摘要
根据软岩具有蠕变时效的特点,考虑岩体应力-应变全过程曲线,基于鲍格斯(Burgers)蠕变力学模型,推导出了考虑蠕变效应及初始地应力的隧道抗力系数计算公式。以沪昆高速铁路特大断面软岩隧道——明山隧道为工程依托,通过现场水压致裂试验获取隧道初始地应力以及室内岩石试验,获取围岩物理力学参数,代入该公式得到了明山隧道的围岩抗力系数。研究结果表明:该公式能够可靠的运用于具有蠕变效应的软岩隧道衬砌支护设计计算中;当围岩出现塑性流动变形时,围岩仍具有与衬砌共同承载的能力,这一研究结果对隧道衬砌设计具有十分重要的实际指导意义。
According to the characteristics of soft rock with creep age forming and considering the stress-strain entire process curve of rock mass, the computational formula of rock resistant coefficients is derived. This formula considered creep effect and initial ground stress, which was based on the Burgers creep mechanical model. With Shanghai-kunming high-speed railway tunnel in soft rock and large cross section which name is Mingshan tunnel as a support project. Through the hydraulic fracturing test for initial ground stress and indoor test for physical and me- chanical parameters of surrounding rock. Put that parameters into the formula and then got the rock resistant coeffi- cient of Mingshan tunnel. This findings indicated that the derived formula can reliable applied with lining supporting design calculation in soft rock tunnel with creep effect. Surrounding rock and lining were still common bearing capacity even through surrounding rock was in case of plastic flow deformation. So, the study has important practi- cal significance.
出处
《科学技术与工程》
北大核心
2014年第21期146-151,共6页
Science Technology and Engineering
基金
湖北省自然科学基金计划重点项目(2013CFA110)
中国地质大学(武汉)教学实验室开放基金项目(SKJ2013107)资助
关键词
特大断面隧道
围岩抗力系数
软岩
蠕变效应
初始地应力
large cross section tunnel rock resistant coefficient soft rock creep effect initial ground stress
