能量守恒原理在Ⅴ级围岩隧道衬砌设计中的应用研究
发布时间：2018-10-11 19:27
【摘要】：在围岩-衬砌这个封闭系统中,隧道的开挖和支护过程伴随着能量的传递和转化,不考虑热能散失并将围岩视为弹性体,则围岩势能的释放即为衬砌结构弹性应变能的增加。刘红燕等[1-2]利用该能量守恒原理对Ⅲ级围岩单线铁路隧道进行了衬砌厚度的计算,在此研究成果的基础上进一步研究了能量守恒原理对于Ⅴ级围岩衬砌设计的适用情况。针对Ⅴ级围岩建立FLAC3D模型动态模拟隧道的开挖过程,利用matlab语言编写弹性应变能密度函数从而得到实体模型各单元的弹性应变能,最后得到特定范围内围岩势能随掘进深度的变化曲线。由此围岩势能变化曲线可得出隧道开挖后围岩的势能释放值。此外,通过进行钢纤维混凝土(SFRC)构件的韧性试验,确定SFRC三分梁破坏与SFRC衬砌破坏时的能量消耗关系。据此建立能量方程并可得出SFRC衬砌的理论厚度,经检算,设计厚度满足安全性要求。结果表明,能量守恒原理的隧道衬砌设计方法不再受Ⅱ、Ⅲ级围岩小断面情形的限制,它同样适用于V级围岩大断面隧道的衬砌设计。
[Abstract]:In the surrounding rock lining closed system, the excavation and support process of the tunnel is accompanied by the energy transfer and transformation. If the heat loss is not considered and the surrounding rock is regarded as an elastic body, the release of the surrounding rock potential energy is the increase of the elastic strain energy of the lining structure. Liu Hongyan et al [1-2] calculated the lining thickness of single-track railway tunnel of grade 鈪，
本文编号：2264983
[Abstract]:In the surrounding rock lining closed system, the excavation and support process of the tunnel is accompanied by the energy transfer and transformation. If the heat loss is not considered and the surrounding rock is regarded as an elastic body, the release of the surrounding rock potential energy is the increase of the elastic strain energy of the lining structure. Liu Hongyan et al [1-2] calculated the lining thickness of single-track railway tunnel of grade 鈪，
本文编号：2264983
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