摘要
通过模型试验和理论分析,对特厚表土层双层钢板高强混凝土复合井壁的竖向受力特性进行了研究。首先,根据相似理论,进行了双层钢板高强混凝土复合井壁结构的模型设计和试件加工;然后,通过加载试验,得到了井壁结构在竖向荷载和侧压共同作用下的竖向应力、变形和强度特性。结果表明:由于内、外钢板筒的约束作用,井壁结构中的混凝土完全处于三向受压应力状态下,其抗压强度提高了1.73～1.92倍,且井壁破坏时混凝土的竖向极限压应变达到-3.9×10-3,表现出较好的延性特性。通过钢板与混凝土的相互约束,改善了各自的力学特性,使井壁竖向承载力显著提高,远比钢板筒和中间混凝土层的竖向极限承载力之和大,并根据理论分析和试验结果推导出了井壁竖向承载力的计算公式,对理论研究和工程应用具有一定的参考价值。
The vertical mechanical behavior of composite shaft lining of high strength concrete and double steel cylinder is researched by model test and theoretical analysis. According to the similarity theory,the model of composite shaft lining of high strength concrete and double steel cylinder is designed and manufactured first. Afterward,through loading test,the vertical stress,strain and strength characteristics of the composite shaft lining of high strength concrete and double steel cylinder are gained. The results indicate that the concrete compressive strength increases 1.73-1.92 times under triaxial compressive stresses state because of inner and outer steel plate cylinder restriction,and the concrete utmost compressive strain reached -3900με. The shaft lining is fairly plastic when it was damaged. By mutual restriction between steel plate and concrete,their mechanical performances are improved; and shaft lining vertical bearing capacity increased evidently,which are far greater than sum of vertical ultimate bearing capacity of steel cylinder and middle concrete. Then a formula for calculating the shaft lining ultimate bearing capacity is given on the basis of the theoretical research and experimental results. Thus,the studied results can provide a reference for the theoretical study and engineering application of this kind of shaft lining structure.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第6期1687-1691,共5页
Rock and Soil Mechanics
基金
安徽省自然科学基金资助项目(No.090414165)
安徽高校省级自然科学研究计划重点资助项目(No.KJ2008A039)
关键词
特厚表土层
竖向附加力
钢板
高强混凝土
井壁
竖向承载力
super-deep alluvium
vertical additional force
steel plate
high strength concrete
shaft lining
vertical bearing capacity
