Analyses and calculation of point load strength on rock mass damage index
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摘要: 根據現場點荷載強度試驗的統計結果和損傷力學原理，提出了一種新的巖體損傷度計算方法，即點荷載強度計算方法.為了驗證該方法的可靠性和準確性以及這種方法計算的巖體損傷度與巖體完整性指數之間的關系，進行了一系列理論推導和現場巖體聲波測試與實驗室巖石聲波測試.結果表明：該方法計算的損傷度與巖體完整性系數表現出很好的一致性，并且該方法計算的損傷度與巷道松動圈內巖體損傷度的變化趨勢一致.實測值與理論值之間的誤差都在7%以內，說明通過該方法計算巖體損傷度有較高的準確性和可靠性.Abstract: A new method for calculating the damage index was first proposed-point load strength method (PLSM), based on the scene point loading strength test results and the damage theory. In order to verify the reliability and accuracy of the method and demonstrate the relationship between the damage index and integrity index which has been computed using this method, a series of theoretical inferences, in-situ rock mass acoustic tests and the lab rock acoustic tests have been carried out. The results show that the damage index and rock mass integrity coefficient have good consistency. The damage index calculated by using this method is correspondent with the change trend of rock mass damage extent within the scope of the loose circle. The error value of measured and theoretical values is less than 7%. It shows that calculating the damage index through the method has high accuracy and reliability.
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Key words:
- strength damage index /
- point load strength /
- integrity coefficient /
- acoustic wave /
- joints
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參考文獻
[17] Zhang L Y, Einstein H H. Using RQD to estimate the deformation modulus of rock masses. Int J Rock Mech Min Sci, 2004, 41(2):337 [18] Hoek E, Brown E T. Practical estimates of rock mass strength. Int J Rock Mech Min Sci, 1997, 34(8):1165 [19] Zhou J W, Yang X G, Xing H G, et al. Assessment of the excavation-damaged zone in a tall rock slope using acoustic testing method. Geotech Geol Eng, 2014, 32(4):1149 -
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