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中文摘要：
被多组贯通结构面切割后产生的大体积破碎岩体在不同围压下仍具有一定的强度,但通过Hoek-Brown准则对其进行强度评价时,因对岩体结构划分缺乏定量描述,使得参数m与s的取值很难准确确定。在传统RQD值不足的基础上,引入不同阈值下的三维体积V.RQD值概念,建立破碎岩体质量指标V.RQD值计算机模拟方法,结合RMR评分标准和Hoek-Brown强度准则,通过探讨三维体积V.RQD值的取值范围,得到不同阈值时岩体质量参数m,s值与Hoek-Brown强度包络线以及岩体变形模量E0等之间的一些变化规律,定量化表述V.RQD值对破碎岩体强度的影响。结果表明,V.RQD值作为岩体质量指标之一,可为破碎岩体的强度估计提供新的实用途径。
英文摘要：
After being cut by some sets of structural surfaces,the large broken rock mass remains certain strength under different confining pressures.Due to the lack of quantitative description of rock structures,those parameters such as m and s values are difficult to be determined by Hoek-Brown strength criterion.Based on the defects of traditional RQD concept,by introducing the concept of 3D V.RQD under different threshold values,a kind of computer simulation method of V.RQD value was established.Then,combining RMR rating criteria and Hoek-Brown strength criterion,by discussing the influence of the threshold range of 3D V.RQD,some important laws which can lead to change of rock quality parameters such as m and s values and Hoek-Brown strength envelope as well as the rock deformation modulus E0 were achieved.As a result,an important quantitative relation between V.RQD value and broken rock mass strength was resolved.The conclusions show that the V.RQD value,one of the rock quality indices,may become a new and practical way to accurately estimate the strength of broken rock mass.
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