两河口水电站地下厂房岩体力学特性试验研究

发布时间：2018-05-03 08:03

本文选题：岩石力学 + 力学特性　；参考：《地下空间与工程学报》2017年S2期

【摘要】：两河口水电站地下厂房位于高地应力区,地质条件复杂,厂址区岩性以粉砂质板岩为主,具有明显的层理分布特征。基于现场取样基础,开展不同层理倾角板岩的三轴试验分析,对板岩的强度特征、变形特征、弹脆性破坏模式等进行深入研究。试验成果表明:(1)厂址区板岩的强度具有显著的倾角效应,且强度离散性极大;(2)岩样弹性模量、内摩擦角和内聚力随着层理面倾角的变化都呈U形规律,在45°左右达到最低值。(3)各种倾角的板岩在试验中均表现出明显的弹脆性破坏特征。试验结果为合理选取厂房纵轴线、洞群布置、开挖支护设计、及有效控制大型地下洞群大变形破坏和围岩稳定提供依据。
[Abstract]:The underground powerhouse of Lianghekou Hydropower Station is located in the area of high ground stress and complicated geological conditions. The lithology of the site is dominated by silty slate with obvious stratigraphic distribution characteristics. On the basis of field sampling, the triaxial test analysis of slate with different bedding dip angle is carried out, and the strength characteristics, deformation characteristics and elastic-brittle failure mode of slate are deeply studied. The experimental results show that the strength of slate in the area of the plant site has a significant dip effect, and the strength is discrete and maximum. (2) the elastic modulus, the angle of internal friction and the cohesive force of the rock samples all show a U-shape law with the variation of the dip angle of the bedding plane. The slate with different dip angles at about 45 掳shows obvious elastic-brittle failure characteristics. The test results provide the basis for the rational selection of longitudinal axis of powerhouse, the layout of caverns, the design of excavation support, and the effective control of large deformation and failure of large underground caverns and stability of surrounding rock.
【作者单位】：中国电建集团成都勘测设计研究院有限公司;
【分类号】：TV223

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