摘要
在隧道开挖与支护过程的数值分析中,确定隧道开挖应力释放率是比较困难的一个问题。本文通过数值模拟方法,分析了围岩等级、开挖形状、开挖尺寸、隧道埋深以及侧压力系数等5个因素对隧道开挖应力释放率的影响程度。结果表明:影响开挖应力释放率的主要因素为围岩等级,并得到不同等级围岩隧道开挖应力释放率取值范围;其余4个因素对开挖应力释放率影响相对较小,为次要因素。因此,在数值模拟隧道开挖时,可以主要依据围岩等级来确定隧道开挖应力释放率。
Stress release ratio is difficult to confirm during the numerical analysis of tunnel excavation and support. Thus, effects on stress release ratio of tunnel excavation caused by five factors including surrounding rock grade, tunnel shape, excavation size, tunnel burial depth and lateral pressure coefficient are studied by numerical simulation. The results show that surrounding rock grade is the main factor influencing stress release ratio of tunnel excavation when the rest of the five factors have a slight influence on it. And corresponding ranges of stress release ratio to different surrounding rock grades are confirmed. So, stress release ratio of tunnel excavation can be determined by surrounding rock grade in the numerical simulation of tunnel excavation.
出处
《四川建筑科学研究》
北大核心
2017年第3期153-158,共6页
Sichuan Building Science
关键词
数值模拟
应力释放率
位移释放率
围岩等级
numerical simulation
stress release ratio
displacement release ratio
surrounding rock grade
