摘要
废旧轮胎胶粉用于填埋场衬垫材料改性,有望提高衬垫系统的有效性并扩展废旧轮胎的资源化利用途径。开展废旧轮胎胶粉–黏土混合土的内部强度和界面强度试验,探讨胶粉特征对混合土强度性质的影响规律。研究表明,随着胶粉掺入比的增加,混合土抗剪强度有所增大,无侧限抗压强度满足规范要求。当掺入比为15%,土工膜/混合土界面强度高于土工膜/高岭土,但400 k Pa压力下表现出软化特征,残余强度低于土工膜/高岭土界面;与GCL/高岭土界面相比,GCL/混合土界面强度在法向应力较小时略小,但在法向应力较大时显著增大;界面强度小于土的内部抗剪强度。总体来看,12和30目胶粉对混合土强度的影响没有显著差异,高岭土中掺入废旧轮胎胶粉不会对内部强度和界面强度产生不利影响。
Used as a modified material,the waste tire granulated rubber was expected to enhance the effectiveness of liner system in landfill and extend the utilization of the waste. The internal strength and interface shear strength tests of waste tire ground rubber and clay mixtures were conducted and the effect of ground rubber on strength properties was studied. The shear strength of the mixtures increases slightly as rubber mixing content increases,and the unconfined compressive strength can meet the requirement in the specification. When the rubber mixing content is 15%,the interface strength of geomembrane/mixtures is higher than that of geomembrane/Kaolin clay. However at the normal stress of 400 k Pa,there are stress drop for the interface of geomembrane/mixtures,which results in the lower residual strength. At low normal stresses,the interface strength of GCL/mixtures is slightly lower than that of GCL/Kaolin clay,which is opposite at high normal stresses. The interface strength is lower than the internal strength of the soil. Overall,the effects of the two rubber particle size in this study are not significant,and there are not adverse effects of the waste tire ground rubber on the internal and the interface shear strength.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第S2期4366-4372,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51008120)
武汉市青年科技晨光计划项目(201271031418)
湖北省自然科学基金资助项目(2014CFB606)
关键词
土力学
废旧轮胎
胶粉
黏土
混合土
内部强度
界面剪切强度
soil mechanics
waste tire
ground rubber
clay
mixture soil
internal strength
interface shear strength
