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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。
Underground plant construction process, rock anchor beam as an important building, its safety and stability has been of concern. Taking the underground workshop of Wuhu Long Hydroelectric Power Station as an example, the interface between rock anchor beam and rock wall is simulated by the interface unit in FLAC3D software, and the whole process of plant excavation and support and installation and operation of rock anchor beam is considered. The stability of the rock anchor beam in the Wulong Long underground powerhouse during operation was calculated and analyzed under the condition of good cementing and cracking of the vertical surfaces of the rock anchor beam and the rock wall respectively. The comparative analysis was made based on the monitoring data. The results show that the interface element can well reflect the cracking behavior of the interface between the rock anchor beam and the rock wall. The degree of vertical surface cementing of the rock anchor beam to the rock wall affects the stress distribution on the contact surface, Axial force, rock anchor beam overall stability have a significant impact.