摘要
压力拱是隧道工程开挖后围岩的自承载现象,对隧道稳定有着重要意义。通过数值分析可以发现,压力拱拱体内的岩体变形增长缓慢,压力拱内边界与隧道之间的岩体变形急剧增加;压力拱内边界越靠近隧道,隧道的变形量越小;压力拱厚度小,外边界处的变形也相对较小。在节理倾角分别为30°和60°及不同的节理间距条件下,压力拱位置、形态及拱体厚度均有所变化。
The arching action is a phenomenon of self-support of rock mass after excavations, which is important for the opening stability. Through numerical analysis, it is concluded that the displacement of rock mass in the area of pressure arch increases slightly, and the displacement between the inner boundary and the edge of opening increases sharply. When the inner boundary is close to the opening, the displacement of opening edge and at the outer boundary are small and the thickness is also little. Under the condition of 30° and 60° dip direction and different joint spacing, the position, shape and thickness of pressure arch are different.
出处
《西安科技大学学报》
CAS
北大核心
2008年第4期647-650,656,共5页
Journal of Xi’an University of Science and Technology
关键词
压力拱
内边界
外边界
厚度
变形
arching action
inner boundary
outer boundary
thickness
displacement
