钢骨钢纤维高强砼井壁水平承载特征的计算和试验  

Numerical and experimental model studies of the horizontal bearing properties of shaft linings of encased steel or steel fiber reinforced,high strength concrete

作　　者：韩涛[1] 杨维好[1,2] 任彦龙[2] 杨志江[2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《中国矿业大学学报》2012年第2期205-211,共7页Journal of China University of Mining & Technology

基　　金：国家科技支撑计划项目(2006BAB16B01)

摘　　要：运用数值计算和模型试验方法对钢骨钢纤维高强混凝土复合井壁结构的水平承载特征进行了研究.数值计算中,井壁厚度与外半径之比、竖向应力与单轴抗压强度之比、配筋率及相邻两层钢骨之间净距与井壁厚度之比对其水平极限承载能力影响较显著;通过计算结果的回归分析,得到了其水平极限承载能力的计算公式.模型试验及分析表明:在竖向荷载加载阶段,钢骨和混凝土能协同变形;水平荷载加载阶段,钢骨应变达到屈服应变后,钢骨表现出一定的塑性流动或强化变形特征;井壁结构破坏时,钢骨和混凝土的切向应变值多为-2.3×10-3～-3.0×10-3;该种井壁结构的水平极限承载能力可运用数值计算方法进行估计.Numerical and experimental models were used to study the horizontal bearing proper- ties of shaft linings consisting of encased steel or steel fiber reinforced, high strength concrete. The calculations show that a number of non-dimensional parameters have obvious effects on the ultimate horizontal bearing capacity. These factors include the ratio of thickness to outer radi- us, of vertical stress to uniaxial compression strength, and of the spacing between adjacent lay- ers of steel ribs to total lining thickness. The reinforcement ratio also is seen to have an effect. An equation for ultimate horizontal bearing capacity was derived from the numerical results. The experimental model shows that the encased steel lining deforms in conjunction with the concrete during the vertical loading stage. During horizontal loading the encased steel shows plastic deformation at the yield stress. The shear strain in the encased steel lining approximates the strain in the concrete, --2.3）〈 10-3 to --3.0 X 10-3, when the lining is damaged. Numeri- cal analysis can be used to estimate the ultimate horizontal bearing properties of both encased steel or steel fiber reinforced, high strength concrete linings.

关 键 词：数值计算 模型试验 钢骨钢纤维混凝土 井壁结构 冲积层 极限承载 

分 类 号：TU398[建筑科学—结构工程]