基于三参数强度准则的高强混凝土井壁力学特性分析

发布时间：2018-03-30 15:32

本文选题：三参数强度准则　切入点：高强混凝土井壁　出处：《广西大学学报(自然科学版)》2016年02期

【摘要】：为了分析高强混凝土井壁的力学特性,采用三参数强度准则推导出了高强混凝土立井井壁极限承载力理论解以及弹性区和塑性区应力与半径和荷载之间的解析表达式,并对计算结果进行了实验的验证。计算分析表明:在弹性区,高强混凝土井壁径向压应力σr随半径r的增大而增大,环向压应力σθ随半径r的增大而减少;在塑性区,径向压应力σr和环向压应力σθ均随半径r的增大而增大。当井壁内半径为4.0 m、厚度为1.0 m、混凝土强度等级为C60时,井壁极限承载力为22.87 MPa,井壁厚度每增加0.1 m,井壁极限承载力增加2.8 MPa左右。同时,混凝土井壁的环向压应力σθ达到164.38 MPa,是混凝土立方体单轴抗压强度的2.7倍左右,表明考虑了混凝土多轴强度影响的三参数强度准则更适用于高强混凝土井壁力学特性分析,为高强混凝土井壁结构的设计计算提供了的理论参考。
[Abstract]:In order to analyze the mechanical properties of high strength concrete shaft wall, the theoretical solution of ultimate bearing capacity of high strength concrete shaft wall and the analytical expression between stress, radius and load in elastic and plastic zone are derived by using three parameter strength criterion. The experimental results show that the radial compressive stress 蟽 r increases with the increase of radius r, and the annular compressive stress 蟽胃 decreases with the increase of radius r in the elastic zone, and in the plastic zone, the radial compressive stress 蟽 r increases with the increase of radius r, and the stress 蟽胃 decreases with the increase of radius r in the plastic zone. The radial compressive stress 蟽 r and the circumferential compressive stress 蟽胃 both increase with the increase of radius r. When the inside radius is 4.0 m, the thickness is 1.0 m, and the strength grade of concrete is C 60, the radial compressive stress 蟽 r and the circumferential compressive stress 蟽胃 increase with the increase of radius r. The ultimate bearing capacity of the shaft wall is 22.87 MPA, and the ultimate bearing capacity of the shaft wall increases about 2.8 MPa with the increase of the thickness of the shaft wall. Meanwhile, the circumferential compressive stress 蟽胃 of the concrete shaft wall reaches 164.38 MPA, which is about 2.7 times of the uniaxial compressive strength of the concrete cube. It is shown that the three-parameter strength criterion, which takes into account the influence of concrete multi-axial strength, is more suitable for the analysis of the mechanical properties of high-strength concrete shaft lining, and provides a theoretical reference for the design and calculation of high-strength concrete shaft wall structure.
【作者单位】：安徽理工大学土木建筑学院;
【基金】：国家自然科学基金资助项目(51374010;51474004)
【分类号】：TD32;TD262

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