摘要
隧道开挖对岩层的级别判定,历来都存在不确定性和多解性,文章通过在高速公路隧道施工断面上划分9个分区,对每个分区确定级别加权系数,9个分区的系数之和为1,再与图纸设计的围岩级别相加,取代数和,得出初期支护所需的级别,避免了盲目估算围岩级别而产生偏差的现象。
The judgment of surrounding rock grade is indeterminacy and multi-separation for a long time during the process of tunnel excavating.In this paper, construction section of expressway tunnel is devided into 9 branch zones and each branch zone has a grade weighting coefficient and the sum of these 9 branch coefficients is 1.Then adding the surrounding rock grade of the designing drawing with the coefficients, the grade of initial supporting demand is got .In this way, the deviation of surrounding rock grade estimation could be avoided.
出处
《现代交通技术》
2008年第5期59-62,共4页
Modern Transportation Technology
关键词
隧道工程
围岩
支护参数
加权系数
地质构造
tunnel engineering
surrounding rock
supporting parameter
weighting coefficient
geological structure
