摘要
为合理地对围岩评价分类,结合当前围岩稳定性分析方法的优劣,研究采用围岩6个评价指标:岩石单轴饱和抗压强度Rc、围岩质量指标RQD值、结构面摩擦系数Jf、节理间距Jd、地下水状态W、完整性系数Kv建立评价模型,将围岩稳定状态划分为5个等级。选用理想点法计算围岩的贴近度,以此衡量围岩的稳定性强弱,通过熵权理论确定评价体系中相应指标的权重,该模型便于实现计算机处理。工程应用表明,基于熵权法和理想点法的判别模型与BQ法评价结果相一致,能够很好地反映围岩的稳定状态,可为工程实践提供科学依据。
Forrationally assessingthe stability of surrounding rocks,this paper adopts the following six factors, rock uniaxial compressive strengthRc, rock quality designation RQD, friction coefficient of the structural plane Jr, joint distance Jd, groundwater condition W, and integrity coefficient Kv, to classifythe stabilityof surrounding rocks into five levels after considering the advantages and disadvantages of existing assessment methods. In this paper, the weight of each factor is determined using the entropy weight theory, while the stability of surrounding rocks is calculated by the ideal point method through their closeness degree. This model is convenient for computer processing. Engineering application shows that the evaluation result is consistent with that of the BQ method, and it can better reflect the real state of rocksand provide scientific basis for engineering practice.
出处
《科技导报》
CAS
CSCD
北大核心
2014年第20期64-68,共5页
Science & Technology Review
关键词
围岩稳定性
熵权理论
理想点法
贴近度
BQ法
stability of surrounding rocks
entropy weight theory
ideal point method
closeness degree
BQ method
