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岩石的流变特性是岩石的重要力学特性之一,其中岩石的长期强度是绝大多数岩土工程所必须引起重视的力学特性,然而就目前研究现状而言,与蠕变特性相比较是极不对称的。由岩石蠕变试验确定岩石的长期强度是现有最常用的方法,具有重要的现实意义。通过对完整红砂岩在CSS-2950岩石双轴流变试验机上进行的单轴压缩蠕变试验,利用过渡蠕变法、等时曲线法探讨了这些方法确定岩石长期强度在理论上的正确性和试验方法的可操作性,同时,将蠕变曲线与应力-应变曲线结合,提出了确定岩石长期强度的新方法,预测了岩石在荷载作用下可能破坏的时间。分析结果表明,将蠕变曲线与应力-应变曲线结合确定岩石长期强度对岩土工程设计具有重要的指导意义。
The rheological properties of rocks are one of the important mechanical properties of rock, in which the long-term strength of rock is the most important mechanical characteristic that must be paid attention to in geotechnical engineering. However, compared with the creep characteristics Asymmetric. Rock creep test to determine the long-term strength of rock is the most commonly used method, with important practical significance. Through uniaxial compressive creep tests of complete red sandstone on CSS-2950 rock biaxial rheological testing machine, the method of transient creep method and isochronous curve method are used to discuss the theoretical correctness of these methods in determining rock long-term strength At the same time, combining the creep curve with the stress-strain curve, a new method to determine the long-term strength of the rock is proposed and the time that the rock can be damaged under the load is predicted. The analysis results show that combining the creep curve with the stress-strain curve to determine the long-term strength of rock has an important guiding significance for geotechnical engineering design.