为了研究模块面板式土工格栅加筋土挡墙在高速铁路列车荷载作用下的动力响应规律，分析其作用机理，结合室内模型试验进行了包括加筋土挡墙墙面变形、墙体加速度、动土压力、残余土压力及土工格栅拉伸应变等分布规律的研究。结果表明：墙面累积水平位移沿墙高呈单峰值分布，最大值位置靠近墙顶；挡墙内竖向加速度受频率影响较大，8 Hz时加速度出现大幅增长，加筋体内加速度沿墙高出现衰减；动土压力主要受荷载幅值及加载次数的影响，在加筋体内沿墙高逐渐衰减，垂直动土压力的衰减速率逐渐增加，水平动土压力的衰减速率逐渐减小；随加载次数的增加，残余土压力逐渐增大，沿墙高墙体中部的残余土压力稍大；筋材累积应变随加载次数的增加略微减小，沿筋长呈单峰值分布，峰值位置距墙脚水平距离从高到低逐渐减小。
Abstract
In order to research the behaviors of geogrids reinforced soil retaining wall with concrete-block panel under the traffic loads of high speed railway, and analyze the mechanism. A series of researches, including the deformation of wall face, the accelerated velocity, the dynamic soil pressure, the residual soil pressure and the tension strain of geogrids, have been done through the model test in laboratory. Test results showed that, the cumulative lateral displacement of wall face performed a distribution of single-peak, and the position of max-value was close to the top of wall. The vertical accelerated velocity was mainly impacted by load frequency and increased largely when the frequency turned to 8 Hz, and it was attenuated in reinforcement body. The dynamic soil pressure was mainly impacted by load amplitude and load cycle number and performed the trend of attenuation down the wall height, the attenuation rate of vertical dynamic soil pressure gradually increased and that of horizontal dynamic soil pressure gradually decreased. With the increase of load cycle number the residual soil pressure increased gradually, and it was a little bigger in the middle portion along the wall height. The cumulative strain of the geogrid decreased slightly with the increase of load cycle number, and performed the distribution of single-peak along the geogrid length. The horizontal distance from the position of peak to the wall foot gradually decreased down the wall height.
关键词
模块面板 /
土工格栅 /
加筋土挡墙 /
动力荷载 /
模型试验
{{custom_keyword}} /
Key words
concrete-block panel /
geogrids /
reinforced soil retaining wall /
dynamic load /
model test
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] Liu H B, Yang G Q, Ling H I. Seismic response of multi-tiered reinforced soil retaining walls[J]. Soil Dynamics and Earthquake Engineering, 2014, 61-62: 1-12.
[2] Gobel C H, Weisemann U C. Effectiveness of a reinforcing geogrid in a railway subbase under dynamic loads[J]. Geotextiles and Geomembranes, 1994, 13: 91-99.
[3] Maher M H, Woods R D. Dynamic response of sand reinforced with randomly distributed fibers[J]. Journal of Geotechnical Engineering, 1990, 116(7): 1116-1131.
[4] 杨果林，李海深，王永和. 加筋土挡墙动力特性模型试验与动力分析[J]. 土木工程学报，2003，36(6)：105-110.
YANG Guo-lin, LI Hai-shen, WANG Yong-he. Model test on reinforced earth retaining wall under repeated load[J]. CHINA CIVIL ENGINEERING JOURNAL, 2003, 36(6): 105-110.
[5] 杨果林，肖宏彬，王永和. 加筋土挡墙动变形特性试验与疲劳损伤分析[J]. 振动工程学报，2002，15(2)：173-177.
YANG Guo-lin, XIAO Hong-bin, WANG Yong-he. Experiment dynamic behavior and analysis of fatigue damnify of reinforced earth wall[J]. Journal of Vibration Engineering, 2002, 15(2): 173-177.
[6] 杨果林，王永和. 加筋土挡墙在重复荷载作用下的模型试验与动态响应分析[J]. 岩石力学与工程学报，2002，21(10)：1541-1546.
YANG Guo-lin, WANG Yong-he. Model testing and dynamic respond analysis on reinforced earth wall under repeated load[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(10): 1541-1546.
[7] 杨果林，王永和. 土工合成材料在加—卸循环荷载作用下的应力—应变特性研究[J]. 铁道学报，2002，24(3)：74-77.
YANG Guo-lin, WANG Yong-he. Study on stress-strain relationship of geosynthetics under cyclic loaded-unloaded[J]. JOURNAL OF THE CHINA RAILWAY SOCIETY, 2002, 24(3): 74-77.
[8] 杨果林，林宇亮，李 昀. 新型加筋土挡墙动变形特性试验研究[J]. 振动与冲击，2010，29(1)：223-227.
YANG Guo-lin, LIN Yu-liang, LI Yun. Test study on dynamic deformation behavior of new reinforced earth retaining walls[J]. JOURNAL OF VIBRATION AND SHOCK, 2010, 29(1): 223-227.
[9] 李海深，杨果林，邹银生. 加筋土挡土墙动力特性分析[J]. 中国公路学报，2004，17(2)：28-31.
LI Hai-shen, YANG Guo-lin, ZOU Yin-sheng. Analysis of dynamic character of reinforced earth retaining wall[J]. China Journal of Highway and Transport, 2004, 17(2): 28-31.
[10] 李 昀. 格宾加筋挡土墙动力特性试验研究及数值分析[D]. 长沙：中南大学，2010.
LI Yun. Test study and numerical analysis on dynamic characteristics of gabion reinforced soil retaining walls[D]. Changsha: CENTRAL SOUTH UNIVERSITY, 2010.
[11] 王 贺，杨广庆，吴连海，等. 墙顶荷载对加筋土挡墙工作特性影响的试验研究[J]. 岩石力学与工程学报，2014，33(12)：2573-2581.
WANG He, YANG Guang-qing, WU Lian-hai, et al. Experimental study of geogrids reinforced retaining wall under overhead loading[J]. CHINESE JOURNAL OF ROCK MECHANICS AND ENGINEERING, 2014, 33(12)：2573-2581.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
PDF(4673 KB)
