外掺MgO对水工隧洞混凝土温度徐变应力的影响  

Effects of Magnesia on Thermal Creep Stress of Concrete in Hydraulic Tunnel

作　　者：陈妤 杜志达 王成山[2] CHEN Yuyang;DU Zhida;WANG Chengshan(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;Liaoning Pravincial Water Conservancy ＆ Hydropower Investigation Design ＆ Research Institute,Shenyang,Liaoning 110000,China)

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]辽宁省水利水电勘测设计研究院,辽宁沈阳110000

出　　处：《水利与建筑工程学报》2018年第4期148-153,共6页Journal of Water Resources and Architectural Engineering

摘　　要：MgO外加剂的微膨胀特性可以有效补偿混凝土自身干缩及温度变化带来的收缩应力,进而减少裂缝的产生,近年来多被应用于水利工程混凝土大坝的建设,但是将其应用于地下工程混凝土衬砌的研究却比较少见。为了探明外掺MgO混凝土在衬砌结构温度应力上的补偿效用和规律,基于ANSYS的UPFs二次开发对辽宁省某输水隧洞工程进行了长历时的混凝土温度徐变应力计算,模拟了掺加MgO和不掺加情况下隧洞衬砌混凝土的温度应力情况。仿真计算结果表明,掺加MgO对水工隧洞衬砌承受的拉应力具有一定的补偿作用,能够有效改善衬砌的受力情况。The micro-expansion characteristic of Magnesia admixture can effectively compensate the shrinkage stress caused by dry shrinkage and temperature change of concrete,and then reduce the cracks.In recent years,most of them have been used in the construction of concrete dams in hydraulic engineering,but the study of concrete lining in underground engineering is rare.In order to analyze the compensation effect and law of Magnesia concrete on the thermal stress of lining structure,based on the UPFs secondary development of ANSYS,we calculated the concrete temperature creep stress of a water conveyance tunnel in Liaoning Province for a long time,and simulated the temperature stress of tunnel lining concrete with and without Magnesia.The simulation results show that the addition of Magnesia can compensate the tensile stress of hydraulic tunnel lining to some extent,and also can effectively improve the stress of the lining.

关 键 词：MGO混凝土 隧洞衬砌 徐变应力 仿真分析 温控防裂 

分 类 号：TV424[水利工程—水工结构工程]