高速铁路浸水路基长期稳定性试验分析

陈尚勇; 孙红林

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铁道工程学报 ›› 2011, Vol. 28 ›› Issue (12) : 40-44.

路网研究

高速铁路浸水路基长期稳定性试验分析

陈尚勇,孙红林

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Experimental Analysis of Long － term Stability of Soaking Subgrade for High Speed Railway

CHEN Shang － yong，SUN Hong － lin

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文章历史 +

摘要

研究目的: 与一般路基相比，浸水路基在水流冲击、淘刷、侵蚀及水对路基填土的软化、水位升降等不利作用下，经受列车循环荷载的长期作用，其稳定性更易受到威胁。为此，开展了高速铁路无砟轨道路基浸水条件下的循环荷载动态试验，进行了路基动应力、弹性变形、塑性变形、动孔压、自振频率等测试分析，以评价浸水路基的长期稳定性，验证设计方案的可靠性、合理性。

研究结论: 按时速 350 km CRTS II 型板式无砟轨道浸水路基的受力边界条件，建立了动态试验系统。在试验 9 ～13 kPa 的动应力条件下，经过 550 万次的动载作用后，基床内动应力、动孔压、弹性变形处于比较稳定的状态，塑性变形为 0． 48 ～0． 56 mm。从扫频试验结果来看，路基的自振频率比列车动载作用频率大很多，不会产生共振现象; 振后路基的自振频率减小幅度很小，路基性能保持良好。试验设计采用的浸水路基防护、填筑方案是可行的，长期浸水条件下其性能稳定，能够满足无砟轨道对基床强度及变形的要求。

Abstract

Research purposes: Compared with general subgrade，the long － term stability of soaking subgrade would be threatened when it suffered flow impact，scour，erosion，water softening of the roadbed fill，adverse effects of water level change and cyclical loading by train． So a dynamic experiment system is built to study the behavior of soaking subgrade under cyclical loading by train for high speed railway． Then，some testing indexes containing subgrade dynamic stress， elastic deformation，plastic deformation，dynamic pore water pressure，the natural frequency and so on are analyzed． At last，the long － term stability of the soaking subgrade is evaluated and the reliability and reasonableness of the design scheme is verified．

Research conclusions: A dynamic test system is established according to the loading boundary conditions of soaking subgrade paved with CRTS II slab ballastless track for a top speed of 350 km / h． After 5． 5 million times dynamic loading of 9 ～ 13 kPa，the dynamic stress，the dynamic pore pressure and the elastic deformations of the roadbed are in stable states，and the plastic deformation is 0． 48 ～ 0． 56 mm． The results of the sweeping frequency test indicate that the resonance will not happen as the natural vibration frequency of the subgrade is more than train ＇s dynamic loading frequency and the subgrade keep good performance because the natural vibration frequency decreases less after the dynamic test． The design of the experiment about soaking subgrade protection and filling is feasible． The long － term soaking subgrade has stable performance and can meet the strength and deformation requirements of the roadbed with ballastless track．

导出引用

陈尚勇, 孙红林. 高速铁路浸水路基长期稳定性试验分析[J]. 铁道工程学报, 2011, 28(12): 40-44

CHEN Shang － yong, SUN Hong － lin. Experimental Analysis of Long － term Stability of Soaking Subgrade for High Speed Railway[J]. Journal of Railway Engineering Society, 2011, 28(12): 40-44

中图分类号： U213． 1

参考文献

［1］ TB 10621—2009，高速铁路设计规范( 试行) ［S］．

TB 10621—2009，Code for Design of High Speed Railway［S］．

［2］ TB 10001—2005，铁路路基设计规范［S］．

TB 10001—2005，Code for Design on Subgrade of Railway［S］．

［3］顾湘生．客运专线路基工程几个问题的讨论［J］．铁道工程学报，2005( 1) : 31 －38．

Gu Xiangsheng． Discussion on Some Issues in Construction of Subgrade of Passenger Dedicated Line ［J］． Journal of Railway Engineering Society，2005( 1) : 31 － 38．

［4］朱忠林，马伟斌，韩自力．新建铁路路基改良土动力学试验研究［J］．中国铁路，2007( 5) : 51 －53．

Zhu Zhonglin， Ma Weibin， Han Zili． Experimental Study on Dynamic Characteristics of Improved Soil in New Railway Subgrade［J］． Chinese Railway，2007( 5) : 51 － 53．

［5］朱忠林，马伟斌，史存林．合宁线试验段路堑基床地基动力特性试验研究［J］．铁道建筑，2007( 2) : 55 －58．

Zhu zhonglin， Maweibin， Shi Cunlin． Experimental Study on Dynamic Characteristics of Cutting Roadbed in He － Ning Railway Test Section ［J］． Railway Engneering，2007( 2) : 55 － 58．

［6］郑大为，王炳龙，周顺华，等．合宁快速客运专线膨胀土不同刚度路堤振动特性研究［J］．岩石力学与工程学报， 2006( S2) : 4204 － 4208．

Zheng Dawei， Wang Binglong， Zhou Shunhua etc． Study on Vibration Character of Expansive Soil Embankments with Different Rigidities Along Hefei － Nanjing Rapid Railway［J］． Chinese Journal of Rock Mechanics and Engineering，2006( S2) : 4204 － 4208．

［7］孙红林，李丹．京沪高速铁路路基工程主要技术标准研究［J］．铁道建筑，2009( 7) : 5 －10．

Sun Honglin， Li Dan． Mainly Technical Standard Research on The Beijing － Shanghai High － Speed Railway Subgrade Engineering［J］． Railway Engneering， 2009( 7) : 5 － 10．

［8］李丹．京沪高速铁路徐沪段路基填料利用方案研究［J］．高速铁路技术，2010( 1) : 54 －56．

Li Dan． One Plan of Utilizable Subgrade Filling in Xuzhou － Shanghai Section of Beijing － Shanghai High － Speed Railway． High － Speed Railway Technology［J］． 2010( 1) : 54 － 56．

［9］ A． Gomes Correia， Heinz Brandl． Geotechnics for Roads， Rail Tracks and Earth Structures ［M］． Netherlands: A． A． Balkema，2001．