Quantitative evaluation of rock mass basic quality index considering influence of joint surface
YANG Zeliang1，LV Qing1，SHEN Jiayi2，ZHENG Jun1，LIU Jian3
(1. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Ocean College，Zhejiang University，Zhoushan，Zhejiang 316021，China；3. Zhejiang Highway and Water Transportation Engineering
Consulting Limited Liability Company，Hangzhou，Zhejiang 310006，China)
Abstract：The intactness index of rock mass is the main parameter to determine the rock mass basic quality index BQ. At present，the“national code”only considers the number of joints and does not reflect the influence of dig angel and filler on . In this paper the effects of joint number，dip angle and filler on P-wave velocity of rock mass are investigated through the P-wave velocity test of granite samples with different joints. Considering the influence of dip angle and filler，an evaluation method for quantitative calculation of is proposed. The is regarded as a random variable with normal distribution，and its relationship with is obtained through the estimated values of with a guarantee rate of 90%. The result is very similar to the recommended value of “national code”. From the aspect of rock mass mechanical strength evaluation，the applicability of this method in practical rock mass evaluation is verified. The proposed method can provide a reference for the quantitative evaluation of the rock mass basic quality BQ.
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2023, Vol. 42 
