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针对统一强度理论(UST)拟合非线性强度的局限和岩土材料强度特点,提出拟合岩土非线性强度特征的脆性剪切分析方法,建立了过渡式双线性强度分解公式。以脆断、剪切双重破坏机制,解释Hoek-Brown准则的非线性特征机制,并推导出体现岩石、岩体类材料非线性强度特征的脆剪强度公式。Mine-by隧道和北山花岗岩强度数据分析显示,在岩体折减强度、试验数据直接拟合实例分析中,脆剪强度与Hoek-Brown强度相关性系数均在0.98以上,在该基础上建立岩体非线性强度脆剪分析的双线性过渡式,并提出对应的统一强度理论形式,实现统一强度理论在拟合岩土非线性强度准则中的扩展。
Aiming at the limitation of UST fitting nonlinear strength and geotechnical material strength characteristics, a brittle shear analysis method fitting nonlinear characteristic of rock and soil is proposed and a transition bilinear intensity decomposition formula is established. The mechanism of Hoek-Brown criterion is explained by the dual failure mechanism of brittle fracture and shear. The brittle shear strength formula is deduced to show the nonlinear strength characteristics of rock and rock mass materials. The analysis of the strength data of Mine-by tunnel and Beishan granite shows that the correlation coefficient between the brittle-shear strength and Hoek-Brown strength is above 0.98 in the case of the reduction strength of rock mass and the direct fitting test data. Based on this, Bilinear transition of bulk nonlinear brittleness and shear analysis, and put forward corresponding theoretical forms of unified strength to achieve the extension of unified strength theory in fitting nonlinear strength criterion of geotechnical engineering.