TBM盘形滚刀破岩最优贯入度的数值模拟

来源期刊:中南大学学报(自然科学版)2017年第4期

论文作者:程永亮

文章页码:936 - 944

关键词:TBM;盘形滚刀;扩展的Drucker-Prager非线性弹塑性本构模型;贯入度

Key words:TBM; disc cutter; the extended Drucker-Prager nonlinear constitutive model; penetration

摘    要:为了研究TBM盘形滚刀的破岩效率及其最优贯入度,运用有限元单元理论,采用扩展的Drucker-Prager非线性弹塑性本构模型作为岩石的本构模型,考虑包括单元删除功能的损伤失效准则,对双滚刀切削岩石的过程进行三维动态模拟,研究岩石与刀具相互作用特性。利用回转式切削实验台进行双滚刀破岩实验,验证结果的合理性。研究结果表明:当贯入度为2.0 mm时,2把滚刀的切削力基本相同;当贯入度为10.0 mm时,前把滚刀的切削力大于后把滚刀的切削力;在特定地层下,存在1个最优贯入度,使得滚刀切削比能耗最低;当贯入度为4.3 mm时,岩石裂纹能相互交汇,形成完整的碎片,切削比能耗最小;当贯入度小于4.3 mm时,岩石不能产生贯穿裂纹,形成岩脊;当贯入度大于4.3 mm时,岩石过度破碎。

Abstract: In order to study the rock fragmentation efficiency of TBM disc cutters and its optimal penetration, the finite elements theory was used and the extended Drucker-Prager nonlinear constitutive model was adopted as the rock constitutive model. Considering the damage failure criteria which includes deleting function unit, the process of double disc cutters’ rock fragmentation was simulated in three-dimensional dynamic way to study the interaction between rocks and cutters. And the rotary cutting test bench was used to perform the experiment of double disc cutters’ rock fragmentation to verify the rationality of the simulation results. The results show that at the penetration of 2.0 mm, the cutting forces of two disc cutters are almost the same. At the penetration of 10.0 mm, the cutting force of the first disc cutter is larger than that of the second disc cutter. Under certain stratum, there is an optimal penetration to make the specific energy consumption the lowest. At the penetration of 4.3 mm, rock cracks can interact with each other and complete fragments can be formed. At the same time, the specific energy consumption is the least. When the penetration is less than 4.3 mm, the cracks cannot intersect through the rocks and rock ridge is formed. When the penetration is larger than 4.3 mm, the rock is broken excessively.

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