红山窑膨胀红砂岩湿化特性试验研究  

Experimental research on slaking property of swelling red sandstone in Hongshanyao

作　　者：朱珍德[1] 邢福东[1] 张勇[1] 陈卫忠[2] 

机构地区：[1]河海大学岩土工程研究所,南京210098 [2]中国科学院岩土力学重点开放实验室,武汉430071

出　　处：《岩土力学》2005年第7期1014-1018,共5页Rock and Soil Mechanics

基　　金：国家自然科学面上基金(No.50479021);中国科学院岩土力学重点开放实验室科学基金(No.Z110306)

摘　　要：针对红山窑膨胀红砂岩具有微膨胀、易软化、易风化的特点,采用扫描电子显微镜、X射线衍射仪、MTS815.03岩石力学刚性电液伺服试验机等先进的设备为测试手段,对3种不同风化程度的膨胀红砂岩湿化过程进行观察和机理分析,从试验和机理两方面探讨膨胀红砂岩的湿化性,从而进一步阐明红砂岩膨胀性、裂隙化具有本质的区别。试验结果表明:(1)中风化红砂岩干燥时抗压强度为5.85MPa,饱和试样为0.20MPa,岩石本身强度随吸水率增加而明显下降,具有强烈的软化作用;(2)膨胀红砂岩的湿化性随胶结系数的减小而愈加强烈,与红砂岩风化程度(埋深)无关。这些研究成果对红山窑水利枢纽工程红砂岩地基开挖易裂以及边坡表层溜坍预治具有较大的指导意义。Aiming at acknowledging the slaking of expansive red sandstones in Hongshanyao hydrojunction project, by using the scanning electron microscopy, X-ray diffraction and rock mechanics rigidity electroplating servo testing system (RMTS815.03) in the tests, three different weathering degree swelling sandstones with properties of slight swelling, softening and easily weathering are observed in the process of slaking and mechanics of slaking are analyzed. Finally the slaking of red sandstone is different from swelling and fissuring essentially. Experimental results indicate that: (1) The compressive strength of the moderate weathering red sandstone, when dried, is 5.85 MPa, whereas is 0.2 MPa when saturated. The rock self strength is decreased with the increasing of water content, which is in possession of the serious softening effect; (2) The slaking of the expansive rock is strengthened with the decrease of cementation coefficient, which is irrelevant to the weathering degrees of red sandstone (the depth of embedding); (3) These studies provide the theoretical guiding to settle the slope topsoil slip of Hongshanyao hydrojunction project and also could be used in other related domain.

关 键 词：膨胀红砂岩 湿化性 湿化过程 试验 溜坍 

分 类 号：TU458[建筑科学—岩土工程]