橡胶颗粒混合土加筋路堤稳定性研究  

Stability Study of Reinforced Embankment with Rubber Particles Mixed Soil

作　　者：李涛[1] 李越 舒佳军 张瑞海 刘波[1,2] LI Tao;LI Yue;SHU Jiajun;ZHANG Ruihai;LIU Bo(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;National Key Laboratory for Disaster Prevention,Control and Intelligent Construction of Tunnel Engineering,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与土木工程学院,北京100083 [2]隧道工程灾变防控与智能建养全国重点实验室,北京100083

出　　处：《华南理工大学学报(自然科学版)》2025年第2期124-135,共12页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(42172319)。

摘　　要：为了减少废旧橡胶轮胎带来的环境污染,将其加工成衍生集料应用于工程加固已成为一种有效的解决措施。当前,土工格栅加筋技术在路堤、边坡工程中应用广泛,但受土资源限制,大多采用当地的细集料进行回填夯实,导致土工格栅无法充分发挥加筋效果。因此,提出废旧轮胎橡胶颗粒与土工格栅复合加筋路堤的方法解决以上问题。通过三轴剪切试验,研究了橡胶颗粒含量(质量分数)(0%(纯砂)、5%、10%、15%和20%)对混合土剪切特性的影响,并开展土工格栅拉拔试验,分析了橡胶颗粒含量对单向、双向和三向土工格栅拉拔特性的影响及其机理,进而通过室内试验和数值模拟方法,分析了橡胶颗粒混合土加筋路堤的稳定性。结果表明:当橡胶颗粒含量增加时,混合土的弹性模量呈现逐渐降低的趋势,同时,抗剪强度指标呈现先增后减的趋势,在含量15%时达到最大值;3种土工格栅在混合土中的峰值拉拔力随着橡胶含量的增加也呈现先增后减的趋势,在含量为15%时达到最大值;在双向和三向土工格栅加筋路堤中分别掺加含量为15%的橡胶颗粒可以减小路堤约19%和23%的沉降量,以及约18%和23%的土压力;复合加筋层的存在明显限制了路堤边坡破坏滑裂面的发展深度,提高了路堤抵抗变形的能力。To reduce the environmental pollution caused by waste rubber tires,it is an effective solution to process them into derived aggregates and apply them in engineering reinforcement.Currently,geogrid reinforcement technology is widely used in embankment and slope projects.However,due to the limitation of soil resources,most of the local fine aggregates are used for backfill and compaction,which leads to the geogrid not being able to give full play to the reinforcing effect.Therefore,this paper proposed the method of composite reinforced embankment of waste tire rubber particles and geogrid to solve the above problems.The influence of rubber particle content(0%,5%,10%,15%,and 20%)on the shear characteristics of the mixed soil was examined using a triaxial shear testing system.Additionally,pullout tests on geogrids were conducted to investigate the effects and mechanisms of rubber particle content on the pullout characteristics of uniaxial,biaxial,and triaxial geogrids.Finally,the deformation characteristics and stability of reinforced soil embankment with rubber granular soil mixture were analyzed by indoor tests and numerical simulation methods.The results indicate that the elastic modulus of the mixed soil gradually decreases as the rubber particle content increases.At the same time,the shear strength index shows an initial increase followed by a decrease,reaching its maximum value at a content of 15%.The peak tensile force of the three types of geogrids in the mixed soil follows the same trend with its maximum value at a content of 15%.The addition of 15%rubber particles in bi-axial and tri-axial geogrid-reinforced embankments reduces the settlement of the embankment by approximately 19%and 23%,respectively,as well as the lateral earth pressure by approximately 18%and 23%.The presence of the composite reinforcement layer significantly limits the development depth of the slope failure slip surface,thus enhances the embankment’s resistance to deformation.

关 键 词：废旧轮胎橡胶颗粒 混合土 加筋路堤 剪切特性 拉拔特性 变形特性 

分 类 号：TU411[建筑科学—岩土工程]