组合式刚塑带加筋土强度的理论分析与试验验证  

Theoretical analysis and experimental verification of the strength of composite soils reinforced with rigid plastic belts

作　　者：雷胜友[1] LEI Shengyou(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《地震工程学报》2023年第5期1001-1007,共7页China Earthquake Engineering Journal

基　　金：国家级大学生创新创业训练计划资助项目(201810710010)。

摘　　要：根据试验结果和理论研究,推导得到水平向与环向组合式刚塑带加筋土的强度表达式,并考虑筋材强度的发挥和筋土比例,随后进行详细讨论分析。研究表明,组合式刚塑带加筋土的黏聚力有很大的提高,如果环内含有草根,则形成二次加筋作用,其强度会进一步提高。用文中所推导出的强度公式得到的计算曲线与试验曲线吻合较好,最大误差在5.1%以内,同时加筋材料强度的发挥在1%~7.5%。最后对加筋土强度指标进行分析,研究发现组合式刚塑带加筋土的黏聚力增大了2.75~5.35倍,内摩擦角最大提高了21.7%;而水平向刚塑带加筋土、环向刚塑带加筋土的黏聚力分别增大了0.5~2.767倍、0.732~3.417倍,而它们内摩擦角则增加不多,最大增加了2.2°。综合考虑认为,“4环+3水平”组合加筋形式的加筋效果最好,其次是“2环+4水平”组合加筋形式。在实践中,可参照以上两种加筋形式进行边坡、地基加固修复等。In this study,the strength expressions of horizontal and circular composite soils reinforced with rigid plastic belts were derived using experiments and theoretical analysis by considering the strength of the reinforcement material and the reinforcement material/soil ratio.Results revealed that the reinforced composite soil has greatly increased cohesion compared with plain soil.If there are grass roots in the soil inside the ring,a secondary reinforcement effect would form,and its strength would further improve.Good agreement between the calculated curve and the experimental curve was found,with a maximum error of 5.1%.However,the mobilization of the reinforced material is within 1%-7.5%.Lastly,analysis was performed on the strength indicators of the reinforced soil.Results showed that compared with plain soil,the cohesion and maximum internal friction angle of the reinforced composite soil are increased by 2.75-5.35 times and 21.7%,respectively.The cohesion values of the horizontal and circular reinforced soils are increased by 0.5-2.767 times and 0.732-3.417 times,respectively,while the maximum internal friction angle is increased by 2.2°.It is proposed that the combination of“four circular+three horizontal”reinforcement has the best reinforcement effect,followed by the combination of“two circular+four horizontal”reinforcement.In practice,the above two reinforcement forms can be referred to for the reinforcement and repair of the slope and foundation.

关 键 词：极限平衡状态 刚塑带 加筋作用 黏聚力增量 内摩擦角增量 水平向拉力 环向拉力 

分 类 号：TU528.57[建筑科学—建筑技术科学]