CAJ | 학술논문

废旧轮胎橡胶颗粒用于填埋场衬垫材料改性，有望提高衬垫系统的有效性。击实性能是衬垫设计和施工的基础，但目前缺乏针对性研究，击实机理不够明确。开展废旧轮胎胶粉－黏土混合土的击实试验研究，探讨橡胶颗粒粒径、掺入比等因素对混合土击实性能的影响规律和压实机制。研究表明，当橡胶掺入比从0增大到25％时，胶粉－高岭土的最优含水率增大，胶粉－红黏土的最优含水率减小，变化在2.4％范围内；混合土的最大干密度从1.65 g·cm－3减小至约1.40 g·cm－3；试验选用的橡胶颗粒粒径对最优含水率和最大干密度差异不显著。在击实过程中橡胶颗粒回弹和橡胶颗粒比表面积变化两种效应下，最优含水率随橡胶掺入比的增加表现出减小（大颗粒时）、不变和增加（小颗粒时）的变化规律，并与基质土的性质密切相关。给出了初步设计时改性黏土含水率和干密度的控制方法，能够基本满足规范中对压实黏土的含水率和压实度的要求，且其渗透系数小于1.0×10－7 cm·s－1。
폐구륜태상효과립용우전매장츤점재료개성，유망제고츤점계통적유효성。격실성능시츤점설계화시공적기출，단목전결핍침대성연구，격실궤리불구명학。개전폐구륜태효분－점토혼합토적격실시험연구，탐토상효과립립경、참입비등인소대혼합토격실성능적영향규률화압실궤제。연구표명，당상효참입비종0증대도25％시，효분－고령토적최우함수솔증대，효분－홍점토적최우함수솔감소，변화재2.4％범위내；혼합토적최대간밀도종1.65 g·cm－3감소지약1.40 g·cm－3；시험선용적상효과립립경대최우함수솔화최대간밀도차이불현저。재격실과정중상효과립회탄화상효과립비표면적변화량충효응하，최우함수솔수상효참입비적증가표현출감소（대과립시）、불변화증가（소과립시）적변화규률，병여기질토적성질밀절상관。급출료초보설계시개성점토함수솔화간밀도적공제방법，능구기본만족규범중대압실점토적함수솔화압실도적요구，차기삼투계수소우1.0×10－7 cm·s－1。
As a modified material,the waste tire granulated rubber is expected to enhance the effectiveness of liner system in landfill.The existing results of compaction tests are in conflict to some extent since the compaction mechanism is complex.The compaction test of waste tire ground rubber and clay mixtures is conducted and the effect of rubber properties on compaction performance is studied.When the rubber mixing content increases from 0% to 25%,the optimum water content of the Kaolin mixture increases and that of the red clay mixtures decreases. The change of optimum water content of the mixtures is within 2.4% and the maximum dry density decreases from 1.65g·cm-3 to 1.40g·cm-3 .The 12-mesh and 30-mesh rubber used in the present study show no significant difference on the compaction performance.Under the two effects of rubber particle rebound and specific surface area change,the optimum water content can either decrease(for coarse rubber),be about the same,or increase(for fine rubber)with the increasing of rubber mixing content,.The change is closely related to the properties of the matrix soil.The control parameters of water content and dry density at the preliminary design are put forward,which can basically meet the water content and degree of compaction requirements of compacted clay liner in the specification. The hydraulic conductivity of the mixtures is below 1.0×10-7 cm·s-1 and also meets the requirements.