【摘要】 在对比国内外各种选取岩体力学参数方法的基础上,对黄河某高拱坝坝址区主要岩层中生代二长岩和三叠系变质砂岩采用现场原位试验和数据统计方法获取岩体力学参数。用刚性圆形承压板法进行岩体变形试验,建立了岩体纵波波速与变形模量的拟合关系,用最小二乘回归法处理变形数据。用平推法直剪试验进行岩体抗剪断强度试验,用σ-τ点群中心法处理直剪试验数据。软弱带取样后进行室内断层泥物理力学性质试验,运用岩土工程勘察规范中参数统计经验公式来获得各软弱带的抗剪参数。点群法求得的各抗剪指标总体上与原位试验得到的结果相一致,证明该法可用于岩体力学参数选取。更多还原

【Abstract】 Different determination methods of mechanical parameters of rocks at home and abroad are contrasted.In-situ tests are made on Mesozoic monzonite and Triassic metamorphic sandstone at dam site.Statistical methods are used in order to determine rock mechanical parameters.Rigid circular bearing plate is used for rock mass deformation test.Then the fitting relationships between the longitudinal wave velocity of rock masses and deformation moduli are established.Method of least square regression is used for deformation data processing.Horizontally pushing lifting jack of direct shear tests are operated on rock mass shear strength test.-center point group analysis is used for treating shear test data.Fault gouge samples obtained from the weak layers are brought to indoor lab physico-mechanical test.Shear parameters of weak intercalated layers gouge are obtained by means of statistical empirical formula in the Technical Code for Investigation of Geotechnical Engineering GB50021-2001.The shearing strength parameters obtained by point groups are generally consistent with parameters obtained by in-situ test.So it is reliable.更多还原