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地下厂房岩锚吊车梁长锚杆作用机制研究及数值模拟分析 被引量:2

Numerical simulation of long bolts for crane beam anchored in rock in underground powerhouse
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摘要 地下厂房岩锚吊车梁部位倾斜布置的长锚杆是吊车梁与岩体相互传力的重要纽带。根据长锚杆周围介质的差异将单根锚杆分为梁体段、围岩段2个部分,基于中性点理论及锚杆拉拔作用特性,研究了长锚杆、梁体混凝土和围岩三者在梁体自重荷载、岩体开挖释放荷载以及吊车轮压荷载下的联合受力机制,并建立了包含沥青介质在内的锚固体力学模型,提出了一种适用于岩锚梁稳定分析的长锚杆受力计算方法。最后采用三维弹塑性非线性有限元法,结合锚杆受力算法,以某水电站地下厂房为背景,对吊车梁施工与运行期全过程进行了数值模拟分析。工程实例计算结果能够较为合理地反映长锚杆的受力特性,锚杆受力数值结果与监测值有较好的吻合度。 The inclined long bolts for the crane beam being anchored in rock in the underground powerhouse are the important links of force transmission between the beam body and rock. A single bolt is divided into two parts: one section is surrounded by rock and another section is surrounded by the concrete of beam body. Based on the force characteristics of the bolt under the pullout load and the neutral point theory for bolts, the interactions of bolt, beam body and surrounding rock under the self-weight of beam, rock excavation load and the crane wheel were studied. A mechanical model of anchorage body including the asphalt was established. A new algorithm to calculate the forces of bolts was proposed, which is suitable for the stability analysis of crane beam anchored in rock. The numerical simulation on the force of crane beam anchored in rock during the construction and running periods was carried out with the 3D elasto-plastic nonlinear finite element method. The results of numerical simulation can reasonably reflect the stress characteristics of long bolts, and the calculated stresses in the bolts are in good agreement with the monitored values.
作者 周浩 肖明 陈俊涛 刘国庆 ZHOU Hao1,2, XIAO Ming1,2, CHEN Juntao1,2, LIU Guoqingl,2 (1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China)
出处 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2016年第12期2439-2451,共13页 Chinese Journal of Rock Mechanics and Engineering
基金 国家重点基础研究发展计划(973)项目(2015CB057900) 国家自然科学基金资助项目(51279136,51579191)
关键词 地下工程 岩锚吊车梁 长锚杆 拉拔作用 中性点理论 锚杆涂沥青 underground engineering crane beam anchored in rock long bolts bolt pull-out action neutral pointtheory: bolts daubed asphalt
作者简介 周浩(1990-),男,2012年毕业于武汉大学水利水电工程专业,现为博士研究生,主要从事地下工程与管道结构方面的研究工作。E-mail:z1025534038h@whu.edu.cn
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