摘要
目前隧道设计主要采用工程类比法,即依据围岩级别选取相应的支护参数,但对于某些特殊地段,需进行特殊的论证和设计。以杨岗1号隧道进口浅埋偏压段为工程背景,通过强度折减法计算隧道在未采取任何措施情况下和采取反压回填后其安全系数大小及塑性区的分布,对反压回填措施的合理性及有效性进行评估,并根据塑性区的分布指出施工注意事项。
At present the engineering analogy method is mainly adopted in design of tunnels,i. e.corresponding support parameters are selected according to the grades of wall rock,however,for some special sections,special argumentation and design are required. With the shallow-embedded biased section at the inlet of Yanggang No. 1 Tunnel as project background,this paper calculates the safety coefficient and distribution of plastic zones of the tunnel in the cases that any measure is not adopted and after back pressure backfill is adopted through the strength deduction method,evaluates rationality and effectiveness of back pressure backfilling measures,and points out precautions in construction according to distribution of plastic zones.
出处
《公路交通技术》
2016年第3期98-101,共4页
Technology of Highway and Transport
基金
重庆市应用开发项目(CSTC2013YYKFA30003)
重庆市科技攻关项目(CSTC2011AC6212)
关键词
浅埋偏压隧道
反压回填
强度折减法
安全系数
shallow-embedded biased tunnel
back pressure backfill
strength deduction method
safety coefficient
