基于间接加筋作用的加筋土强度降低原因分析  

Causal analysis on strength reduction of geo-fiber reinforced soil considering indirect reinforced effect

作　　者：雷胜友[1] 惠会清[2] LEI Shengyou;HUI Huiqing(School of Highway,Chang′an University,Xi′an 710064,China;School of Science,Chang′an University,Xi′an710064,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学理学院,陕西西安710064

出　　处：《人民长江》2022年第8期192-197,共6页Yangtze River

基　　金：国家自然科学基金项目(59479017);地质灾害防治与地质环境保护国家重点实验室开放基金项目(GZ2005-03);国家级大学生创新创业训练计划资助项目(S202010710008)。

摘　　要：为了进一步探索加筋土强度降低的原因,从间接加筋角度出发,通过考虑加筋的负面作用,得到了加筋作用影响范围内土体强度参数的劣化机理,由此推导出了拉断破坏和黏着破坏情形下的加筋土强度表达式,并对这两种强度表达式作了讨论分析。研究结果表明:①当加筋作用不足以弥补黏聚力与摩阻力的减少时,加筋土的强度会低于不加筋土的强度。②加筋土强度的降低程度与土-筋界面的渗透性、加筋材料在土中形成的夹层、加筋间距等有关。③在加筋土工程的设计中,应优化筋土比例,合理化加筋间距,改善土筋界面的透水性,使间接加筋作用发挥到最大,从而可以进一步提高加筋土的强度。In order to further explore the reasons of decrease in the strength of geo-fiber reinforced soil,starting from the perspective of indirect reinforcement and considering on the negative effects of reinforcement,we give the deterioration mechanism of the reinforced soil strength within the influential range of the reinforcement,thereby obtain the strength expressions of the reinforced soil under tensile failure and adhesive failure.And then a detailed discussion and analysis on the two strength expressions are carried out.The studies show that:①When the reinforcement effect is not enough to compensate for the decrease in cohesion and friction,the strength of the reinforced soil will be lower than that of the unreinforced soil.②The degree of decrease in the strength of reinforced soil is related to the permeability of the soil-reinforcement interface,the interlayer formed by the reinforced material in the soil,and the spacing of the geo-fiber.③In the design of reinforced soil engineering,the ratio of geo-fiber to soil should be optimized,the spacing between geo-fiber should be rationalized,and the water permeability of the soil-reinforced interface should be improved to maximize the indirect reinforcement effect and further increase the strength of the reinforced soil.

关 键 词：加筋土强度 间接加筋作用 黏聚力 土-筋界面参数 拉断破坏 黏着破坏 

分 类 号：TU43.1[建筑科学—岩土工程]