粗粒氯盐渍土路用性能试验研究  

Experimental study on road performance of coarse-grained chlorine saline soil

作　　者：邓苗毅[1] 闫启耀 王金山 DENG Miaoyi;YAN Qiyao;WANG Jinshan(School of Civil Engineering and Architecture,Zhengzhou University of Aeronautics,Zhengzhou 450046,Henan,China;School of Civil Engineering&Architecture,Xinjiang University,Urumqi 830047,Xinjiang,China)

机构地区：[1]郑州航空工业管理学院土木建筑学院,河南郑州450046 [2]新疆大学建筑工程学院,新疆乌鲁木齐830047

出　　处：《山东大学学报（工学版）》2022年第1期74-84,共11页Journal of Shandong University（Engineering Science）

基　　金：中原科技创新领军人才资助项目(194200510015)。

摘　　要：为探究粗粒氯盐渍土的路用性能,通过室内动三轴试验和承载比试验,研究粗粒氯盐渍土的动态回弹模量和承载比CBR(California bearing ratio,CBR)受应力级位、含水率及含盐量影响的演变规律。试验结果表明:动态回弹模量随围压、体应力的增加而增大,随偏应力的增大而减小,CBR随单位压力的增大而增大;含盐量和含水率越高,应力对动态回弹模量和CBR影响越明显;相同应力水平下,随含水率、含盐量的增高,动态回弹模量和CBR的降低幅度逐渐增大,且盐分影响较水分更为显著。数据分析发现,所测得回弹模量与CBR最小分别为51.05 MPa和11.98%,均满足路基规范对填料路用性能的要求,并评价了该类盐渍土作为路基填料的可行性。研究成果为有效利用粗粒盐渍土填筑路基提供科学依据。To explore the road performance of coarse-grained chlorine saline soil,indoor dynamic triaxial test and California bearing ratio test were carried out to investigate the evolution of dynamic resilient modulus(M_(R))and CBR of coarse-grained chlorine saline soil under the influence of stress level,water content and salt content.The test results showed that the dynamic resilient modulus increased with the increase of confining pressure and bulk stress,and decreased with the increase of deviator stress,but the CBR increased with the increase of unit pressure corresponding.The higher the salt content and water content was,the more obvious influence of stress on its dynamic resilient modulus and CBR was.Under the same stress level,the decrease of dynamic resilient modulus and CBR gradually increased with the increase of salt content and moisture content,and the effect of salt tended to be more significant than that of water.The analysis of test data showed that the minimum measured values of resilient modulus and CBR of coarse-grained saline soil were 51.05 MPa and 11.98%respectively,which met the requirements of the relevant specifications for the road performance of subgrade fillings,and the feasibility of this kind of saline soil as subgrade filling was comprehensively evaluated.The research results could provide a scientific basis for effectively using coarse-grained saline soil to fill subgrade.

关 键 词：粗粒氯盐渍土 路用性能 动态回弹模量 CBR 动三轴试验 加州承载比试验 路基填料 

分 类 号：TU443[建筑科学—岩土工程]