不同地应力下TBM盘形滚刀破岩特性  

Mechanical characteristics of TBM disc cutter under the initial stress

作　　者：夏毅敏[1,2] 吴才章[1] 顾健健[1] 丛国强[1] 唐露[1] 张魁[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]中南大学高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2016年第2期450-458,共9页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划("973"计划)项目(2013CB035401);国家高技术研究发展计划("863"计划)项目(2012AA041801);国家自然科学基金资助项目(51274252);湖南省科技计划项目(2013GK3003)~~

摘　　要：根据Mohr-Coulomb准则分析岩石强度与地应力的变化关系,对不同地应力下盘形滚刀破岩载荷模型进行修正;以锦屏二级水电站TBM掘进现场实测的数据为依据,建立有初始地应力和无初始地应力下盘形滚刀破岩仿真模型,并进行无初始应力滚刀破岩试验,研究盘形滚刀破岩载荷特性及岩石破碎特征。研究结果表明：随着地应力的增大,三向力载荷增大;在各个贯入度下,初始应力为28～36 MPa时与0 MPa时相比,垂直力和滚动力的增加幅度较大,增大幅度可达到70%以上,侧向力增加幅度最小;随着初始地应力的增加,滚刀总破岩量减少,破岩能耗上升;三向力理论计算值与仿真值吻合较好,相对误差范围在10%～21%之间;无初始应力下的破岩试验在一定程度上验证力学模型和仿真结果的正确性。According to Mohr-Coulomb strength standard, the relationship between strength of rock and initial stress was analyzed and the rock-craking load model of disc cutter in the environment of initial stress was revised. Based on the excavating condition of TBM in Jinping secondary hydropower station, the rock-breaking simulation model under initial stress or not was established and the rock-breaking experiment without initial stress was carried out to study the load characteristic of disc cutter and the rock-breaking characteristic. The results show that the three-dimensional force increases with the increase of the initial stress; at a certain penetration depth, when the initial stress is 28-36 MPa, the vertical force and rolling force increase by a bigger margin with a rate of more than 70%, and the lateral force increases by the smallest margin compared with that of 0 MPa. With the increasement of initial stress, the total quantity of cracked rock decreases, and the energy consumed in breaking rock increases. The theoretical value and the simulation value of the three-dimensional force can fit well and the relative error of three-dimensional force ranges from 10% to 21%. The rock-craking load model and the simulation results can be verified to some extent by the rock-breaking experiment without initial stress.

关 键 词：地应力 盘形滚刀 力学模型 贯入度 三向力载荷 

分 类 号：U455.31[建筑科学—桥梁与隧道工程]