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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。
Due to the length of the construction section, the higher the concrete number and the larger the pouring amount, the rock-anchor beam structure in the modern large-scale underground powerhouse is prone to temperature cracks and affects the structural safety and stability. In this regard, the finite element method was used to simulate the temperature and stress field of the rock-anchor beam. The comparison of the results with the experimental results shows that the numerical method is effective. Based on this, the numerical simulation is used to further study the rock-anchor beam temperature Stress development process and its main influence factors. The results show that the maximum temperature is one of the main factors that determine the maximum tensile stress of rock anchor beam. The higher the initial maximum temperature, the greater the tensile stress formed when the temperature decreases to a stable temperature in the late stage, and the greater the risk of cracking. The construction should take appropriate temperature control measures to reduce the maximum temperature, and reasonable control of the size of sub-seam in order to improve the anti-cracking safety of rock-anchor beam structure. The research results can provide reference for similar underground projects.