岩体弹性模量尺寸效应的拟合研究

Fit Analysis on Size Effect for Modulus of Elasticity of Rock Mass

在岩石力学参数数据系统的支持下,利用4种函数对7种软、硬岩弹性模量的尺寸效应进行了拟合分析。研究结果表明:指数函数、幂函数和对数函数对硬质岩弹性模量尺寸效应的拟合效果比较理想;指数函数和对数函数对软质岩弹性模量尺寸效应的拟合效果比较理想;虽然目前尚不能提供一个适用于各种岩石的统一的力学参数尺寸效应的经验公式,但在预测大尺寸岩体力学参数时采用多个尺寸效应经验公式,对结果进行分析比较,可以得到一个较合理的岩体力学参数的取值范围。

The size effect for modulus of elasticity of seven soft, hard rock were fitted with the support of he rock mechanics parameters database system, using four fit function. It shows that the size effect for modulus of elasticity of hard rock was fitted relatively ideally with exponential function, power function and logarithm function, the size effect for modulus of elasticity of soft rock was fitted relatively ideally with exponential function and logarithm function. Although a uniform experiential formula of size effect for mechanics parameters applying all rocks cant be offered at present, a logical range of mechanics parameters of large - dimension rock mass can be calculated with several experiential formulas of size effect and comparing the results.