临空面辅助的TBM滚刀群掘进试验与数值模拟  

Experimental and numerical study on excavation process induced by TBM disc cutter group assisted by different free faces

作　　者：耿麒 赵振平 陈建勋[3] 刘伟伟[3] 罗彦斌[3] 马茂勋 李东 冯如兵 吴特力根 李坤 GENG Qi;ZHAO Zhenping;CHEN Jianxun;LIU Weiwei;LUO Yanbin;MA Maoxun;LI Dong;FENG Rubing;WU Teligen;LI Kun(Key Laboratory of Road Construction Technology and Equipment,Ministry of Education,Chang’an University,Xi’an 710064,China;CCCC Central-South Engineering Limited Company,Changsha 410114,China;Highway School,Chang’an University,Xi’an 710064,China)

机构地区：[1]长安大学道路施工技术与装备教育部重点实验室,陕西西安710064 [2]中交中南工程局有限公司,湖南长沙410114 [3]长安大学公路学院,陕西西安710064

出　　处：《浙江大学学报(工学版)》2025年第4期759-768,共10页Journal of Zhejiang University:Engineering Science

基　　金：国家自然科学基金资助项目(52278390);陕西省自然科学基础研究计划项目(2022JM-172);中交一公局集团项目(X-GLQSGS(J)-XIJ-WY-05-JS-80);新疆维吾尔自治区重大科技专项(2020A03003-5).

摘　　要：为了揭示临空面下全断面岩石隧道掘进机(TBM)滚刀群动态掘进效果,开展中导洞辅助下全尺度滚刀群掘进围岩室内试验,进行预切槽辅助下全尺度滚刀群掘进围岩数值模拟,评价分级刀盘式和水射流辅助式TBM的临空面辅助围岩掘进特性与效果.对于单轴抗压强度约为40 MPa的围岩,中导洞临空面结构呈“竖直—倾斜—水平—竖直”演化规律,影响区域集中在近临空面侧2~4把滚刀,临空面的临界间距和高度分别为180、130 mm,掘进推力降低10%~20%,围岩可掘进性提升6.7%~21.0%.破岩载荷随同心环预切槽深度增大而先减小后稳定,破岩效率随切槽深度增大而先提高后稳定.切槽深度的临界值为40 mm,与无预切槽情况相比,掘进推力减小至少36%,掘进效率提升至少56%.增大临空面影响范围可提升分级刀盘式TBW破岩掘进效果.To reveal the dynamic excavation performance of full-face hard rock tunnel boring machine(TBM)disc cutter group under free faces,laboratory excavation experiments were carried out on a concrete sample by a group of full-scale disc cutters assisted by a pilot hole,and numerical excavation simulations were conducted on a rock specimen by a group of full-scale disc cutters under the assistance of pre-cut kerfs.The characteristics and performances of the free-face-assisted rock excavation of the multi-stage-cutterhead TBM and the waterjet-assisted TBM were analyzed and evaluated.For the specimen with uniaxial compressive strength of approximately 40 MPa,the structure of the free face of the pilot hole follows a periodic evolution pattern of“vertical−inclined−horizontal−vertical”,and the affected area is concentrated in 2−4 disc cutters near the free face.The critical spacing and height of the free face are 180 and 130 mm,respectively.The total excavation thrust is reduced by 10%to 20%,and the boreability of the surrounding rock is improved by 6.7%to 21.0%.Under the condition of concentric-ring type pre-cut kerfs,the rock-breaking load first decreases and then stabilizes with increasing kerf depth,and the rock-breaking efficiency first increases and then stabilizes with increasing kerf depth.The critical value of pre-cut kerf depth is 40 mm,the excavation thrust decreases by a minimum of 36%,and the excavation efficiency increases by a minimum of 56%,compared with the simulation without the assistance of pre-cut kerfs.The rock excavation effectiveness of the multi-stage-cutterhead TBM can be improved by increasing the influence range of the free face.

关 键 词：全断面岩石隧道掘进机 临空面 滚刀破岩 刀盘掘进 预切槽 

分 类 号：TU94[建筑科学—建筑技术科学]