| 张贵科,徐卫亚.重力坝纵缝非连续接触的数值模拟[J].水利学报,2005,36(8):0982-0987 |
| 重力坝纵缝非连续接触的数值模拟 |
| Numerical simulation of discontinuous contact behavior of vertical construction joints in gravity dam |
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| DOI： |
| 中文关键词: 重力坝 纵缝 非连续接触 数值模拟 变参数法 |
| 英文关键词: gravity dam vertical construction joints discontinuous contact numerical simulation variable parameters method interface element method |
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| 中文摘要: |
| 本文在六参数(法向刚度、切向刚度、粘聚力、摩擦角、剪胀角和抗拉强度)界面单元的基础上，利用给定初始应力模拟裂隙初始宽度，采用变参数法模拟裂隙闭合与张开状态下的力学行为，从而使改进后的界面单元可以模拟非连续接触问题。利用改进后的界面单元，研究了重力坝纵缝张开宽度及其分布形式、坝体并缝措施和缝面键槽对坝体变形和应力的影响。研究表明，纵缝张开宽度及其分布形式对坝体变形和应力影响显著，并缝措施会引起并缝部位应力集中，键槽可以阻止接缝面产生相对滑移。 |
| 英文摘要: |
| On the basis of interface element with 6 parameters including the normal stiffness, shear stiffness, cohesion, friction angle, dilatancy angle and tensile strength an improved interface element is suggested. The initial width of the joint opening can be simulated according to the given initial stress. The variable parameters method is used to simulate the mechanical behaviors of the opening. The improved interface element method is adopted to study the effects of width and distribution of longitudinal joints, amalgamation of joints, key grooves on deformation and stress in gravity dam with opened vertical construction joints. The study result shows that the width and distribution of joints have significant effect on the deformation and stress in gravity dam. The measure of amalgamation of joint will induce stress concentration and key grooves will restrain the sliding along the joints. |
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