桩板结构路基动力模型试验研究
|
摘要
桩板结构路基是高速铁路无碴轨道的一种新的路基结构形式,基于Bockinghamπ定理,采用量纲分析方法,确定了桩板结构路基模型的动力相似常数,通过室内大比例动态模型试验研究,分析了在循环加载的条件下浸水前、后桩板结构路基的动态力学特性。试验结果表明,路基动应力沿深度逐渐衰减,激振频率对动应力的影响不太明显;路基边坡浸水后,在相同加载频率下,动应力比浸水前略有增大;桩基加深了路基的动力影响范围,改善了路基土体部分的受力状态;桩底持力层受动力影响较大,是动力设计的关键环节之一。
The pile-plank embankment is a kind of new-type of ballastless truck in high-speed railway.Based on the theorem of Bockingham π,the dimensional analysis method is applied,and the dynamic model similitude constant of pile-plank embankment is determined.Dynamic characteristics of pile-plank embankment before and after soaking in water are analyzed by the large scale model test under dynamic loading.The test results indicate that dynamic stress of the soil decreases with the increase of vertical depth,and it is less affected by loading frequency.After the roadbed side-ascent soaking in water,at the same loading frequency,dynamic stress is slightly increased compared to embankment before soaking in water.Pile structure expands the depth of the dynamic response of roadbed and improves the stress of the roadbed soil.Bearing stratum at pile-bottom is greatly affected by dynamic loading;and it is one of the key of the dynamic design.
The pile-plank embankment is a kind of new-type of ballastless truck in high-speed railway.Based on the theorem of Bockingham π,the dimensional analysis method is applied,and the dynamic model similitude constant of pile-plank embankment is determined.Dynamic characteristics of pile-plank embankment before and after soaking in water are analyzed by the large scale model test under dynamic loading.The test results indicate that dynamic stress of the soil decreases with the increase of vertical depth,and it is less affected by loading frequency.After the roadbed side-ascent soaking in water,at the same loading frequency,dynamic stress is slightly increased compared to embankment before soaking in water.Pile structure expands the depth of the dynamic response of roadbed and improves the stress of the roadbed soil.Bearing stratum at pile-bottom is greatly affected by dynamic loading;and it is one of the key of the dynamic design.
引文
[1]蒋关鲁,詹永祥,魏永幸.无碴轨道桩板结构路基设计理论及计算理论的探讨[C]//铁路客运专线技术交流会论文集.武汉:铁道部发展计划司,2005:398-401.
[2]詹永祥,蒋关鲁,魏永幸.无碴轨道桩板结构路基的设计及计算[C]//第二届中国交通土建工程学术交流会论文集.成都:中国铁道学会,2006:723-729.
[3]日本鉄道総合技術研究所.基礎構造物——抗土圧構造物[M].日本:丸善株式会社出版,1997.
[4]吕西林,陈跃庆.结构-地基动力相互作用体系振动台模拟试验研究[J].地震工程与工程振动,2000,20(4):30-36.LüXi-lin,CHEN Yue-qing.Study of dynamic similitude theory of soil-structure interaction system[J].Earthquake Engineering and Engineering Vibration,2000,20(4):30-36.
[5]凌贤长,王臣,王成.液化场地桩-土-桥梁结构动力相互作用振动台试验模型相似设计方法[J].岩石力学与工程学报,2004,23(3):450-456.LING Xian-zhang,WANG Chen,WANG Cheng.Scale modeling method of shaking table test of dynamic interaction of pile-soil-bridge structure in ground of soil liquefaction[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(3):450-456.
[6]日本铁道综合技术研究所.省力軌道土構造物[M].日本:丸善株式会社出版,1999.
[7]中华人民共和国行业标准编写组.京沪高速铁路设计暂行规定[S].北京:中国铁道出版社,1998.
[8]蒋关鲁,刘先锋,张建文,等.高速铁路液化土地基加固的振动台试验研究[J].西南交通大学学报,2006,41(2):190-196.JIANG Guan-lu,LIU Xian-feng,ZHANG Jian-wen,et al.Shaking table test of composite foundation reinforcement of saturated silty ground for high speed railway[J].Journal of Southwest Jiaotong University,2006,41(2):190-196.
[2]詹永祥,蒋关鲁,魏永幸.无碴轨道桩板结构路基的设计及计算[C]//第二届中国交通土建工程学术交流会论文集.成都:中国铁道学会,2006:723-729.
[3]日本鉄道総合技術研究所.基礎構造物——抗土圧構造物[M].日本:丸善株式会社出版,1997.
[4]吕西林,陈跃庆.结构-地基动力相互作用体系振动台模拟试验研究[J].地震工程与工程振动,2000,20(4):30-36.LüXi-lin,CHEN Yue-qing.Study of dynamic similitude theory of soil-structure interaction system[J].Earthquake Engineering and Engineering Vibration,2000,20(4):30-36.
[5]凌贤长,王臣,王成.液化场地桩-土-桥梁结构动力相互作用振动台试验模型相似设计方法[J].岩石力学与工程学报,2004,23(3):450-456.LING Xian-zhang,WANG Chen,WANG Cheng.Scale modeling method of shaking table test of dynamic interaction of pile-soil-bridge structure in ground of soil liquefaction[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(3):450-456.
[6]日本铁道综合技术研究所.省力軌道土構造物[M].日本:丸善株式会社出版,1999.
[7]中华人民共和国行业标准编写组.京沪高速铁路设计暂行规定[S].北京:中国铁道出版社,1998.
[8]蒋关鲁,刘先锋,张建文,等.高速铁路液化土地基加固的振动台试验研究[J].西南交通大学学报,2006,41(2):190-196.JIANG Guan-lu,LIU Xian-feng,ZHANG Jian-wen,et al.Shaking table test of composite foundation reinforcement of saturated silty ground for high speed railway[J].Journal of Southwest Jiaotong University,2006,41(2):190-196.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心