列车振动荷载对柴达木盆地雅丹地貌稳定性的影响
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摘要
基于青海省地方铁路鱼卡至一里坪线路经过的雅丹地貌密集分布区现场调查和地质勘探,以室内物理力学试验结果为基础,利用数值软件ABAQUS对区域内典型雅丹模型进行稳定性计算分析。选取典型形态的雅丹地貌进行天然状态下的静力分析,对该区内雅丹地貌的天然稳定性做出评价。进而根据列车通过场地振动测试结果,对列车振动荷载作用下不同边坡角度雅丹的动力响应特征进行了计算,揭示了列车振动引起的雅丹失稳破坏机制。研究结果表明:天然状态下不同施工边坡角度对雅丹地貌自身的稳定性影响很小,可以忽略不计;列车荷载振动作用下对雅丹地貌自身的稳定性影响显著增强,其总位移、Mises应力值和剪应力S12值均显著增大,且随着列车运行距离的增大,雅丹的峰值加速度急剧减小。随着边坡角度的增大,加速度的放大作用愈加明显,且坡脚到坡顶的PGA呈明显放大趋势。最后给出了该线路在列车振动荷载作用下对其周围雅丹地貌稳定性影响显著的距离和合理的路基边坡角度范围。
Site investigation and geological exploration of Yardang landform intensive area are carried out,where local railway of Yuqia to Yiliping in Qinghai Province passes through.Based on physical and mechanical test results,a stability analysis of typical Yardang landform is performed by using ABAQUS,and its natural stability is evaluated by a static analysis.According to the results of the train vibration test,dynamic response characteristics,with different slope angle models,are calculated to reveal the failure mechanism of Yardand landform due to train vibration.The research results show that the effect of slope angle is very small for the stability of Yardang landform in natural state.Under train vibration loading,the total displacement and stresses of the slope model are significantly increased;with the increase of the train running distance,the peak acceleration of the Yardang model decreases sharply.As slope angle increases,the acceleration of the slope model is gradually amplified from slope bottom to top.At last,the distance range which has significant influences on the stability of Yardang landform around the line under train vibration loading is put forward,and reasonable slope angle of roadbed is also given.
Site investigation and geological exploration of Yardang landform intensive area are carried out,where local railway of Yuqia to Yiliping in Qinghai Province passes through.Based on physical and mechanical test results,a stability analysis of typical Yardang landform is performed by using ABAQUS,and its natural stability is evaluated by a static analysis.According to the results of the train vibration test,dynamic response characteristics,with different slope angle models,are calculated to reveal the failure mechanism of Yardand landform due to train vibration.The research results show that the effect of slope angle is very small for the stability of Yardang landform in natural state.Under train vibration loading,the total displacement and stresses of the slope model are significantly increased;with the increase of the train running distance,the peak acceleration of the Yardang model decreases sharply.As slope angle increases,the acceleration of the slope model is gradually amplified from slope bottom to top.At last,the distance range which has significant influences on the stability of Yardang landform around the line under train vibration loading is put forward,and reasonable slope angle of roadbed is also given.
引文
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[2]高平利,赖文宏,赵学静.西北铁路建设项目对生态环境影响的预测及评价方法探讨[J].环境科学,1998(增1):35-37.Gao P L,Lai W H,Zhao X J.Research of prediction and evaluation methods of ecological environmental impact about Northwest railway construction project[J].Environmental Science,1998(Sup 1):35-37.(in Chinese)
[3]吴志坚,陈拓,马巍.重复列车荷载作用下多年冻土路基长期变形分析[J].上海交通大学学报,2015,49(7):929-934.Wu Zh J,Chen T,Ma W.Analysis of long-term deformation of railway embankment at repeated train load in permafrost regions[J].Journal of Shanghai Jiaotong University,2015,49(7):929-934.(in Chinese)
[4]吴志坚,陈拓,马巍.青藏铁路多年冻土区机车荷载传递特性分析[J].岩土工程学报,2013,35(增1):9-13.Wu Zh J,Chen T,Ma W.Characteristics of load transmisson of train in permafrost regions along Qinghai-Tibet railroad[J].Chinese Journal of Geotechnical Engineering,2013,35(Sup 1):9-13.(in Chinese)
[5]朱占元.青藏铁路列车行驶多年冻土场地路基振动反应与振陷预测[D].哈尔滨:哈尔滨工业大学,2009.Zhu Zh Y.Train-induced vibration response and subsidence prediction of permafrost subgrade along Qinghai-Tibet Railway[D].Harbin:Harbin Institute of Technology,2009.(in Chinese)
[6]孔祥兵,赵淑萍,穆彦虎,等.列车荷载作用下冻土路基中的动应力计算研究[J].冰川冻土,2013,35(6):1 490-1 498.Kong X B,Zhao Sh P,Mu Y H,et al.Research on the calculation of dynamic stress of embankment in permafrost regions under train load[J].Journal of Glacioloy and Geocryology,2013,35(6):1 490-1 498.(in Chinese)
[7]刘刚,罗强,张良,等.列车荷载作用下无砟轨道路基动应力特性分析[J].铁道学报,2013,35(9):86-93.Liu G,Luo Q,Zhang L,et al.Analysis on the dynamic stress characteristics of the unballsted track subgrade under train loading[J].Journal of the China Railway Society,2013,35(9):86-93.(in Chinese)
[8]王常晶.列车移动荷载作用下地基的动应力及饱和软粘土特性研究[D].杭州:浙江大学,2006.Wang Ch J.Study on the dynamic stress in ground induced by train moving load and cyclic properties of soft saturated clay[D].Hangzhou:Zhejiang University,2006.(in Chinese)
[9]陈豫津,吴志坚,王平,等.柴达木盆地雅丹地区场地特征及铁路路基施工影响[J].防灾减灾工程学报,2016,36(2):309-314.Chen Y J,Wu Zh J,Wang P,et al.The site characteristics of Yadan Area and influence of railway roadbed construction in Qaidam Basin[J].Journal of Disaster Prevention and Mitigation Engineering,2016,36(2):309-314.(in Chinese)
[10]陈豫津.铁路施工对雅丹动力稳定性影响研究[D].兰州:中国地震局兰州地震研究所,2015.Chen Y J.Research on the dynamic stability of Yardang impacted by the construction of railway[D].Lanzhou:Lanzhou Institute of Seismology,2015.(in Chinese)
[11]夏训诚.中国罗布泊[M].北京:科学出版社,2007:1-10.Xia X Ch.Lop Nur region of China[M].Beijing:Science Press,2007:1-10.(in Chinese)
[12]吴正,王为.闽粤沿海老红砂多期沉积地层的发现及其意义[J].中国沙漠,2001,21(4):328-322.Wu Zh,Wang W.Finding and its significance of“old red sand”strata with multiple depositional stages on the coasts of Fujian and Guangdong[J].Journal of Desert Research,2001,21(4):328-322.(in Chinese)
[13]杨更.新疆雅丹地貌分布特征浅析[J].四川地质学报,2009,29(增2):286-290.Yang G.On distribution of the Yardang in Xinjiang[J].Sichuan Journal of Geology,2009,29(Sup2):286-290.(in Chinese)
[14]中国地震动参数区划图:GB18306-2011[S].北京:中华人民共和国国家标准化管理委员会,2011.Seismic ground motion parameters zonation map of China:GB18306-2011[S].Beijing:Standardization Administration of the People's Republic of China,2011.(in Chinese)