地下厂房岩锚梁结构温控防裂研究

发布时间：2018-01-14 05:33

本文关键词：地下厂房岩锚梁结构温控防裂研究　出处：《水电能源科学》2016年01期 　论文类型：期刊论文

【摘要】：由于施工段长度较长,混凝土标号较高、浇筑量较大,现代大型地下厂房中的岩锚梁结构较容易发生温度裂缝,影响结构安全稳定。对此,采用有限元法数值模拟了岩锚梁温度及应力场,并通过与实测结果的对比,验证了数值方法的有效性,在此基础上,采用数值模拟方法进一步研究了岩锚梁温度应力发展过程及主要影响因素。结果表明,最高温度是决定岩锚梁最大拉应力的主要因素之一,初期最高温度越高,后期降低至稳定温度时所形成的拉应力越大,开裂风险也越大。施工中应采取适当的温控措施降低最高温度,并合理控制分缝尺寸,以提高岩锚梁结构的抗裂安全。研究成果可为类似地下工程提供参考。
[Abstract]:Because the construction length of high grade concrete, pouring a large amount of rock anchor beam in underground powerhouse structure of modern large scale more prone to temperature cracks, affect the structure safety and stability. In this regard, the numerical simulation of temperature and stress field of rock anchor beam using finite element method, and through the comparison with the experimental results, proved to be effective numerical method, based on the numerical simulation method is used to further study the temperature of rock anchor beam stress development process and the main influence factors. The results show that the highest temperature is one of the main factors determining the rock anchor beam maximum tensile stress, the initial maximum temperature is higher, later reduced to a stable temperature formed when pulling the greater the stress cracking, the greater the risk is. Should take appropriate measures to reduce the temperature of the highest temperature in the construction, and the reasonable control of joint size, in order to improve the anti cracking safety of rock anchor beam structure. The research results for similar Underground works provide reference.

【作者单位】：长江勘测规划设计研究院;
【基金】：湖北省博士后创新岗位资助项目
【分类号】：TV731.6;TV315
【正文快照】： 1引言岩锚梁是现代大型水电站地下厂房中一种常见的结构形式。它利用预应力锚杆将钢筋混凝土梁体锚固在岩壁上,并将承受的荷载通过锚杆和钢筋混凝土与岩石壁面上的摩擦力传到岩体上。由于其施工段长度较长,混凝土标号较高、浇筑量大,温控防裂难度相对较大,极易产生温度裂缝,严

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