墙顶荷载对加筋土挡墙工作特性影响的试验研究

发布时间：2018-01-13 08:21

本文关键词：墙顶荷载对加筋土挡墙工作特性影响的试验研究　出处：《岩石力学与工程学报》2014年12期 　论文类型：期刊论文

【摘要】：为了研究返包式土工格栅加筋土挡墙在墙顶荷载作用下的受力和变形状态,分析其作用机制,通过室内模型试验,进行包括加筋土墙体垂直和水平土压力、应力扩散角、侧土压力系数、墙面水平变形和竖向沉降及土工格栅拉伸应变等分布规律的研究。试验结果表明:加筋土挡墙内垂直土压力沿筋材长度方向呈非线性分布,最大值位置从加载前位于筋材中部附近逐渐移动到加载点下;靠近墙面位置侧土压力沿墙高逐渐从加载前与自重应力线性相关变化为加载后从高到低逐渐减小的分布规律,其值小于主动土压力;实测应力扩散角较非加筋土体大,稳定的应力扩散角约为50°;侧土压力系数与荷载大小成正比,其沿墙高分布规律与水平土压力相似;墙面累积水平位移沿墙高呈"S"形曲线分布,最大值位于中下部;筋材应变沿其长度方向呈单峰值和双峰值的分布,峰值出现位置距墙脚的水平距离从高到低逐渐减小。
[Abstract]:In order to study the wrapped type of geogrid reinforced soil retaining wall at the top of the wall under load, stress and deformation analysis of the mechanism, through the indoor model test, including vertical and horizontal earth pressure of the reinforced soil wall, stress diffusion angle, lateral earth pressure coefficient, horizontal deformation and vertical settlement of the wall and geogrid tensile strain distribution. Experimental results show that the reinforced soil retaining wall in the vertical soil pressure distribution along the reinforcement length direction, the position of the maximum load from before the reinforcement is located near the central gradually moved to the loading point near the position of the side wall; earth pressure along wall height gradually from before loading and the weight distribution of linear load force changes from high to low is gradually reduced, its value is less than the active earth pressure; the measured stress diffusion angle than the non reinforced soil, stability of the stress diffusion angle of about 50 degrees; lateral earth pressure With the load coefficient is proportional to the height of the wall and the distribution of horizontal earth pressure; wall cumulative horizontal displacement along the wall was "S" shaped curve, the maximum value is located in the lower part; the reinforcement strain along the length direction of a single peak distribution and value in Shuangfeng, the peak position from the foundation level the distance decreases gradually from high to low.

【作者单位】：北京交通大学土木建筑工程学院;石家庄铁道大学土木工程学院;铁道第三勘察设计院集团有限公司;华中科技大学土木工程与力学学院;
【基金】：国家自然科学基金资助项目(51178280,51378322) 河北省高等学校创新团队领军人才培育计划资助项目(LJRC023)
【分类号】：TU476
【正文快照】： 1引言加筋土挡墙具有减小沉降,提高强度,节约占地,施工方便,造价低廉,外形美观等优点,成为国内外学者研究的热点之一。国内外学者对加筋土挡墙的作用机制进行了相关研究:S.D.Chandra和E.E.Khaled[1]对加筋土挡墙拉筋轴向应力、应变大小及规律进行了理论研究和现场试验;高江平

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