【摘要】 为改变断层破碎带段隧道结构抗震"大震偏弱"的现状,提出了二衬防垮塌单层配筋抗震技术,并建立了断层破碎带段隧道结构二衬防垮塌抗震配筋准则。在汶川地震隧道震害资料分析的基础上,主要采用有限差分数值模拟技术,对罕遇烈度情况下错动断层与非错动断层2种情况进行研究,确定了断层破碎带段隧道结构二衬防垮塌抗震配筋等级及范围。研究结果表明:断层错动条件下,上盘距离断层2D(隧道跨度D)范围内和下盘距离断层1.5D范围内,二衬需双层配筋;上盘距断层2D~3D范围内和下盘距离断层1.5D~2.5D范围内,二衬需采用单层配筋。非错动断层条件下,设防烈度7度时,无需采用抗减震措施进行设防;设防烈度8度时,两侧距断层1D范围内需采用单层配筋;设防烈度9度时,两侧距断层约2.5D范围内需采用单层配筋。研究成果对断层破碎带段隧道结构抗减震技术的发展具有重要意义。更多还原

【Abstract】 In order to change the weak aseismic behavior of tunnel structure in fault rupture zone under large earthquakes,the aseismic reinforcement technology of second liner collapse control was proposed.And the aseismic reinforcement criterion of second liner collapse control of tunnel structure of fault rupture zone was established.This paper studies the fault movement and fault non-movement on the case of rare earthquake by using the finite difference numerical simulation technology based on the data analysis of tunnel damage of the earthquake in Wenchuan.And the aseismic reinforcement scope and level of second liner collapse control of tunnel structure of faultrupture zone were determined.The results show that second liner needs to apply double-layer reinforcement between 2Dsection from hanging fault and 1.5Dsection from footwall fault under the condition of fault movement.And second liner needs to apply monolayer reinforcement between 2Dto 3D section from hanging fault and 1.5D to 2.5D section from footwall fault.Under fault non-movement conditions,second liner needs not to apply anti-seismic and seismicrelieving measures at the earthquake intensity of 7degree;second liner needs to apply monolayer reinforcement between 1Dsection from side fault at the earthquake intensity of 8degree;second liner needs to apply double-layer reinforcement between 2.5D section from side fault at the earthquake intensity of 9degree.These results are significant to the anti-seismic and seismicrelieving technology development of tunnel structure in fault rupture zone.更多还原