红层泥岩及其改良填料路基动力响应试验研究
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摘要
基床作为路基结构的重要组成部分,其填料的质量对路基、轨道、列车的动力响应影响显著。在实际工程中,基床填料通常可根据设计规范取为A、B组填料,但考虑到经济因素、力学性能等,也可采用既有填料或改良的既有填料。为了研究红层泥岩,A、B组填料,石灰改良红层泥岩分别作为基床填料时对路基动力响应的影响,进行了不同基床填料的现场激振试验。通过对动应力、加速度及沉降等数据的对比分析,得到以下结论:红层泥岩作为基床填料时,动应力与路基沉降在加载激振次数内可满足设计要求;与红层泥岩相比,当基床填料为A、B组填料与石灰改良红层泥岩时,路基表面的动应力与加速度分布更加均匀,因而此时路基的整体承载性能更优越。除此之外,后两种填料时路基内部动应力与加速度的衰减相对前者更显著,并且路基的沉降变形更小,特别是为石灰改良红层泥岩时。
As an important part of the subgrade, the filling material quality of subgrade bed has a significant influence on the dynamic response of the subgrade, track, and train. In practical engineering, although filling material of group A, B can be directly used according to the design code in China, improved soils and even unimproved soils also may be used if the economic factors and mechanical properties are considered to meet the requirements. In order to study the influence of different filling materials, such as red mudstone, filling material of group A, B, and improved red mudstone, on dynamic response of subgrade, field vibration tests are carried out. According to the comparative analysis of the tested data, the following conclusions about dynamic stress, acceleration, and settlement have been obtained. When the red mudstone is used, the dynamic stress and settlement can meet the design requirements during the loading period. Compared with the responses when using red mudstone, the distributions of dynamic stress and acceleration along the cross-section of the subgrade surface are more uniform when filling material is group A, B and lime-modified red mudstone, so the overall bearing capacities of these subgrades are better at this time. Besides, the attenuations of the dynamic stress and acceleration along the depth of the subgrade are more obvious than that in the red mudstone; the settlement of the subgrade is smaller, especially when the improved red mudstone is used.
As an important part of the subgrade, the filling material quality of subgrade bed has a significant influence on the dynamic response of the subgrade, track, and train. In practical engineering, although filling material of group A, B can be directly used according to the design code in China, improved soils and even unimproved soils also may be used if the economic factors and mechanical properties are considered to meet the requirements. In order to study the influence of different filling materials, such as red mudstone, filling material of group A, B, and improved red mudstone, on dynamic response of subgrade, field vibration tests are carried out. According to the comparative analysis of the tested data, the following conclusions about dynamic stress, acceleration, and settlement have been obtained. When the red mudstone is used, the dynamic stress and settlement can meet the design requirements during the loading period. Compared with the responses when using red mudstone, the distributions of dynamic stress and acceleration along the cross-section of the subgrade surface are more uniform when filling material is group A, B and lime-modified red mudstone, so the overall bearing capacities of these subgrades are better at this time. Besides, the attenuations of the dynamic stress and acceleration along the depth of the subgrade are more obvious than that in the red mudstone; the settlement of the subgrade is smaller, especially when the improved red mudstone is used.
引文
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[14]蒋关鲁,房立凤,王智猛,等.红层泥岩路基填料动强度和累积变形特性试验研究[J].岩土工程学报,2010,32(1):124-129.JIANG Guan-lu,FANG Li-feng,WANG Zhi-meng,et al.Experimental study on dynamic strength and accumulated deformation characteristics of red-mudstone filling[J].Chinese Journal of Geotechnical Engineering,2010,32(1):124-129.
[2]和振兴,翟婉明.高速列车作用下板式轨道引起的地面振动[J].中国铁道科学,2007,28(2):7-11.HE Zhen-xing,ZHAI Wan-ming.Ground vibration generated by high-speed trains along slab tracks[J].China Railway Science,2007,28(2):7-11.
[3]王智猛,蒋关鲁,魏永幸,等.达成线红层泥岩路基循环加载试验研究[J].岩土工程学报,2008,30(12):1888-1893.WANG Zhi-meng,JIANG Guan-lu,WEI Yong-xing,et al.Experimental study on dynamic performance of red-mudstone subgrade under cyclic loading in DazhouChengdu line[J].Chinese Journal of Geotechnical Engineering,2008,30(12):1888-1893.
[4]孔纲强,孙广超,刘汉龙,等.不同激振频率下现浇X形桩桩-筏复合地基模型试验研究[J].岩土力学,2017,38(5):1379-1384.KONG Gang-qiang,SUN Guang-chao,LIU Han-long,et al.Experimental study of XCC pile-raft composite foundation under different excitation frequencies[J].Rock and Soil Mechanics,2017,38(5):1379-1384.
[5]韩文斌,王元汉.京沪高速铁路路基基床填料改良试验研究[J].岩石力学与工程学报,2001,20(增刊1):165-171.HAN Wen-bin,WANG Yuan-han.Testing study on modification of railway roadbed for Bejing-Shanghai High-speed railway[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(Supp.1):165-171.
[6]陈乐求,张家生,陈俊桦,等.水泥改良泥质板岩粗粒土的静动力特性试验[J].岩土力学,2017,38(7):1903-1910.CHEN LE-qiu,ZHANG Jia-sheng,CHEN Jun-hua,et al.Testing of static and dynamic strength properties of cement-improved argillaceous-slate coarse-grained soil[J].Rock and Soil Mechanics,2017,38(7):1903-1910.
[7]刘宝,苏谦,李婷,等.饱和多孔介质动力响应移动单元法分析[J].岩土力学,2017,38(7):2071-2079.LIU Bao,SU Qian,LI Ting,et al.Analysis of dynamic response of saturated porous media by moving element method[J].Rock and Soil Mechanics,2017,38(7):2071-2079.
[8]SHIH J Y,THOMPSON D J,ZERVOS A.The effect of boundary conditions,model size and damping models in the finite element modelling of a moving load on a track ground system[J].Soil Dynamics and Earthquake Engineering,2016,89:12-27.
[9]KAYNIA A M,MADSHUS C,ZACKRISSON P.Ground vibration from high-speed trains:Prediction and countermeasure[J].Journal of Geotechnical and Geoenvironmental Engineering,2000,126(6):531-537.
[10]梁波,蔡英.不平顺条件下高速铁路路基的动力分析[J].铁道学报,1999,21(2):84-88.LIANG Bo,CAI Ying.Dynamic analysis on subgrade of high speed railways in geometric irregular condition[J].Journal of the China Railway Society,1999,21(2):84-88.
[11]中国第三勘察设计院集团有限公司.TB 10621―2014高速铁路设计规范[S].北京:中国铁道出版社,2014.China Railway Third Survey and Design Institute Group Co.,Ltd.TB 10621―2014 Code for design high speed railway[S].Beijing:China Railway Publishing House,2014.
[12]杨永平,周顺华.合-宁客运专线膨胀土不同高度路堤动力特性分析[J].岩土力学,2008,29(5):1403-1406.YANG Yong-ping,ZHOU Shun-hua.Analysis of vibration character of expansive soil embankments with different heights of He-Ning High-speed Railway[J].Rock and Soil Mechanics,2008,29(5):1403-1406.
[13]庞巍,叶朝良,杨广庆,等.电石灰改良滨海地区盐渍土路基可行性研究[J].岩土力学,2009,30(4):1068-1072.PANG Wei,YE Chao-liang,YANG Guang-qing,et al.Study of feasibility of calium carbide dust improved inshore area saline soil for highway subgrade[J].Rock and Soil Mechanics,2009,30(4):1068-1072.
[14]蒋关鲁,房立凤,王智猛,等.红层泥岩路基填料动强度和累积变形特性试验研究[J].岩土工程学报,2010,32(1):124-129.JIANG Guan-lu,FANG Li-feng,WANG Zhi-meng,et al.Experimental study on dynamic strength and accumulated deformation characteristics of red-mudstone filling[J].Chinese Journal of Geotechnical Engineering,2010,32(1):124-129.