兩河口水電站地下廠(chǎng)房巖體力學(xué)特性試驗(yàn)研究
本文選題:巖石力學(xué) + 力學(xué)特性; 參考:《地下空間與工程學(xué)報(bào)》2017年S2期
【摘要】:兩河口水電站地下廠(chǎng)房位于高地應(yīng)力區(qū),地質(zhì)條件復(fù)雜,廠(chǎng)址區(qū)巖性以粉砂質(zhì)板巖為主,具有明顯的層理分布特征;诂F(xiàn)場(chǎng)取樣基礎(chǔ),開(kāi)展不同層理傾角板巖的三軸試驗(yàn)分析,對(duì)板巖的強(qiáng)度特征、變形特征、彈脆性破壞模式等進(jìn)行深入研究。試驗(yàn)成果表明:(1)廠(chǎng)址區(qū)板巖的強(qiáng)度具有顯著的傾角效應(yīng),且強(qiáng)度離散性極大;(2)巖樣彈性模量、內(nèi)摩擦角和內(nèi)聚力隨著層理面傾角的變化都呈U形規(guī)律,在45°左右達(dá)到最低值。(3)各種傾角的板巖在試驗(yàn)中均表現(xiàn)出明顯的彈脆性破壞特征。試驗(yàn)結(jié)果為合理選取廠(chǎng)房縱軸線(xiàn)、洞群布置、開(kāi)挖支護(hù)設(shè)計(jì)、及有效控制大型地下洞群大變形破壞和圍巖穩(wěn)定提供依據(jù)。
[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 擄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.
【作者單位】: 中國(guó)電建集團(tuán)成都勘測(cè)設(shè)計(jì)研究院有限公司;
【分類(lèi)號(hào)】:TV223
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