35～40 t轴重重载铁路轻质混凝土路基结构的力学特性
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摘要
提出了适用于35～40 t轴重重载铁路轻质混凝土路基结构架构方案,采用将实尺模型试验、室内力学试验及理论分析相结合的方法验证其力学可行性,研究轻质混凝土路基结构的应力传递规律及受力变形关系。试验结果表明:湿密度800 kg/m3的轻质混凝土7,28 d抗压强度分别为1. 55,2. 63 MPa,满足重载铁路轻质混凝土路基结构的设计要求;轨下应力较为集中,两轨中间应力叠加,竖向应力随着扩散广度及深度增加逐渐降低,沿线路纵向竖向应力传递规律也类似。
The architecture scheme oflightweight concrete subgrade structure suitable for heavy haul railway with35 ～ 40 t axle load was put forward,the mechanical feasibility of the scheme was verif ied by a combination of means of full-scale model test,indoor mechanical test and theoretical analysis,and the stress transfer lawand stressdeformation relationship oflightweight concrete subgrade structure was studied.The results showthat the compressive strength oflightweight concrete with wet density of 800 kg/m3 is 1. 55 and 2. 63 MPa respectively for 7 days and 28 days,which could meet the design requirements oflightweight concrete subgrade structure for heavy haul railway,the stress under rail is concentrated and the stress between the two wheels is superimposed,vertical stress decreases gradually with the depth and breadth of diffusion,and the lawof vertical stress transmission along the railway line is similar.
The architecture scheme oflightweight concrete subgrade structure suitable for heavy haul railway with35 ～ 40 t axle load was put forward,the mechanical feasibility of the scheme was verif ied by a combination of means of full-scale model test,indoor mechanical test and theoretical analysis,and the stress transfer lawand stressdeformation relationship oflightweight concrete subgrade structure was studied.The results showthat the compressive strength oflightweight concrete with wet density of 800 kg/m3 is 1. 55 and 2. 63 MPa respectively for 7 days and 28 days,which could meet the design requirements oflightweight concrete subgrade structure for heavy haul railway,the stress under rail is concentrated and the stress between the two wheels is superimposed,vertical stress decreases gradually with the depth and breadth of diffusion,and the lawof vertical stress transmission along the railway line is similar.
引文
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[2]杨春风,庄灿,李洪亮,等.泡沫轻质土用于软基路基拓宽时应力应变分析[J].广西大学学报(自然科学版),2016,41(1):234-245.
[3]章洪俊,张海波,林叶儿.泡沫轻质土在桥梁台后地基处理中的应用[J].城市道桥与防洪,2015(2):96-99.
[4]冯炜,雷学通,王新岐.现浇泡沫轻质土力学性能的试验研究[J].城市道桥与防洪,2015(5):205-207.
[5]王立军,叶阳升,张千里,等.泡沫轻质土的浸水性能试验研究[J].铁道建筑,2017,57(1):103-106.
[6]陈忠平,王树林,邓江.气泡混合轻质填土新技术[M].北京:人民交通出版社,2004.
[7]张千里,李中国,陈锋,等.铁路路基轻质材料路用性能与控制参数研究[R].北京:中国铁道科学研究院,2016.
[8]王晴,丁纪楠,丁兆洋,等.地聚物基泡沫混凝土制备与性能研究[J].混凝土,2018(11):118-121,126.
[9]宋宏芳,刘晓贺,李佰林.季节性冻土区高速铁路新型防冻胀路基力学特性研究[J].铁道学报,2018,40(11):98-104.
[10]程佳.哈齐客专路基温度场及保温措施数值模拟分析[D].石家庄:石家庄铁道大学,2016.