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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。
Waste tire rubber powder used for landfill liner modification, is expected to improve the effectiveness of the liner system and expand the use of waste tires recycling. The internal strength and interfacial strength of rubber powder-clay mixed soil of waste tires were tested to investigate the influence of the characteristics of rubber powder on the strength and strength of mixed soil. The research shows that the shear strength of the mixed soil increases with the increase of the mixing ratio of rubber powder, and the unconfined compressive strength meets the requirements of the specification. When the mixing ratio is 15%, the interfacial strength between geomembrane and mixed soil is higher than that of geomembrane / kaolin, but the softening characteristic under 400 kPa pressure is lower than the geomembrane / kaolin interface. Compared with GCL / kaolin interface The GCL / mixed soil interface strength is slightly smaller when the normal stress is smaller, but increases significantly when the normal stress is larger. The interface strength is lower than the internal shear strength of the soil. In general, there is no significant difference between 12 and 30 mesh powders on the strength of mixed soil, and the incorporation of waste rubber powder into kaolin will not adversely affect the internal strength and interfacial strength.