新近系弱胶结岩水理特性室内试验研究
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摘要
为揭示引黄入洛(阳)工程隧洞围岩新近系弱胶结砂岩和黏土岩的工程特性,通过对两种弱胶结岩样分别进行耐崩解性试验和膨胀性试验,深入分析其水理特性。试验结果表明:耐崩解性试验的残留试样状态为表面泥化,筛出部分状态为遇水溶解,耐崩解性指数随崩解试验循环次数的增加而逐渐降低,两种岩样都属于中等耐久性;两种岩样的自由膨胀率远小于1%,侧向约束膨胀率远小于1%,膨胀压力远小于300 kPa,两种岩样都不具有膨胀性,试验过程中,弱胶结砂岩表现为加水后顶部破坏或上表面泥化,而弱胶结黏土岩则表现为上表面泥化或无明显变化。试验表明两种岩样为中等耐崩解性、无膨胀性,不是造成围岩施工极易破坏的主要原因。
The surrounding rock of diverting the Yellow River into Luoyang mainly is Neogene weak cementation sandstone and clay rock.In order to reveal the complex engineering properties of surrounding rock,the disintegration resistance test and expansion test of weak cementation rock samples were respectively done and the water physical principles were deeply analyzed.The results show that the state of residual part of samples takes on upper surface mud,while the state of the part sifed out is dissvolved when being in water,so the samples of the studied two rocks have medium durability;and the studied two type rocks all have no expansion properties with free expansion ratio of much less than 1%,lateral restrained expansion ratio of also much less than 1%,and expansion pressure of much less than 300 kPa.In the tests,samples of mud weak cementing sandstone appear upper surface damage or upper surface mud after adding water,while samples of sandy weak cementing clay rock appear upper surface mud or no significant change.Thus the results show that the two rock samples have medium durability and no expansion properties,which is not the main reason leading to the surrounding rock easily to be failure.
The surrounding rock of diverting the Yellow River into Luoyang mainly is Neogene weak cementation sandstone and clay rock.In order to reveal the complex engineering properties of surrounding rock,the disintegration resistance test and expansion test of weak cementation rock samples were respectively done and the water physical principles were deeply analyzed.The results show that the state of residual part of samples takes on upper surface mud,while the state of the part sifed out is dissvolved when being in water,so the samples of the studied two rocks have medium durability;and the studied two type rocks all have no expansion properties with free expansion ratio of much less than 1%,lateral restrained expansion ratio of also much less than 1%,and expansion pressure of much less than 300 kPa.In the tests,samples of mud weak cementing sandstone appear upper surface damage or upper surface mud after adding water,while samples of sandy weak cementing clay rock appear upper surface mud or no significant change.Thus the results show that the two rock samples have medium durability and no expansion properties,which is not the main reason leading to the surrounding rock easily to be failure.
引文
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[3]乔翠平,孙万里.南水北调中线工程安阳渠段软岩分类研究[J].人民黄河,2012,34(8):134-136.
[4]CONSTANTINOS L,GARYFALIA K.A Failure Mechanism of the Fine Neogene Formations:an Example from Thasos,Greece[J].Landslides,2007(4):351-355.
[5]SANADA H,NAKAMURA T,SUGITA Y.Mine-by Experiment in a Deep Shaft in Neogene Sedimentary Rocks at Horonobe,Japan[J].International Journal of Rock Mechanics&Mining Sciences,2012(7):127-135.
[6]高程.第三系软弱围岩地下水环境效应研究[D].成都:西南交通大学,2013:21-25.
[7]孙晓明,武雄,何满潮,等.强膨胀性软岩的判别与分级标准[J].岩石力学与工程学报,2005,24(1):128-132.
[8]张一,常福庆,闫长斌.西霞院工程上第三系地层水文地质特征[J].资源环境与工程,2009,23(5):554-557.