摘要
连拱隧道作为公路隧道新的结构型式,理论上还不成熟。以云南省元磨高速公路的两座连拱隧道作为工程背景,按弹性阶段相似原则进行两组连拱隧道室内模型试验,包括隧道处于常规应力状态下和偏压状态下的模型试验。采用压力盒量测施工过程中隧道围岩压力,并提出了围岩压力释放率的概念,对连拱隧道开挖过程中围岩压力的变化特征进行了分析,同时对两种应力状态下的试验结果进行了对比分析。得出的结论对连拱隧道的设计和施工有积极的指导作用。
The theory of double - arch tunnel as a new structure form of highway tunnel is still unmatured up to now. According to the similar principle of elastic theory, the three-dimensional model tests simulating the excavation stage of double - arch tunnel were carried out with the background of two double - arch tunnel being constructed in the Yuanmou highway, Yunnan Province. The simple stress state and complex stress condition under oblique pressure were simulated in the test. In present paper, the distribution of stress in the wall rock mass was measured with earth - pressure cell during the tunnel excavation. An innovated rock mass pressure release rate idea was suggested. Using this method the results of the model test were analyzed. The distributions of stress in the wall rock mass of double - arch tunnel are obtained. Some valuable results have guiding significance for the design and construction of the double-arch tunnel.
出处
《地下空间与工程学报》
CSCD
2007年第1期50-54,61,共6页
Chinese Journal of Underground Space and Engineering
关键词
连拱隧道
三维地质力学模型试验
围岩压力
释放率
double - arch tunnel
3 D geo - mechanical model test
pressure of rock mass
release rate
