铁道建筑
鐵道建築
철도건축
RAILWAY ENGINEERING
2015年
4期
150-154,166
,共6页
简谐点荷载%浮置板轨道%隧道%饱和土体%动力响应
簡諧點荷載%浮置闆軌道%隧道%飽和土體%動力響應
간해점하재%부치판궤도%수도%포화토체%동력향응
Harmonic point load%Floating slab track%T unnel%Saturated soil%Dynamic response
假定隧道衬砌为Flügge薄壁圆柱壳,土体为饱和多孔介质,通过把荷载、动力响应沿环向模态分解,利用傅里叶积分变换求得非轴对称简谐点荷载作用下的隧道—饱和土体系统的动力响应。在此基础上,将浮置板、钢轨作为无限长的 Euler梁,考虑钢轨、浮置板、隧道—饱和土体系统的相互作用,求解了单层梁—隧道—饱和土体系统和双层梁—隧道—饱和土体系统在点荷载作用下的动力响应。研究结果表明:荷载频率对饱和土体中浮置板隧道的动力响应有较大影响;浮置板具有明显减振作用;在低频范围内,双层梁—隧道—饱和土体系统中上层的支承弹簧、钢轨的作用可以忽略。
假定隧道襯砌為Flügge薄壁圓柱殼,土體為飽和多孔介質,通過把荷載、動力響應沿環嚮模態分解,利用傅裏葉積分變換求得非軸對稱簡諧點荷載作用下的隧道—飽和土體繫統的動力響應。在此基礎上,將浮置闆、鋼軌作為無限長的 Euler樑,攷慮鋼軌、浮置闆、隧道—飽和土體繫統的相互作用,求解瞭單層樑—隧道—飽和土體繫統和雙層樑—隧道—飽和土體繫統在點荷載作用下的動力響應。研究結果錶明:荷載頻率對飽和土體中浮置闆隧道的動力響應有較大影響;浮置闆具有明顯減振作用;在低頻範圍內,雙層樑—隧道—飽和土體繫統中上層的支承彈簧、鋼軌的作用可以忽略。
가정수도츤체위Flügge박벽원주각,토체위포화다공개질,통과파하재、동력향응연배향모태분해,이용부리협적분변환구득비축대칭간해점하재작용하적수도—포화토체계통적동력향응。재차기출상,장부치판、강궤작위무한장적 Euler량,고필강궤、부치판、수도—포화토체계통적상호작용,구해료단층량—수도—포화토체계통화쌍층량—수도—포화토체계통재점하재작용하적동력향응。연구결과표명:하재빈솔대포화토체중부치판수도적동력향응유교대영향;부치판구유명현감진작용;재저빈범위내,쌍층량—수도—포화토체계통중상층적지승탄황、강궤적작용가이홀략。
Assuming the tunnel liner as Flügge thin cylindrical shell and the soil as saturated porous medium,the dynamic response of the tunnel-saturated soil system under non-axisymmetrical harmonic point load is calculated by decomposing the load and dynamic response along ring modes circumferentially and using Fourier transformation. O n this base,the dynamic response of single beam-tunnel-saturated soil system and double beam-tunnel-saturated soil system under point load is calculated by taking the f loating slab and rail as infinite long Euler beam and considering the interaction among the rail,slab,tunnel-saturated soil system. The research results showed that the load frequency has a great effect on the dynamic response of floating slab tunnel in saturated soil,the floating slab has obvious damping effect,the influence of upper spring and rail in double beam-tunnel-saturated soil system can be ignored in the low frequency range.