土工袋袋内土体强度与剪胀特性研究

Study on Strength and Dilatancy Characteristics of Soils Wrapped by Soilbags

为分析土工袋袋内土体强度与剪胀特性,将土工袋看作一种加筋土,尝试采用常规加筋土"等效围压理论"解释土工袋加固原理,在此基础上研究编织袋张力对袋内土体强度和剪胀特性的影响,并通过离散单元法建立了土工袋双轴数值模型对理论结果进行验证。结果表明,编织袋张力提高了袋内土体强度,其强度提高值在平均应力与剪应力平面表示为一附加截距;经编织袋加固后的土体剪缩现象更为明显。

In order to analyze the strength and dilatancy characteristics of soil in soilbags,soilbags are regarded as a kind of reinforced soil,and the reinforcement mechanism of geotextile bags is explained by the conventional equivalent confining pressure theory.On this basis,the impact of woven bag tension on the strength and dilatancy characteristics of soil in bags is studied.The biaxial numerical model of soil bag is established by discrete element method to verify the theoretical results.The results show that the tension of woven bag improves the strength of soil in the bag,and the strength improvement value is expressed as an additional intercept in the plane of average stress and shear stress.The shear shrinkage of soil strengthened by woven bags is more obvious.