采空区公路下伏废弃立井混凝土球面盖帽力学性能研究  

Study on Mechanical Properties of Concrete Spherical Cap for Abandoned Shaft Under Goaf Highway

作　　者：窦国涛 窦国举 万战胜 黄勇博 DOU Guotao;DOU Guoju;WAN Zhansheng;HUANG Yongbo(School of Civil Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450046,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;China Construction Seventh Engineering Division Co.,Ltd.,Zhengzhou 450004,China;Henan Provin-cial Communications Planning&Design Institute Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]郑州航空工业管理学院土木建筑学院,河南郑州450046 [2]中国矿业大学力学与土木工程学院,江苏徐州221116 [3]中国建筑第七工程局有限公司,河南郑州450004 [4]河南省交通规划设计研究院股份有限公司,河南郑州450001

出　　处：《河南科技》2022年第19期73-76,共4页Henan Science and Technology

基　　金：河南省科技攻关项目“公路下伏废弃立井‘半球形壳体混凝土盖帽’受力机制研究”(212102310967);国家青年科学基金“基于无人机-球型自由落体式触探仪的吹填软土测试机理与应用研究”(41902266)。

摘　　要：为了研究公路下伏废弃立井混凝土球面盖帽及其平面盖板力学性能,采用ANSYS建立其有限元模型,研究不同厚度盖板、不同矢跨比盖帽以及不同填土厚度下的盖板和盖帽的力学性能,研究结果表明:①混凝土平面盖板,随着盖板厚度的增大,第一主应力极值随之减小,盖板底部中心始终会存在拉应力;②混凝土球面盖帽,当矢跨比为2∶16、3∶16、4∶16、6∶16时,混凝土球面盖帽局部存在拉应力,当矢跨比为5∶16、7∶16、8∶16时,混凝土球面盖帽整体受压,均不存在拉应力;③随着土体厚度的增大,混凝土平面盖板的拉应力随之增大,混凝土球面盖帽最大主应力绝对值随着土体厚度的增大而增大;④厚度相同时,平面盖板第一主应力极值为拉应力,且大于球面盖帽。可见:由于盖板力学特征,其底部存在拉应力,从长期考虑,会产生微裂缝,进一步导致钢筋锈蚀,危害行车安全,球面盖帽合理调整矢跨比,整体受压,耐久性能好。In order to study the mechanical properties of concrete spherical cap and plane cap of abandoned shaft under highway,the finite element model is established by ANSYS.The mechanical properties of cap and cap with different thickness,rise span ratio and fill thickness are studied.The results show that:①with the increase of cover thickness,The extreme value of the first principal stress decreases,and there will always be tensile stress in the center of the bottom of the cover plate.②For the concrete spherical cap,when the rise span ratio is 2∶16,3∶16,4∶16 and 6∶16,the concrete spherical cap has local tensile stress;when the rise span ratio is 5∶16,7∶16 and 8∶16,the concrete spherical cap is compressed as a whole and there is no tensile stress.③With the increase of soil thickness,the tensile stress of concrete plane cover plate increases;the absolute value of maximum principal stress of concrete spherical cap increases with the increase of soil thickness.④When the thickness is the same,the extreme value of the first principal stress of the plane cover plate is tensile stress,which is greater than that of the spherical cover cap.It can be seen that due to the mechanical characteristics of the cover plate,there is tensile stress at the bottom.In the long term,micro cracks will be generated,which will further lead to reinforcement corrosion and endanger driving safety.The spherical cover cap can reasonably adjust the rise span ratio,which is under overall pressure and has good durability.

关 键 词：采空区 公路 废弃立井 混凝土球面盖帽 混凝土平面盖板 

分 类 号：TD228[矿业工程—矿井建设]