隧道掘进机(TBM)在节理岩体中掘进, 刀盘可能被困;为了减少损失, 进行风险评估很有必要。通过刀盘被困理论分析可知, 刀盘被卡与否取决于扭矩与阻力矩的关系;阻力矩大小由塌方高度决定, 根据塌方高度的随机特性, 结合概率理论建立了刀盘被卡概率计算公式。同时, 根据塌方产生的阻力矩的大小和TBM刀盘参数, 将刀盘被困的后果分为5个等级, 并结合概率等级提出了刀盘的风险评价矩阵。通过工程实例计算, 验证了研究结果的合理性。
Abstract
The cutterhead of tunnel boring machine(TBM) working in jointed rock mass is likely to be jammed. In order to reduce the loss, risk assessment is necessary. Whether the cutterhead is jammed or not depends on the relationship between torque and resistance torque. The magnitude of resistance torque depends on the height of collapse. According to the randomicity of collapse height and the theory of probability, a formula for calculating the probability of cutterhead jamming is established. Meanwhile, according to the magnitude of resistance torque and cutterhead’s parameters, the consequences of cutterhead jamming is divided into five ranks. On the basis of probability and consequence ranks, risk assessment matrix for TBM cutterhead is proposed. The research results are verified reasonable by practical example.
关键词
隧洞塌方 /
风险评估 /
TBM刀盘 /
阻力矩 /
风险评价矩阵
Key words
tunnel collapse /
risk assessment /
TBM cutterhead /
resistance torque /
risk assessment matrix
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参考文献
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基金
国家自然科学基金资助项目(50709008);河南省教育厅科学技术研究重点项目(13A560081)
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