Experimental study of reinforcement effect of soilbags on subgrade foundation and its influencing factors

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Oct.2024, Vol.47 No.10: 1396-1403

DOI: 10.3969/j.issn.1003-5060.2024.10.016

Authors

WANG Yanqiao $ ^{1} $, XU Kaiqi $ ^{1} $, LIU Kang $ ^{1} $, LU Yang $ ^{2} $

(1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China; 2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

Abstract and Keywords

Abstract: Based on the indoor physical scale model test, this paper studies the subgrade foundation loading failure test under the conditions of different layers, width and buried depth of the first layer of soilbags. By analyzing the distribution of cracks on the slope surface of the subgrade foundation and the crack rate, the load-settlement relationship curve, as well as the distribution law of the internal earth pressure in the subgrade foundation along the horizontal direction and the vertical direction, the paper studies the influence and law of the number of layers, width and buried depth of the first layer of soilbags on the reinforcement effect of the subgrade foundation. The results show that the soilbags have a significant impact on the distribution of the internal earth pressure of the foundation, and the greater the load, the more obvious the reinforcement effect of the soilbags; the more layers and the larger the width of soilbags, the better the effect of subgrade foundation reinforcement, but it is not the case under the condition of ensuring economic cost; the closer the top soilbag is to the loading plate, the more beneficial it is to control the settlement of the subgrade foundation, but not to control the development of cracks. Therefore, it is suggested that a certain buried depth of the first layer should be appropriately reserved in the actual project to facilitate the control of the development of cracks.

Keywords: subgrade foundation; soilbags; model test; bearing capacity; settlement; earth pressure

作者信息

王艳巧 $ ^{1} $，许凯淇 $ ^{1} $，刘康 $ ^{1} $，鲁洋 $ ^{2} $

(1. 合肥工业大学土木与水利工程学院, 安徽合肥 230009; 2. 河海大学水利水电学院, 江苏南京 210098)

摘要和关键词

摘要: 文章利用室内物理缩尺模型试验, 研究不同土工袋加固层数、加固宽度以及首层埋置深度条件下的路基基础加载破坏试验, 通过分析路基基础坡面裂缝率、荷载-沉降关系曲线以及路基基础内部土压力沿水平方向传递和竖直方向分布规律等, 研究土工袋加固层数、加固宽度及首层埋置深度对路基基础加固效果的影响及其规律。结果表明: 土工袋对基础内部土压力的分布有显著影响, 且荷载越大土工袋加固效果越明显; 土工袋加固层数及加固宽度越大, 路基基础加固效果越好, 但在保证经济成本的条件下并不是加固层数越多、加固宽度越大越好; 顶层土工袋距加载板越近越有利于控制路基基础沉降, 但不利于抑制裂缝的开展, 因此建议实际工程中适当保留一定的首层埋置深度, 以利于控制裂缝的开展。

关键词: 路基基础；土工袋；模型试验；承载力；沉降量；土压力

Funding

国家自然科学基金资助项目（51908175；52109123）

合肥工业大学学报(自然科学版)

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