基于岩石节理特征的盘形滚刀刀刃角优化
2020-10-27
作者：郝用兴，刘倩，庞永辉，刘洋，张太萍，蒋正权
单位：华北水利水电大学
摘要：为研究节理特征对岩石隧道掘进机(TBM)盘形滚刀破岩特性的影响，利用ABAQUS软件进行建模，采用修正的DmckerPrager岩石模型，在节理面间距为30mm，40mm，50mm，60mm，刀刃角为20°，30°，40°，50°，60°，70°，80°，90°时，分析节理间距和刀刃角破岩效率的影响，计算滚刀在不同情况下的比能耗。结果表明：选用不同的节理间距，岩石的破碎在节理面处均优于其他部分。节理间距一定时，比能耗的变化随刀刃角的不断增大呈波浪型变化。从破岩效率来看，在刀刃角为60°时，比能耗最低，TBM盘形滚刀的破碎效率最高；刀刃角一定时，随着节理间距的增大，比能耗不断增大，破岩效率降低；节理间距为30mm时，比能耗最小，破碎效率最高，最优刀刃角的大小随节理间距的增大，先缓慢减小后急剧增大；节理间距为30~46mm时，刀刃角变化不大，约为60°；节理间距为46~60mm时，最优刀刃角急剧变化，由58°升至73°。
关键词：节理特征；盘形滚刀；ABAQUS；破岩；比能耗
中图分类号：TG721；TH137文献标志码：ADOI：10.3969/j.issn.1000-7008.2020.09.010
Edge Optimization of Disc Hob Based on Rock Joint Features
Hao Yongxing，Liu Qian，Pang Yonghui，Liu Yang，Zhang Taiping，Jiang Zhengquan
Abstract:In order to study the influence of joint characteristics on rock breaking characteristics of rock tunnel boring machine (TBM) disc hob，this paper uses ABAQUS to model and adopt a modified DmckerPrager rock model.The joint spacing is 30mm，40mm，50mm，60mm，the cutting edge angle is 20°，30°，40°，50°，60°，70°，80°，90°.The influence of joint spacing on rock breaking efficiency under different cutting edge angles is analyzed，specific energy consumption in different situations.The results show that regardless of the joint spacing，the fracture of the rock at the joint surface is better than that of other parts.When the joint pitch is constant，the change of specific energy consumption will show a wave shape change with the increase of the blade angle.From the perspective of rock breaking efficiency，when the blade angle is 60°，the specific energy consumption is the lowest，and the TBM disc hob has the highest breaking efficiency.When the blade angle is constant，the specific energy consumption also increases with the increase of joint spacing，and the rock breaking efficiency decreases.When the joint spacing is 30mm，the specific energy consumption is the smallest and the efficiency is the highest.The size of the optimal blade angle decreases slowly and then increases sharply as the joint pitch increases.When the joint pitch is 30~46mm，the change of the blade angle is about 60°，and the change is not great.When the joint pitch is 46~60mm，the optimal blade angle changes sharply，from 58° to 73°.
Keywords:joint feature；disc hob；ABAQUS；rock breaking; specific energy consumption