摘要
文章详细分析了刀盘刀具在盾构推进过程中切削土体的受力特性,建立了一套适用于砂性土地层中深埋泥水平衡盾构刀具磨损计算方法。通过求解土体剪切破坏平衡方程,得到了单个刮刀的受力特点,并最终通过求和的方式得到了整个刀盘的理论扭矩。通过刀盘理论扭矩和实测扭矩的对比,提出了刀盘磨损系数的概念。在背景工程中的应用表明:刀盘磨损系数在0.8上下时可以持续推进;刀盘磨损系数低于0.75时呈现为快速下降的趋势;刀盘磨损系数低于0.5时,宜进行刀具更换。背景工程施工中更换刀具后,应用该方法计算的理论扭矩和实测扭矩基本接近,进一步验证了文章所提研究方法的可靠性。
This paper gives a detailed analysis of the mechanical properties of a soil mass cut by a cutterhead inthe process of shield driving and a method for calculating the cutter wear of a slurry shield that is deeply buried insandy strata. The loading features of a single cutter are obtained by the solution of a soil shear failure equilibriumequation, and then the theoretical torque of the whole cutterhead is given by way of summation. The concept of a cut-terhead wear coefficient is proposed based on the comparison of the theoretical torque and the measured torque. Ap-plication to a specific case indicates that the shield can keep driving if the cutter wear coefficient is around 0.8,while the torque tends to decline rapidly if the coefficient is lower than 0.75, and the cutting tools must be changedif the coefficient is lower than 0.5. After changing the cutting tools in the above mentioned project, the calculatedtheoretical torque is approximate to the measured torque, which further validates the reliability of the research method presented in this paper.
出处
《现代隧道技术》
EI
CSCD
北大核心
2016年第3期124-130,共7页
Modern Tunnelling Technology