岩石地铁工程的围岩分级方法研究

发布时间：2018-05-05 06:11

  本文选题：岩石地铁工程 + 岩质围岩　； 参考：《现代隧道技术》2016年03期

【摘要】：在国标《工程岩体分级标准》的岩体质量分级基础上,文章运用图解法量化对比围岩分级方法,并结合地铁工程特点提出了反映工程跨度影响的岩石地铁工程围岩分级方法,包括:改进与调整现有围岩分级中围岩定性特征分级,同时改进各级围岩基本质量指标BQ值,使定性分级和定量分级协调一致;依据岩体质量和工程跨度分级的思想,给出区间隧道与车站隧道的亚级分级及其相应的BQ值,量化岩石地铁工程围岩自稳能力。通过对重庆轨道交通1#、6#线的围岩物理力学参数和围岩分级的调研,在同样保证安全的前提下,与国标相比,采用本文提出的岩石地铁工程围岩分级方法,区间隧道砂质泥岩有1/3的Ⅳ级围岩可以提升为Ⅲ级围岩;车站隧道砂岩约有80%的Ⅳ级围岩可以提升为Ⅲ级围岩。
[Abstract]:On the basis of the rock mass quality classification of the national standard "Engineering Rock Mass Classification Standard", this paper uses the graphic method to quantitatively contrast the surrounding rock classification method, and puts forward a rock mass classification method reflecting the influence of the engineering span on the surrounding rock mass classification method of the underground engineering combined with the characteristics of the subway engineering. It includes: improving and adjusting the qualitative characteristic classification of surrounding rock in the existing surrounding rock classification, improving the basic quality index of surrounding rock at all levels at the same time, making the qualitative classification and quantitative classification consistent, according to the idea of rock mass quality and engineering span classification, The subgrade classification of interval tunnel and station tunnel and the corresponding Bq value are given to quantify the self-stability of surrounding rock in rock subway engineering. Based on the investigation of the physical and mechanical parameters of surrounding rock and the classification of surrounding rock of Chongqing Rail Transit Line 1 #y6 #, and on the premise of the same safety, compared with the national standard, the method of surrounding rock classification proposed in this paper for rock subway engineering is adopted. About 1 / 3 of the fourth grade surrounding rock of the sandy mudstone in the interval tunnel can be upgraded to the 鈪，

本文编号：1846547