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由于目前的刀盘扭矩计算公式中没有考虑土体中间主应力的效应,使其理论计算值较实际偏小幅度过大。为此,笔者通过松岗-中井(SMP)准则引入中间主应力对常规三轴试验测得的内摩擦角进行修正,同时对内摩擦角修正前后的数值予以了比较,结果发现,改进后的内摩擦角与原来相比最大可提高约13%。将修正后的内摩擦角代入扭矩计算公式中,得到了土压平衡盾构刀盘扭矩计算修正模型。并针对600 mm模拟土压平衡盾构掘进机进行刀盘扭矩计算及其试验验证,结果表明,该模型的计算结果与试验测得值相吻合,与未考虑中主应力的理论相比其值增加了17%,提高了理论计算结果的精度。
As the current cutter torque calculation formula does not take into account the effect of the main soil stress in the middle, making its theoretical value is too small than the actual size is too large. Therefore, the author introduces the intermediate principal stress through the Songgang-Nakai (SMP) standard to correct the internal friction angle measured by the conventional triaxial test, and compares the values before and after the internal friction angle correction. The results show that the improved Internal friction angle compared with the original can be increased by about 13%. The corrected internal friction angle is substituted into the formula of torque calculation, and the revised model of torque calculation of cutterbar of EPB shield is obtained. The calculation of the torque on the cutterhead of 600 mm simulated earth pressure balance TBM and its test verification are carried out. The results show that the calculated results agree well with the experimental values. Compared with the theory without considering the middle principal stress 17% increase in value, improve the accuracy of the theoretical calculation results.