摘要
为研究多雨丘陵地区铁路2级加筋格宾挡墙施工期的力学行为,开展现场试验,对结构变形、挡墙内土压力、筋材应变进行分析。结果表明:抗滑桩顶部、上下级墙面和非加筋区土体水平位移随时间逐渐增大,而后趋于稳定,上下级墙面和非加筋区土体水平位移沿墙高从下到上呈近似线性增大趋势,非加筋区土体水平位移比加筋区土体大;挡墙基底、下级墙顶和上级墙顶沉降随时间逐渐增大,而后趋于稳定,静置期间加筋土区域的压缩变形比非加筋土区域小,沿水平方向距墙面越远沉降越大;上下级墙底实测竖向土压力比理论计算土体自重小,而水平土压力的实测值与理论计算值相比,作用于上级墙面板的为上大下小,作用于下级墙面板的则大幅减小,作用于加筋土体背面(各层加筋材料末端连线形成的截面)的水平土压力在上级墙范围内接近静止土压力计算值,在下级墙范围内比静止土压力大幅减小;土工格栅最大应变为0.7%,实测潜在破裂面接近于采用美国联邦公路局对加筋土挡墙设计方法的预测,在雨季时结构变形和挡墙内土压力出现小幅增长,土工格栅应变则稍有减小。
To investigate the mechanical behavior of two-tier reinforced gabion retaining walls for railways in rainy hilly areas during construction,a field test was conducted to study the structural deformation,soil pressure in the wall,and reinforcement strain.Findings reveal that horizontal displacements at the anti-slide pile top,upper/lower-tier wall surfaces,and non-reinforced soil zone gradually increased and stabilized over time.Horizontal displacements of upper/lower-tier wall surfaces and non-reinforced soil zone showed approximate linear growth from bottom to top along the wall height,with non-reinforced soil zones exhibiting greater displacement than reinforced soil zone.Settlements at the wall base and the tops of lower-tier and upper-tier progressively increased then stabilized over time.Compression deformation in reinforced soil zone was smaller than that in non-reinforced soil zone during standing period,and settlement increased with horizontal distance from the wall face.Measured vertical soil pressures at the upper/lower-tier wall bases were lower than theoretical calculation values of soil self weight.For horizontal soil pressure,the measured horizontal soil pressure acting on upper-tier wall panel were greater at the top and smaller at the bottom compared to theoretical values,while those on the lower wall panel were significantly reduced.Horizontal soil pressure acting on the back of reinforced soil zone(the section connecting ends of all reinforced layers)was close to the theoretical static soil pressure in the upper-tier wall,but substantially lower in the lower-tier wall.In terms of geogrid strain and potential failure surface,the maximum geogrid strain was O.7%,and the measured potential failure surface was close to that predicted by the Federal Highway Administration(FHWA)design method for reinforced soil retaining wall.During rainy seasons,structural deformation and soil pressure showed slight increase,while the geogrid strain decreased slightly.
作者
周先才
徐健楠
杨广庆
周诗广
孟潇康
王贺
ZHOU Xiancai;XU Jiannan;YANG Guangqing;ZHOU Shiguang;MENG Xiaokang;WANG He(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;China Railway Society,Beijing 100844,China)
出处
《中国铁道科学》
北大核心
2025年第6期67-76,共10页
China Railway Science
基金
国家重点研发计划项目(2022YFE0104600)
国家自然科学基金资助项目(52079078)。
关键词
铁路
2级加筋格宾挡墙
抗滑桩
力学行为
现场试验
Railway
Two-tier reinforced gabion retaining wall
Anti-slide pile
Mechanical behavior
Field test
