【摘要】 为了研究盘形滚刀掘进过程中的切削特性,对盘形滚刀侵入岩石过程进行受力分析。通过对盘形滚刀与岩石作用机理的研究,基于摩尔-库仑强度理论,分析岩石的脆性断裂过程,建立一种考虑密实核作用的刀具载荷计算模型,得到滚刀侵入破岩的力学表达式。采用颗粒离散元法建立岩石破碎全过程的二维颗粒离散元数值模型,在不同的侵入深度下,对TBM盘形滚刀的破岩过程进行数值分析。然后通过直线式盘形滚刀破岩实验台,对TBM盘形滚刀在不同侵入深度下的破岩过程进行实验研究。研究结果表明:垂直力的数学模型理论计算结果、数值模拟结果和实验结果平均误差较小,验证了所建立的受力预测力学模型的正确性和有效性。更多还原

【Abstract】 In order to study the breaking characteristics of disc cutter, the force analysis of the disc cutter intruding into the rock was carried out during the tunneling process. Through studying the breaking mechanism of the action between disk cutter and rock, the brittle fracture process of rock was analyzed based on the theory of molar-Coulomb strength. Then a tool load calculation model considering the dense core was established, and thus the mechanical expression of disc cutter intruding into hard rock was obtained. The two-dimensional numerical model of particle discrete element in the whole process of rock breaking was established by using the particle flow code(PFC) method. At different invasion depths, the process of rock breaking of tunnel boring machine(TBM) disc cutter was numerically analyzed. Then, the rock breaking process of TBM disc cutter at different invasion depths was studied by using the straight-line disc cutter rock breaking experimental platform. The results show that the average errors of vertical force obtained from mathematical models, numerical simulations and experiments are small, which verifies the correctness and validity of the established mechanical model of stress prediction.更多还原