一、关于黄土洞室塌方规律的认识几年来,我们在120条黄土洞室工程施工中,运用毛主席哲学思想,对片帮掉顶等各种塌方现象进行了长期观察,认真分析,反复摸索,终于找到了一些规律性的东西,使我们认识到片帮掉顶等各种塌方事故的发生主要有如下六方面因素。 1.黄土构造很复杂,由于土层的构造 I. Understanding of Loess Tunnel Collapse Laws In the past few years, during the construction of 120 loess chambers, we used Chairman Mao’s philosophy to observe long-term observations of various landslides, such as the collapse of the roof of the gang, careful analysis, and repeated exploration. Finally, we found some regular things, so that we realized that the occurrence of various landslide accidents, such as the collapse of the gangs, mainly had the following six factors. 1. The loess structure is very complicated due to the structure of the soil layer