation indices. The weight coefficients of evaluation indices are determined by expert evaluation method,and the early-warning model of instability risk of tunnel surrounding rock is established. The dangerous situation of surrounding rock is divided into five warning limits,i.e. huge warning,serious warning,medium warning,light warning and no warning. Then,the early-warning model of tunnel surrounding rock is applied to Xihualing tunnel of Zhuji—Yongjia highway in Zhejiang Province. The results show that the efficacy coefficient method conforms to reality and is implemented easily when it is applied to the forecast of the instability risk early-warning of tunnel surrounding rock. This new method can be used to perform stability evaluation and instability risk early-warning of tunnel surrounding rock,which has high engineering application values.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第A02期3679-3684,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
围岩失稳
功效系数法
预警
归一化权重系数
tunnelling engineering
tunnel surrounding rock instability
efficacy coefficient method
early-warning
normalized weight coefficients
