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在岩体工程变形分析和稳定性评价时,确定合理的岩体变形模量至关重要。现场试验可直接确定岩体的变形模量,获取的数据相对可靠,但是所需周期长、费用高,当现场试验受到各种制约条件而无法进行时,通过工程岩体分级指标估算岩体变形参数的经验方法,不失为一种经济实惠的选择。目前,国外已有大量学者通过对岩体分级方法的研究,得到了相应的岩体变形参数计算的经验公式,但在国内相关研究的开展则较少。《工程岩体分级标准》是我国岩体分级的国家标准,自1994年颁布以来,在国内岩土工程界得到了广泛的应用,但基于此分级方法来进行岩体变形参数估算方面的研究则相对较少,因此研究基于国标工程岩体分级指标预测岩体变形参数的经验公式具有广泛的应用价值。通过参考国外节理岩体变形模量的经验确定方法,吸取了相关的经验和成果,在搜集国内大型水利水电工程现场试验成果与工程岩体分级指标等相关成果基础上,结合数理统计原理,通过相关性分析,得到基于国标《工程岩体分级标准》BQ值估算岩体变形模量的经验公式。为提高预测岩体变形参数的准确性,通过对实测数据统计分析,得到了根据BQ指标、岩块弹性模量Ei估算岩体变形模量经验公式,并经三峡工程现场变形试验数据验证了该经验公式的可行性。上述研究成果为通过BQ指标估算岩体变形模量提供了一条合理的量化途径。
In the deformation analysis and stability evaluation of rock mass project, it is very important to determine the reasonable rock mass deformation modulus. Field test can directly determine the deformation modulus of rock mass, and the obtained data is relatively reliable, but the required period is long and the cost is high. When the field test can not be carried out under various constraints, the deformation of rock mass is estimated through the grading index of engineering rock mass The empirical method of parameter, after all, is an economical choice. At present, a large number of scholars abroad have obtained the empirical formulas for calculating the deformation parameters of rock mass through the research on the grading method of rock mass. However, few studies have been carried out in China. Engineering Rock Grading Standard is the national standard for grading rock mass in our country. Since it was promulgated in 1994, it has been widely used in geotechnical engineering in China. However, based on this grading method, the research on rock deformation parameter estimation Therefore, it is of great value to study the empirical formula for predicting deformation parameters of rock mass based on the grading index of national standard engineering rock mass. By referring to the empirical determination method of deformation modulus of rock joints abroad, the relevant experiences and achievements are learned. Based on the related achievements of large-scale hydroelectric projects in China and the grading index of engineering rock mass, Correlation analysis, the empirical formula for estimating the deformation modulus of rock mass based on the BQ value of national standard “Engineering Rock Mass Classification Criterion” was obtained. In order to improve the accuracy of predicting deformation parameters of rock mass, the empirical formula of rock mass deformation modulus based on BQ index and rock mass elastic modulus Ei was obtained by statistical analysis of measured data. Feasibility of empirical formula. The above research results provide a reasonable quantitative way to estimate the deformation modulus of rock mass through the BQ index.