Full face rock tunnel boring machine（TBM） has been widely used in hard rock tunnels, however, there are few published theory about cutter-head design, and the design criteria of cutter-head under complex geological ...Full face rock tunnel boring machine（TBM） has been widely used in hard rock tunnels, however, there are few published theory about cutter-head design, and the design criteria of cutter-head under complex geological is not clear yet. To deal with the complex relationship among geological parameters, cutter parameters, and operating parameters during tunneling processes, a cutter-head load model is established by using CSM（Colorado school of mines） prediction model. Force distribution on cutter-head under a certain geology is calculated with the new established load model, and result shows that inner cutters bear more force than outer cutters, combining with disc cutters abrasion; a general principle of disc cutters＇ layout design is proposed. Within the model, the relationship among rock uniaxial compressive strength（UCS）, penetration and thrust on cutter-head are analyzed, and the results shows that with increasing penetration, cutter thrust increases, but the growth rate slows and higher penetration makes lower special energy（SE）. Finally, a fitting mathematical model of ZT（ratio of cutter-head torque and thrust） and penetration is established, and verified by TB880 E, which can be used to direct how to set thrust and torque on cutter-head. When penetration is small, the cutter-head thrust is the main limiting factor in tunneling; when the penetration is large, cutter-head torque is the major limiting factor in tunneling. Based on the new cutter-head load model, thrust and torque characteristics of TBM further are researched and a new way for cutter-head layout design and TBM tunneling operations is proposed.展开更多
The capability of several types of flat PDC cutters to withstand combined loads were tested and evaluated by the impact and cutting of single PDC cutter on granite in a linear impact cutting table. The primary failure...The capability of several types of flat PDC cutters to withstand combined loads were tested and evaluated by the impact and cutting of single PDC cutter on granite in a linear impact cutting table. The primary failure modes of PDC cutters withstanding different combined loads were investigated and analyzed. The suggestions of enhancing PDC cutters to be suitable for drilling very hard rock have been made.展开更多
目前TBM与盾构机的单滚刀推力在工程上一般通过总推力除以滚刀数量计算其平均值来表示,此方法无法反映不同安装位置滚刀受力差异,也没有考虑到盾壳摩擦力、后配套拉力等因素对单滚刀推力的影响。为了准确测量滚刀的三向载荷,在穗莞深城...目前TBM与盾构机的单滚刀推力在工程上一般通过总推力除以滚刀数量计算其平均值来表示,此方法无法反映不同安装位置滚刀受力差异,也没有考虑到盾壳摩擦力、后配套拉力等因素对单滚刀推力的影响。为了准确测量滚刀的三向载荷,在穗莞深城际宝前区间采用的双模盾构机上搭载了课题组研发的滚刀载荷监测系统,系统实时采集了滚刀沿掌子面转动的滚刀载荷,并连续监测了超过50环的盾构掘进滚刀载荷,通过计算不同监测位置的滚刀载荷,验证了滚刀载荷监测系统的各项功能。结合掌子面素描,发现掌子面存在的节理及掉块等现象在实时滚刀载荷中有显著反映,滚刀经过节理区域时,正向力显著降低至50 k N以下。通过不同岩体条件下滚刀实测载荷与计算载荷的对比,验证了滚刀载荷监测系统的准确性与可靠性。系统监测结果可为滚刀与刀盘设计、掌子面岩体条件识别等提供依据。展开更多
为了提高滚刀破岩效率,探究滚刀间距及加载方式对全断面硬岩掘进机（Full Face Rock Tunnel Boring Machine,简称TBM）滚刀破岩效果的影响.以滚刀破岩机理、岩石破碎理论为基础,选择某类花岗岩,通过有限元分析软件ABAQUS建立一系列滚刀...为了提高滚刀破岩效率,探究滚刀间距及加载方式对全断面硬岩掘进机（Full Face Rock Tunnel Boring Machine,简称TBM）滚刀破岩效果的影响.以滚刀破岩机理、岩石破碎理论为基础,选择某类花岗岩,通过有限元分析软件ABAQUS建立一系列滚刀破岩模型,对TBM刀盘结构设计进行研究,模拟不同刀间距、不同加载方式的双滚刀对破岩效果影响.通过模拟分析得出：在一定地质条件下,滚刀顺次加载和同时加载时的最优刀间距均是80mm,但是顺次加载的破岩效果要优于同时加载.通过实验数据分析得出破岩比能在刀间距为80~90mm时最小,从而验证了仿真模拟的正确性与合理性.研究成果对于探究双滚刀破岩机理、加快国内TBM设计理论与工程应用研究有一定帮助.展开更多
基金Supported by National Natural Science Foundation of China(Grant No.51275339)National Basic Research Program of China(973 Program,Grant No.2013CB035402)
文摘Full face rock tunnel boring machine（TBM） has been widely used in hard rock tunnels, however, there are few published theory about cutter-head design, and the design criteria of cutter-head under complex geological is not clear yet. To deal with the complex relationship among geological parameters, cutter parameters, and operating parameters during tunneling processes, a cutter-head load model is established by using CSM（Colorado school of mines） prediction model. Force distribution on cutter-head under a certain geology is calculated with the new established load model, and result shows that inner cutters bear more force than outer cutters, combining with disc cutters abrasion; a general principle of disc cutters＇ layout design is proposed. Within the model, the relationship among rock uniaxial compressive strength（UCS）, penetration and thrust on cutter-head are analyzed, and the results shows that with increasing penetration, cutter thrust increases, but the growth rate slows and higher penetration makes lower special energy（SE）. Finally, a fitting mathematical model of ZT（ratio of cutter-head torque and thrust） and penetration is established, and verified by TB880 E, which can be used to direct how to set thrust and torque on cutter-head. When penetration is small, the cutter-head thrust is the main limiting factor in tunneling; when the penetration is large, cutter-head torque is the major limiting factor in tunneling. Based on the new cutter-head load model, thrust and torque characteristics of TBM further are researched and a new way for cutter-head layout design and TBM tunneling operations is proposed.
基金Project(5 0 1740 5 6)supportedbytheNationalNaturalScienceFoundationofChina project(De -FG0 3 )supportedbytheNevatakUndertheDepartmentofEnergy USA
文摘The capability of several types of flat PDC cutters to withstand combined loads were tested and evaluated by the impact and cutting of single PDC cutter on granite in a linear impact cutting table. The primary failure modes of PDC cutters withstanding different combined loads were investigated and analyzed. The suggestions of enhancing PDC cutters to be suitable for drilling very hard rock have been made.
文摘目前TBM与盾构机的单滚刀推力在工程上一般通过总推力除以滚刀数量计算其平均值来表示,此方法无法反映不同安装位置滚刀受力差异,也没有考虑到盾壳摩擦力、后配套拉力等因素对单滚刀推力的影响。为了准确测量滚刀的三向载荷,在穗莞深城际宝前区间采用的双模盾构机上搭载了课题组研发的滚刀载荷监测系统,系统实时采集了滚刀沿掌子面转动的滚刀载荷,并连续监测了超过50环的盾构掘进滚刀载荷,通过计算不同监测位置的滚刀载荷,验证了滚刀载荷监测系统的各项功能。结合掌子面素描,发现掌子面存在的节理及掉块等现象在实时滚刀载荷中有显著反映,滚刀经过节理区域时,正向力显著降低至50 k N以下。通过不同岩体条件下滚刀实测载荷与计算载荷的对比,验证了滚刀载荷监测系统的准确性与可靠性。系统监测结果可为滚刀与刀盘设计、掌子面岩体条件识别等提供依据。
文摘为了提高滚刀破岩效率,探究滚刀间距及加载方式对全断面硬岩掘进机（Full Face Rock Tunnel Boring Machine,简称TBM）滚刀破岩效果的影响.以滚刀破岩机理、岩石破碎理论为基础,选择某类花岗岩,通过有限元分析软件ABAQUS建立一系列滚刀破岩模型,对TBM刀盘结构设计进行研究,模拟不同刀间距、不同加载方式的双滚刀对破岩效果影响.通过模拟分析得出：在一定地质条件下,滚刀顺次加载和同时加载时的最优刀间距均是80mm,但是顺次加载的破岩效果要优于同时加载.通过实验数据分析得出破岩比能在刀间距为80~90mm时最小,从而验证了仿真模拟的正确性与合理性.研究成果对于探究双滚刀破岩机理、加快国内TBM设计理论与工程应用研究有一定帮助.
