基于RMT－150C岩石力学试验系统上的节理岩体单轴压缩试验结果，分析了影响节理岩体单轴压缩强度的因素。节理岩体的单轴压缩强度与节理贯通度、节理倾角、节理个数等因素有关，且是一种复杂的非线性关系。同一贯通度节理岩体在节理倾角为0°时峰值强度最大；同一节理倾角岩体的峰值强度随着贯通度的增大而减小。考虑到多种因素对节理岩体单轴压缩强度的影响，建立了BP神经网络模型，对节理岩体的单轴压缩强度进行预测，然后利用遗传算法优化BP神经网络模型。通过岩石单轴压缩试验样本数据的学习，遗传算法优化的神经网络模型能够很好地预测节理岩体的单轴压缩强度。%Based on the uniaxial compression test results of jointed rock on RMT⁃150C rock mechanics test system, the factors influencing uniaxial compressive strength of joint rock had been analyzed. The uniaxial compressive strength of joint rock was related to joint continuity, joint angle and joint number and it's a complex nonlinear relationship. The peak strength of jointed rocks with same joint continuity reached to the highest value as joint angle is 0, the peak strength of jointed rocks with same joint angle decreased with the increase of joint continuity. Considering the influence of various factors on joint rock uniaxial compressive strength, the BP neural net model had been build to predict uniaxial compressive strength of joint rock and optimized by genetic algorithm. Through studying and fitting the sample data of rock uniaxial compression test, the uniaxial compressive strength of joint rock could be predicted well by BP neural net model optimized by genetic algorithm.
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