| 几种岩石强度准则的对比分析 |
| |
| 引用本文： | 石祥超,孟英峰,李皋.几种岩石强度准则的对比分析[J].岩土力学,2011,32(Z1):209-216. |
| |
| 作者姓名： | 石祥超 孟英峰 李皋 |
| |
| 作者单位： | 西南石油大学 油气藏地质及开发工程国家重点实验室，成都 610500 |
| |
| 基金项目： | 国家高技术研究发展计划(863计划)项目气体钻井技术与装备(No.2006AA06A103);国家重大专项低渗气藏特殊复杂地层高效钻井关键技术(No.2008ZX05022-005) |
| |
| 摘 要： | 采用常规三轴试验数据，以最小平均拟合差为评价指标定量地对比分析5种强度准则描述岩石非线性强度特征的适用性。结果表明：直线型Mohr-Coulomb准则不能描述岩石强度的非线性特征；抛物线型Mohr-Coulomb虽能描述岩石强度的非线性特征，但拟合误差较大，计算所得强度参数与事实不符，不宜使用；对于中低围压（ ）下岩石强度的非线性特征，单参数Bieniawski准则拟合精度与Hoek-Brown准则相当或稍好，拟合精度接近于指数强度准则，均优于双参数Bieniawski准则；在高围压下岩石强度非线性特征较为显著，应用单参数Bieniawski 准则或Hoek-Brown准则描述误差较大，三参数Bieniawski准则和指数强度准则拟合误差较小，可用于评价深部或特深部高应力状态下岩石的强度特征。
|
| 关 键 词： | 岩石强度准则 岩石非线性强度特征 强度准则适用性 最小平均标准拟合差 |
| 收稿时间： | 2010-12-21 |
Comparative analyses of several rock strength criteria |
| |
| SHI Xiang-chao,MENG Ying-feng,LI Gao.Comparative analyses of several rock strength criteria[J].Rock and Soil Mechanics,2011,32(Z1):209-216. |
| |
| Authors: | SHI Xiang-chao MENG Ying-feng LI Gao |
| |
| Institution: | State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China |
| |
| Abstract: | Least mean standard fitting deviation is used as an evaluation index; we analyze the applicability of five conventional triaxial strength criteria to describe the nonlinear strength characteristics of rocks based on test data of ten rocks cited from public literatures. It is obvious that linear Mohr-Coulomb criterion can’t describe the nonlinear strength characteristics of rocks. Parabolic Mohr-Coulomb criterion can describe the nonlinearity feature of rock strength; but for the reason that the fitting error is very great and the parameters from calculation is not consistent with the real data; so it is not suitable to apply parabolic Mohr-Coulomb criterion in geotechnical engineering. For the nonlinear strength characteristics of rocks at low-to-moderate confining pressure level（ ）, the Bieniawski criterion with a single parameter and Hoek-Brown Criterion is better than Bieniawski Criterion with two parameters; their fitting accuracy is close to exponential strength criterion with three parameters; but they can’t be used at high confining level. When nonlinear strength characteristics are very significant under high confining pressure, the fitting deviations of Bieniawski criterion with three parameters and exponential strength criterion with three parameters are smaller; so they can be used to evaluate the strength under high geostress |
| |
| Keywords: | strength criterion of rocks nonlinear strength characteristics of rocks applicability of strength criterion least mean standard fitting deviation |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
