[1]赵俊明,刘松玉,石名磊,等.交通荷载作用下低路堤动力特性试验研究[J].东南大学学报(自然科学版),2007,37(5):921-925.[doi:10.3969/j.issn.1001-0505.2007.05.036]
　Zhao Junming,Liu Songyu,Shi Minglei,et al.Experimental study on dynamic response of low embankment under traffic load[J].Journal of Southeast University (Natural Science Edition),2007,37(5):921-925.[doi:10.3969/j.issn.1001-0505.2007.05.036]
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交通荷载作用下低路堤动力特性试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
37
期数:
2007年第5期
页码:
921-925
栏目:
土木工程
出版日期:
2007-09-20

文章信息/Info

Title:
Experimental study on dynamic response of low embankment under traffic load
作者:
赵俊明1; 2;  刘松玉1;  石名磊1;  张海军2
1 东南大学交通学院, 南京 210096; 2 江苏省交通科学研究院, 南京 210017
Author(s):
Zhao Junming1; 2;  Liu Songyu1;  Shi Minglei1;  Zhang Haijun2
1 School of Transportation, Southeast University, Nanjing 210096,China
2 Jiangsu Transportation Research Institute, Nanjing 210017, China
关键词:
低路堤;  交通荷载;  动应力;  振动响应;  动三轴试验;  循环应力比;  软土
Keywords:
low embankment;  traffic load;  dynamic stress;  vibration response;  dynamic triaxial test;  cyclic stress ratio;  soft clay
分类号:
TU411.8
DOI:
10.3969/j.issn.1001-0505.2007.05.036
摘要:
结合连盐高速低路堤,对路堤进行了动应力、振动响应等现场测试,分析了路基中附加动应力及振动位移的变化规律.并且通过应力控制的室内动三轴试验,采用一定的动应力频率、不同的循环应力比来模拟交通荷载,研究了在循环荷载作用下,连盐高速公路饱和软粘土的轴向累计应变、孔隙水压力和轴向周期应变软化的变化规律.实验结果表明:路堤中动应力和振动位移随行车速度和车重的增加而增加,随深度的增加而降低,有效影响深度达2.5 m; 原状土的临界循环应力比远大于重塑土,承受循环应力能力高于重塑土.因此,要加强浅层路基强度,同时要减少对底部下卧层软粘土的扰动.其结果可为在软土地基上设计和施工低路堤高速公路提供有益的参考.
Abstract:
The field tests of dynamic stress and vibration response were conducted at Lianyan expressway with low embankment. The additional dynamic stresses and vibration displacement in roadbed were analyzed. In addition, in laboratory tests using dynamic triaxial test machine with stress controlled, definite dynamic stress frequency and different cyclic stress ratio were adopted to simulate the traffic load, and the axial strain, pore water pressure and axial strain softening under cyclic load were studied. The results show that the dynamic stress and vibration displacement increase with the increase of traffic velocity and weight, and decrease as the depth increases, the effective influence depth being about 2.5 m. Critical cyclic stress ratio of undisturbed soil is bigger than disturbed one. Dynamic shear strain of undisturbed soil exceeds that of disturbed one. Therefore, the strength of shallow subgrade needs to be reinforced and the disturbance of the subsoil during construction needs to be reduced. The result is useful for designing and constructing expressway with low embankment on soft clay.

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备注/Memo

备注/Memo:
基金项目: 江苏省交通科学研究计划资助项目(04Y010).
作者简介: 赵俊明(1980—),男,博士生; 刘松玉(联系人),男,博士,教授,博士生导师,Liusy@seu.edu.cn.
更新日期/Last Update: 2007-09-20