横缝对地下厂房岩锚吊车梁承载力的影响研究

发布时间：2018-07-03 16:36

本文选题：地下厂房 + 岩锚吊车梁　；参考：《长江科学院院报》2017年12期

【摘要】：某水电站地下厂房岩锚吊车梁横向裂缝问题十分突出,施工期已经产生了大量贯穿性裂缝,对其长期稳定运行存在安全隐患。根据地下厂房岩锚吊车梁设计施工实际情况,采用数值计算方法系统研究梁体在不同横向裂缝分布密度下的承载特性,分析吊车梁的变形以及受力特征。研究结果表明:横向裂缝的存在会导致梁体局部刚度降低、变形增大,在裂缝尖端附近存在一定程度的拉应力集中,梁体拉应力分布范围扩大,局部已超过容许拉应力值,而横向裂缝对梁体抗滑稳定安全系数影响有限。鉴于岩锚吊车梁需长期安全运行,对横向裂缝分布集中部位需进行加固处理。
[Abstract]:The transverse crack problem of rock anchor crane beam in underground powerhouse of a hydropower station is very prominent, and a large number of penetrating cracks have been produced during the construction period, which has hidden danger to its long-term stable operation. According to the actual conditions of design and construction of rock anchor crane beam in underground powerhouse, the bearing characteristics of beam under different transverse crack distribution density are studied systematically by numerical calculation method, and the deformation and stress characteristics of crane beam are analyzed. The results show that the existence of transverse cracks will reduce the local stiffness and increase the deformation of the beam, and there will be a certain degree of tensile stress concentration near the crack tip, and the distribution range of the tensile stress of the beam will be enlarged, and the local value of the local tensile stress will exceed the allowable tensile stress. But the transverse crack has a limited influence on the safety factor of the beam body. In view of the long term safe operation of rock anchor crane beam, it is necessary to reinforce the distribution and concentration of transverse cracks.
【作者单位】：长江科学院水利部岩土力学与工程重点实验室;河海大学力学与材料学院;长江勘测规划设计研究院枢纽设计处;
【基金】：国家自然科学基金重点项目(51539002);国家自然科学基金面上项目(51379022) 中央级公益性科研院所基本科研业务费项目(CKSF2017054/YT)
【分类号】：TV31

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