【摘要】 本文通过考虑松动圈围岩强度降低、松动破裂形成的垫层效应以及地震波的绕流效应,提出使用松动圈折减系数R来计算隧道的地震响应。在衬砌结构随地层运动内力理论解基础上,以S波为例,推导了考虑松动圈减震作用的计算方法。运用有限差分软件FLAC3D中的动力模块对隧道松动圈减震问题进行了数值模拟,并与衬砌结构随地层运动内力理论解及建议的松动圈折减系数法进行对比。结果表明,在充分考虑松动圈存在的情况下,使用松动圈折减系数法计算出来的结果与数值模拟结果较为吻合(最大弯矩误差值为8.28%,最大剪力误差值为10.68%),较衬砌随地层运动理论解法更为精确(最大弯矩误差值为62.13%,最大剪力误差值为50.49%)。该方法计算思路和概念清晰,计算公式简洁明了,计算量较小,便于实际应用。更多还原

【Abstract】 The paper presents a calculation method of deep buried tunnel seismic response considering rock loosing zone cushioning effect.The basic train of thought is considering strength decrease of surrounding rock,cushion effect after rock loosing and fracture and wave transmit around the loosing zone.Reduction factor R is used to calculate the seismic response.Theoretical solution of lining structure uniform to surrounding rock movement is given,based on which,a calculation method considering rock loosing zone damping effect is deduced,taking S wave as an example.FLAC3D dynamic module is used to make numerical simulation of loosing zone damping effect.The results are compared with theoretical solution of lining structure uniform to surrounding rock movement and reduction factor method.Conclusions are: When loosing zone is fully taken into account,the result of reduction factor R method is coinciding with numerical simulation result(Maximum error value of bending moment is 8.28%,maximum error value of shear force is 10.68%),more accurate than theoretical solution of lining structure uniform to surrounding rock movement(Maximum error value of bending moment is 62.13%,maximum error value of shear force is 50.49%).The train of thought and concept of this method is clear,with concise formula and less calculation,and easy to practical application.更多还原