首页|Method for evaluation of geological strength index of carbonate cliff rocks:Coupled hyperspectral-digital borehole image technique

Method for evaluation of geological strength index of carbonate cliff rocks:Coupled hyperspectral-digital borehole image technique

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The deterioration of unstable rock mass raised interest in evaluating rock mass quality.However,the traditional evaluation method for the geological strength index(GSI)primarily emphasizes the rock structure and characteristics of discontinuities.It ignores the influence of mineral composition and shows a deficiency in assessing the integrity coefficient.In this context,hyperspectral imaging and digital panoramic borehole camera technologies are applied to analyze the mineral content and integrity of rock mass.Based on the carbonate mineral content and fissure area ratio,the strength reduction factor and integrity coefficient are calculated to improve the GSI evaluation method.According to the results of mineral classification and fissure identification,the strength reduction factor and integrity coefficient increase with the depth of rock mass.The rock mass GSI calculated by the improved method is mainly concentrated between 40 and 60,which is close to the calculation results of the traditional method.The GSI error rates obtained by the two methods are mostly less than 10％,indicating the rationality of the hyperspectral-digital borehole image coupled evaluation method.Moreover,the sensitivity of the fissure area ratio(Sr)to GSI is greater than that of the strength reduction factor(a),which means the proposed GSI is suitable for rocks with significant fissure development.The improved method reduces the influ-ence of subjective factors and provides a reliable index for the deterioration evaluation of rock mass.

Hyperspectral imageDigital panoramic borehole imageGeological strength indexCarbonate rock massQuantitative evaluation

Haiqing Yang、Guizhong Huang、Chiwei Chen、Yong Yang、Qi Wang、Xionghui Dai

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Key Laboratory of New Technology for Construction of Cities in Mountain Area,School of Civil Engineering,Chongqing University,Chongqing,400045,China

National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas,Chongqing,400045,China

Technology Innovation Center of Geohazards Automatic Monitoring,Ministry of Natural Resources(Chongqing Institute of Geology and Mineral Resources),Chongqing Engineering Research Center of Automatic Monitoring for Geological Hazards,Chongqing,401120

Technology Innovation Center of Geohazards Automatic Monitoring,Ministry of Natural Resources(Chongqing Institute of Geology and Mineral Resources),Chongqing Engineering Research Center of Automatic Monitoring for Geological Hazards,Chongqing,401120,China

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National Key R&D Program of ChinaNational Key R&D Program of China

2021YFB39014032023YFC3007203

2024

10.1016/j.jrmge.2024.08.013

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(10)