超大直径竖井全断面掘进机施工地层扰动规律  

Study on the Ground Disturbance of Shaft Surrounding Rock Constructed by Ultra Large-diameter Shaft Boring Machine

作　　者：冯东林 刘飞香 吴怀娜 刘在政 姚满 FENG Donglin;LIU Feixiang;WU Huaina;LIU Zaizheng;YAO Man(Research Center of Underground Space Advanced Technology,Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education,Changsha 410082,China;College of Civil Engineering,Hunan University,Changsha 410082,China;China Railway Construction Heavy Industry Co.,Ltd.,Changsha 410082,China)

机构地区：[1]湖南大学地下空间开发先进技术研究中心,湖南长沙410082 [2]建筑安全与节能教育部重点实验室,湖南长沙410082 [3]湖南大学土木工程学院,湖南长沙410082 [4]中国铁建重工集团股份有限公司,湖南长沙410082

出　　处：《金属矿山》2022年第8期42-49,共8页Metal Mine

基　　金：湖南创新型省份建设专项(编号:2019GK1011);湖南省科技计划项目—创新平台与人才计划—湖湘青年人才(编号:2021RC3043);国家自然科学基金项目(编号:52122807);创新平台与人才计划—湖湘高层次人才聚集工程—创新团队(编号:2019RS1030)。

摘　　要：超大直径全断面竖井掘进机施工过程中刀盘推力会使围岩受到剧烈扰动。针对竖井掘进机施工过程进行数值模拟,探明不同围岩条件下的机—岩相互作用,围岩应力、位移场及塑性区的分布及演化规律。结果表明:围岩应力受开挖深度、围岩条件和离刀盘开挖面的距离影响,刀盘盾体与井筒结构交界处、刀盘开挖面边缘及刀盘内圈会出现应力集中现象;强风化围岩条件下围岩径向变形最大值为7.33 mm,距离竖井1D(D为竖井直径)掘进施工扰动影响可忽略;围岩塑性区范围随着围岩条件的劣化和开挖深度的增长呈扩张趋势;先导掘进装置盾体对开挖面内圈岩体形成约束,刀盘切削挤压岩体时被约束的岩体应力集中,导致内圈刀盘磨损及所需切削扭矩和推力比其他部位更大。Significant disturbance will be caused on surrounding rock during the shaft boring process by using large-diameter shaft boring machine.In this paper,a numerical model based on a shaft project constructed by large-diameter shaft boring machine was built to study on stress and radial deformation of surrounding rock in different rock condition and the rock plastic zone′s distribution and development.The result shows that the rock stress is mainly affected by excavation depth,rock condition and the distance away from the cutter-head.Stress concentration appears at the excavation face of cutter-head and the junction of shield and lining.The maximum of rock radial deformation located at the junction of shield and lining can reach 7.33 mm in highly weathered rock.At the distance of 1D(D is the shaft diameter)from the shaft,the rock deformation due to the disturbance of shaft construction can be ignored.The area of plastic zone tends to expand as the deterioration of rock condition and the increasement of excavation depth.The rock mass in the inner ring of the excavation face was restricted by the shield of pilot tunnel machine,which would lead to the stress concentration and more torque and thrust were required to break rock in this part than the others.

关 键 词：竖井掘进机 大直径竖井 数值模拟 围岩变形 塑性区 

分 类 号：TD262[矿业工程—矿井建设]