岩石直剪实验数据处理的组合法研究

Research on combination method for experimental data processing of rock direct shear test

针对岩石力学参数不易确定的特点,对实验数据进行处理,试图找到可靠度高的参数建议值。以天然状态下的花岗岩剪切实验内聚力求取为例,提出数据组合法,对直剪实验数据进行处理。通过统计直方图分析,得到岩石内聚力实验值和内聚力的概率分布模型f(x)。与常规方法的对比分析表明,组合法可以利用少量的实验数据得到可靠度高的结果,在反映岩石抗剪强度参数不确定性的同时,降低了实验值的随机性和偶然性,能够反映岩石实际情况。

The mechanical parameters of rock are not easy to determine,therefore,the experimental data must be processed well in order to find the recommended parameters with high reliability.The data combination method is proposed to process the experimental data in rock direct shear test by the case of calculating cohesion of granite in natural state.The experimental data and the model f（x） of probability distribution of rock cohesion are obtained by the analysis of histogram in statistics.Finally,the rationality of the combination method with less experimental data is verified with the comparison to conventional method.The combination method can reflect the uncertainty of rock,at the same time the contingency and randomness of experimental values can be reduced as well.