摘要
以通透肋式拱梁隧道这一新型洞室结构为对象,对其赋存地质环境条件和结构受力特征进行分析,明确该类型的半明半暗隧道结构应以极限状态下围岩破坏所引起的松弛压力为设计荷载标准的理念;通过对隧道围岩破坏形态和范围的数值模拟研究,弄清其基本破坏模式为:拱顶山坡岩体沿通过拱脚的一斜面形成楔体滑移,滑动破坏面与水平面的夹角即破裂角的大小决定围岩破坏的范围;以此为基础,结合理论分析推导建立通透肋梁拱梁隧道结构荷载设计计算模型,并与实际监测数据和施工工况数值模拟结果进行对比验证分析;分析结果表明,采用该模型计算的内力分布较好地反映隧道结构内力的变化规律,且具有可靠的安全裕,为同类型半明半暗隧道结构设计以及长期稳定性评价提供一种实用有效的分析方法。
The permeable tunnel with ribbed arch beam, which is a new type of tunnel structure, is analyzed. The geological environmental conditions and structural characteristics of this tunnel are expounded; and the concept of the design load standard for which the relaxation of the pressure caused by the surrounding rock failure in the limit state for this kind of non-symmetric half-dark tunnel structure is presented. By the numerical simulation study of the pattern and scope of tunnel surrounding rock failure, the basic failure modes of this tunnel can be concluded as which the vault slope rock slip along a ramp through the arch of the foot to form a wedge, and the size of the angle between the sliding failure surface and the horizontal plane determine the range of surrounding rock failure. On this basis, the structural load design and calculation model of the permeability tunnel with ribbed arch beam is established with theoretical analysis of the derivation, and compared and analyzed with the actual monitoring data and the numerical simulation results of construction conditions. The results show that the calculated internal forces distribution of this model can better reflects the variation of the internal force of tunnel structure, have a reliable safety margin, so as to provide a practical and effective design calculation method for the same type of half-dark tunnel structure section design and evaluation of long-term stability.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2013年第12期2489-2496,共8页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
傍山隧道
通透式结构
结构荷载
围岩破坏模式
设计计算模型
tunnelling engineering： tunnel adjacent to mountain： permeable structure： structural load： surroundingrock failure mode： design and calculation model
