芙蓉江大桥拱座混凝土–基岩抗滑稳定性研究  

SLIDING STABILITY ANALYSIS OF CEMENTED CONCRETE-ROCK JOINT BETWEEN SKEWBACK AND BEDROCK OF FURONGJIANG BRIDGE

作　　者：田洪铭[1] 陈卫忠[1,2] 郑朋强[1] 于建新[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《岩石力学与工程学报》2014年第7期1407-1414,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金青年科学基金资助项目(51309217);国家自然科学基金杰出青年科学基金资助项目(51225902);国家重点基础研究发展计划(973)项目(2013CB036006)

摘　　要：通过对混凝土–岩石胶结面剪切破坏过程中剪应力–位移曲线的分析,假设混凝土–岩石胶结面剪应力由混凝土与岩石之间的胶结作用和摩擦效应共同承担,从而建立考虑峰后胶结损伤的胶结面力学模型。室内混凝土–岩石剪切试验结果的反演分析表明,该模型可以很好地反映胶结面剪切破坏过程。利用建立的混凝土–岩石胶结面力学模型,对拟建的芙蓉江大桥拱座抗滑稳定性进行三维计算分析,结果表明:桥梁荷载下拱座–基岩胶结面剪切应力小于其抗剪强度,胶结面变形以弹性变形为主,量值较小,拱座–基岩胶结面不会产生剪切破坏。Based on the analysis of shear stress-displacement curve of cemented concrete-rock joint, an assumption is proposed that the shear stress of cemented concrete-rock joint is dependent on the bonding strength and the friction effect of the cohesive interface. A new model of cemented concrete-rock joint considering the bonding degradation after peak stress is therefore established. The comparison of results of back analysis using the proposed model with ones from shear tests shows that the proposed model could describe the entire process of failure of cemented concrete-rock joint. Besides, a stability analysis of the foundation of Furongjiang Bridge is carried out using the proposed model. The numerical results show that the shear stress between the skewback and the bedrock from the bridge loading is smaller than its shear strength; and the shear displacement has a very low value, which indicates a safe bridge foundation.

关 键 词：岩石力学 混凝土–岩石胶结面 抗滑稳定性 拱桥拱座 胶结损伤 

分 类 号：TU45[建筑科学—岩土工程]