高地应力下岩锚吊车梁浇筑时机优化分析  

Optimization Analysis of Concrete Pouring Time of Rock-anchored Crane Beam under High Geostress

作　　者：王安亭 肖明[1] 朱奎旭 WANG Anting;XIAO Ming;ZHU Kuixu(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,Hubei,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室

出　　处：《水力发电》2019年第9期109-113,134,共6页Water Power

基　　金：国家重点基础研究计划(973)项目资助(2015CB057904);国家自然科学基金项目资助(51579191)

摘　　要：西南地区某水电站地下厂房厂区地应力水平高且水平向构造应力较强,洞室分期开挖导致的围岩应力释放必然对岩锚吊车梁的变形及应力产生很大影响。鉴于此,采用三维弹塑性损伤有限元法对不同时机浇筑岩锚梁进行研究,计算分析分期开挖中岩锚梁自身的变形和拉压锚杆应力状态。结果表明,在该地下厂房高地应力场中,岩锚梁会产生较大变形和大范围拉杆屈服现象,而延期至第6期浇筑岩锚梁可有效减小吊车梁随围岩的变形和拉压杆应力,并提高岩锚梁接触面的安全系数,保证岩锚梁的稳定运行。As high geostress level and strong horizontal tectonic stress in the underground powerhouse area of a hydropower station in Southwest China,the stress release of surrounding rock caused by the staged excavation of underground caverns will inevitably have a great impact on the deformation and stress of rock-anchored crane beam.In view of this,the three-dimensional elastoplastic damage finite element method is used to study the pouring time of crane beam,and the displacement of crane beam and the internal stress of anchors during staged excavation of caverns are analyzed respectively.The results show that,(a)the rock-anchored crane beam will produce larger deformation and the anchors will appear large-scale pull-rod yielding phenomenon;and(b)deferring the pouring time of rock-anchored beam until the sixth stage of cavern excavation can effectively reduce the deformation of crane beam and the internal stress of anchors,and improve the safety factor of contact surface between rock-anchored beam and surrounding rock to ensure the stable operation of rock-anchored crane beam.

关 键 词：岩锚吊车梁 高地应力 延期浇筑 锚杆应力 变形 安全系数 

分 类 号：TV731[水利工程—水利水电工程]