考虑洞室开挖效应的地下厂房岩锚梁稳定性分析与评价  

Stability Analysis and Evaluation of Rock-anchored Beam in Underground Powerhouse Considering the Effect of Cavern Excavation

作　　者：朱冬冬[1] 刘建[1] 郑晓卿[1] 艾飞[1] 卞康[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《水电能源科学》2016年第10期95-99,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51209198;51204158)

摘　　要：地下厂房建设过程中,岩锚梁作为重要建筑物,其安全稳定性一直备受关注。以乌弄龙水电站地下厂房为例,采用FLAC3D软件中的interface单元模拟岩锚梁与岩壁接触面,并考虑厂房开挖和支护与岩锚梁安装和运行的全过程。分别在岩锚梁与岩壁接触面的竖直面胶结完好、开裂两种工况下,计算分析乌弄龙地下厂房岩锚梁在运行期的稳定性,并结合监测数据进行了对比分析。结果表明,interface单元能很好地反映岩锚梁与岩壁接触面的开裂性能;岩锚梁与岩壁接触面的竖直面胶结程度对接触面上应力分布、岩锚梁受拉锚杆轴力、岩锚梁整体抗滑稳定性均有重要影响。The safety and stability of rock-anchored beam are very important for construction of underground powerhouse.The interface element of FLAC3 Dsoftware was used to simulate the contact between rock-anchored beam and rock in Wunonglong hydropower station.And the whole process of excavation and construction of the rock-anchored beam was considered.The stability of rock-anchored beam during the running period was respectively calculated under the two operating conditions including contact cements well and contact cracking.Finally,comparative analysis was carried out by the monitoring data.The results show that the interface element can reflect the cracking performance of the contract well,and the cementation degree of the contact has significant impact on stress distribution of interface,stress of pulling anchor and the anti-slide stability of rock-anchored beam.

关 键 词：地下厂房 岩锚梁 锚杆 interface单元 稳定性 

分 类 号：TV31[水利工程—水工结构工程]