佛子岭抽水蓄能水电站地下厂房施工开挖过程的FLAC^(3D)数值模拟

Numerical simulation with FLAC^(3D) on construction and excavation process of underground powerhouse of Fuziling pumped storage hydropower station

选取佛子岭抽水蓄能水电站地下厂房区,采用三维快速拉格朗日法(FLAC3D)模拟施工开挖过程,研究了洞室群围岩的开挖变形形态和应力状态,分析了围岩和调压井高边坡在自重荷载作用下的开挖稳定性。通过对地下厂房洞室群区的加固处理,分析了围岩在加固后的力学特性。利用FLAC3D程序的Ubiquitous模型,引入了一组主要节理裂隙,分析了此组节理裂隙对地下洞室群围岩的开挖变形及整体稳定性的影响,并与无节理裂隙的数值模拟结果进行对比,综合评价了节理裂隙对洞室群围岩稳定性的影响。

The construction and excavation process of underground powerhouse of Fuziling Pumped Storage Hydropower Station are simulated by three-dimensional fast Lagrangian method（FLAC^3D）. The pattern of deformation caused by excavation and stress state in surrounding rock mass are studied, The stabilities of surrounding rock mass of the powerhouse and the high slope of the surge chamber are analyzed. The bolting supports are performed on the region of the underground powerhouse caverns; and the mechanical properties of the reinforced surrounding rock mass are analyzed. By using the Ubiquitous model of FLAC^3D program, we introduce a major joint cranny to surrounding rock mass and analyze the excavation deformation and the integral stability of the underground powerhouse caverns. Compared the numerical simulation results with no joint cranny around the surrounding rock mass, the effects of joint cranny on the stability of surrounding rock mass are evaluated comprehensively.