摘要
目前,在单层衬砌设计中应用较为广泛的是基于挪威法的Q系统支护设计法,但该方法涉及的参数有6个,在施工前及施工过程中测试这些参数经验性较强,准确性不高,而且费用较高;将Q法直接移植到中国的单层衬砌设计困难较大,不适合中国国情。在此背景下,提出以屈服接近度和围岩松动圈支护理论为基础的单层衬砌设计原则和方法,并结合合武铁路大别山隧道2号斜井进行了工程实践。首先通过地质勘查得到隧道所在地区的工程地质、水文地质特征以及围岩的物理力学指标,确定隧道围岩的屈服接近度,进而提出单层衬砌支护参数及喷射混凝土的力学控制指标,完成结构的预设计;根据隧道施工过程中实测的围岩松动圈范围,运用松动圈支护理论修正设计,从而形成一套完整的单层衬砌设计方法体系。实践表明,提出的单层衬砌设计方法经济适用、对施工干扰小,适合信息化施工,且施作完成的单层衬砌结构安全可靠,具有显著的经济效益和社会效益,有较大的推广前景。
At present, the Q system supporting design method based on Norwegian tunneling method is widely used in single layer lining, but this method involving 6 parameters, which can＇t be tested accuracy before or during cnstruction and the testing cost is high. So the Q system supporting design method is not suit for China＇s single layer lining design. At this background, the design principle and design methodology for single layer lining based on yield approach index and the support theory based on broken rock zone are put forward; and the engineering practice combining with Dabieshan tunnel inclined shafts No.2 on the Hefei-Wuhan railway is executive too. During the research, engineering condition, hydrogeology condition and physico-mechanical indices of surrounding rock where the tunnel located must be got by geological prospecting at first; then the supporting parameters of single layer lining and mechanical index for shotcrete is presented which will form the structure＇s pre-design. During the actual process of construction, according to the broken rock zone range which is field tested and then use support theory based on broken rock zone to modify the design, a complete single layer lining design system will form. The practice shows that the design method of single layer lining proposed is economical and applicable; and the interference for construction is low which suits information construction. On the other hand, the single layer lining structure completed is safe and reliable, and it will make notable economic and social benefits in engineering application; it is worthwhile to be popularized.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第4期1062-1068,共7页
Rock and Soil Mechanics
基金
铁道部科技研究开发项目(No.2003G038)
关键词
隧道
单层衬砌
设计方法
屈服接近度
围岩松动
tunnel
single layer lining
design methodology
yield approach index
broken rock zone
