铁道建筑
鐵道建築
철도건축
RAILWAY ENGINEERING
2015年
4期
44-49
,共6页
铁路隧道%重载列车%隧道结构%容许应力%疲劳分析
鐵路隧道%重載列車%隧道結構%容許應力%疲勞分析
철로수도%중재열차%수도결구%용허응력%피로분석
Railway tunnel%Heavy haul train%T unnel structure%Allowable stress%Fatigue analysis
采用无损检测及现场钻孔法对一既有重载隧道基底进行了探测，依据探测结果分析了隧底吊空对基底结构受力的影响。同时，利用ANSYS建立围岩—隧道结构—轨道结构三维动力分析模型，依据现场取样试验并结合实车动态试验结果，分析了30 t轴重重载列车通过隧道时基底吊空对基底结构受力的影响。分析结果表明，在Ⅴ级围岩条件下，当隧底混凝土厚度1.0～1.2 m时，轻重车线同时吊空且纵向吊空超过3.2 m、重车线吊空且纵向吊空超过5.5 m、重车线半幅吊空且纵向吊空超过8.0 m后，隧底最大主应力均超过其容许应力。疲劳分析结果表明，当基底仰拱沿纵向吊空从2.5 m增加到4.8 m时，其疲劳寿命降低最为明显；从4.8 m增加至8.0 m后，其疲劳寿命降低速率逐渐减弱；超过8.0 m后，其疲劳寿命基本趋于稳定且不足1年。因此，对于隧底出现的吊空病害应该及时加固处理，以保证列车安全。
採用無損檢測及現場鑽孔法對一既有重載隧道基底進行瞭探測，依據探測結果分析瞭隧底弔空對基底結構受力的影響。同時，利用ANSYS建立圍巖—隧道結構—軌道結構三維動力分析模型，依據現場取樣試驗併結閤實車動態試驗結果，分析瞭30 t軸重重載列車通過隧道時基底弔空對基底結構受力的影響。分析結果錶明，在Ⅴ級圍巖條件下，噹隧底混凝土厚度1.0～1.2 m時，輕重車線同時弔空且縱嚮弔空超過3.2 m、重車線弔空且縱嚮弔空超過5.5 m、重車線半幅弔空且縱嚮弔空超過8.0 m後，隧底最大主應力均超過其容許應力。疲勞分析結果錶明，噹基底仰拱沿縱嚮弔空從2.5 m增加到4.8 m時，其疲勞壽命降低最為明顯；從4.8 m增加至8.0 m後，其疲勞壽命降低速率逐漸減弱；超過8.0 m後，其疲勞壽命基本趨于穩定且不足1年。因此，對于隧底齣現的弔空病害應該及時加固處理，以保證列車安全。
채용무손검측급현장찬공법대일기유중재수도기저진행료탐측，의거탐측결과분석료수저조공대기저결구수력적영향。동시，이용ANSYS건립위암—수도결구—궤도결구삼유동력분석모형，의거현장취양시험병결합실차동태시험결과，분석료30 t축중중재열차통과수도시기저조공대기저결구수력적영향。분석결과표명，재Ⅴ급위암조건하，당수저혼응토후도1.0～1.2 m시，경중차선동시조공차종향조공초과3.2 m、중차선조공차종향조공초과5.5 m、중차선반폭조공차종향조공초과8.0 m후，수저최대주응력균초과기용허응력。피로분석결과표명，당기저앙공연종향조공종2.5 m증가도4.8 m시，기피로수명강저최위명현；종4.8 m증가지8.0 m후，기피로수명강저속솔축점감약；초과8.0 m후，기피로수명기본추우은정차불족1년。인차，대우수저출현적조공병해응해급시가고처리，이보증열차안전。
T he existing overloaded tunnel basement was detected by nondestructive testing and field drilling method and the effect of tunnel bottom hanging on basement structure force was analyzed according to the detecting results. Combining with the field sampling test and real vehicle dynamic experiments,the influence of tunnel bottom hanging on basement structure force when heavy haul train passing through the tunnel with 30 t axle load is analyzed by establishing three-dimensional dynamic analysis model of surrounding rock-tunnel structure-track structure with ANSYS. T he analysis results showed that both light and heavy vehicle line hang together and vertical hanging length is over 3. 2 m ,the heavy vehicle line hangs and the vertical hanging length is over 5. 5 m in the V surrounding rock conditions when the concrete thickness of tunnel bottom is in 1. 0 ~1. 2 m,the maximum principal force of tunnel bottom is 0. 5 M Pa more than the allowable stress when half of heavy vehicle line hangs and the vertical hanging length exceeds 8. 0 m. The results of fatigue analysis showed that fatigue life of basement inverted arch decreases obviously w hen longitudinal hanging length of inverted arch is from 2. 5 m to 4. 8 m ,the fatigue life and rate gradually decreases w hen longitudinal hanging length is from 4. 8 m to 8. 0 m ,fatigue life tends to be stable and the service life is less than 1 years when longitudinal hanging length is over 8. 0 m,which means tunnel hanging diseases should be reinforced on time in order to ensure the safe train operation.
