Journal of Experiental Mechanicals

不同含水率下尾矿与土工格栅界面特性的试验研究

Experimental study of interface characteristics between geogrid and tailings with different water contents

Received:November 01, 2016 Revised:December 05, 2016

英文关键词:water content pseudo-cohesion pseudo friction angle pseudo-friction coefficient

基金项目:国家自然科学基金委员会-神华集团有限公司煤炭联合基金资助(51174268)

Author Name	Affiliation
XIE Bao-jin*	1.Institute of Civil Engineering and Transportation Liaoning Technical University, Fuxin 123000, China 2.The Third Engineering Co., LTD of China Railway Seventh Group, Xi'an 710032, China
ZHANG Xiang-dong	Institute of Civil Engineering and Transportation Liaoning Technical University, Fuxin 123000, China
DU Chang-bo	Institute of Civil Engineering and Transportation Liaoning Technical University, Fuxin 123000, China

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中文摘要:

含水率是影响尾矿加筋结构稳定性的重要因素。通过室内拉拔试验，对不同含水率(1.5%、 9.7%、 19.3%)下尾矿与土工格栅的界面特性进行了研究。结果表明，土工格栅的最大剪应力与法向应力呈线性相关，能够反映筋-尾矿界面参数似粘聚力和似摩擦角；似粘聚力随含水率增大先增大后减小，似摩擦角随含水率增大先减小后增大；在含水率增大过程中存在界限含水率，大小约为10%；在界限含水率下，似粘聚力达到最大值，似摩擦角达到最小值；似摩擦系数随法向应力增大呈非线性递减，可以二次抛物线拟合反映二者关系；在不同含水率条件下，似摩擦系数随含水率增大呈现先增大后减小规律，与对应界面参数似粘聚力的变化一致。上述试验分析成果对应用土工格栅进行尾矿坝加筋设计有一定的指导价值。

英文摘要:

Water content is an important factor to influence the stability of tailings reinforced structure. Through indoor drawing experiment, the interface characteristics between tailings and geogrid were studied under the condition of different water contents of tailings(1.5%, 9.7%, 19.3%). Results show that the maximum shear stress and normal stress of geogrid are linearly related, which can reflect that geogrid-tailings interface parameter is similar to pseudo-cohesion and pseudo-friction angle. With the increase of water content, pseudo-cohesion increases first and then decreases; and with the increase of water content, pseudo-friction angle also decreases first and then increases. During the process of water content increase, there is a water ratio limit of about 10%. Under the water ratio limit condition, pseudo-cohesion reaches the maximal value, pseudo-friction angle reaches the minimum value. Pseudo-friction coefficient decreases nonlinearly with the increase of normal stress, which shows that the relationship between them can be fitted by second-degree parabola. Under the condition of different water content, with the increase of water content, pseudo-friction coefficient increases first and then decreases, which is consistent with pseudo-cohesion variation of corresponding interface parameters. Above results have certain guiding value for tailings dam reinforcement design using geogrid.

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