改良黄土强度特性与工程处置试验研究  

EXPERIMENTAL RESEARCH ON STRENGTH CHARACTERISTICS AND ENGINEERING TREATMENT OF IMPROVED LEOSS SOIL

作　　者：李志清[1,2,3] 余文龙[2] 范林峰[2] 付乐[4] 胡瑞林[2] 林杜军 王艳萍 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]中国科学院工程地质力学重点实验室中国科学院地质与地球物理研究所,北京100029 [3]同济大学岩土及地下工程教育部重点实验室,上海200092 [4]北京科技大学土木与环境工程学院,北京100083 [5]中煤西安设计工程有限责任公司,西安710054 [6]中国公路工程咨询集团有限公司,北京100083

出　　处：《工程地质学报》2011年第1期116-121,共6页Journal of Engineering Geology

基　　金：河海大学岩土力学与堤坝工程教育部重点实验室开放基金项目(GH200802);同济大学岩土及地下工程教育部重点实验室开放基金项目(KLE-TJGE-B0903);中国科学院工程地质力学重点实验室开放基金项目(2008);中国科学院知识创新工程青年人才领域前沿项目(2009);国家科技支撑计划项目(2008BAK50B04-3)

摘　　要：本文针对山西朔州典型黄土,利用素黄土与石灰粉煤灰、石灰水泥、水泥粉煤灰三种改良黄土,进行了击实特性、抗剪强度特性及崩解特性试验研究,提出了黄土改良的最佳方案,并采用该方案对山西某煤矿电梯井填方段进行了数值模拟分析,验证了石灰粉煤灰改良黄土工程应用的可行性。试验结果表明:粉煤灰与黄土形成致密的混合结构,石灰的掺入,激活了粉煤灰的活性,发生了一系列的水化反应,使改良黄土的强度大大提高,改良黄土在物理力学性质方面有明显改善。According to the typical loess in Shuozhou in Shanxi province,tests on its compaction characteristics,shear strength characteristics and disintegration are carried out.The original loess and three improved loess soils are used in the tests.The three loess soils are improved with lime and fly-ash,lime and cement,cement and fly-ash,respectively.The best improved soil plan is brought out.The improve soil is used in the filling engineering of elevator shaft in a pit.The result of numerical simulation indicates that it is feasible to use the improved loess of lime and fly-ash in the engineering project.The test results indicate that the compact hybrid structure is formed by fly ash and loess.The compact hybrid structure is formed by fly ash and loess.The activity of fly ash is activated as a result of the lime mixing.A series of hydration reaction of silicates prompt the intensity of loess and the physical and mechanical properties of improved loess are improved noticeably.

关 键 词：黄土 改良 击实特性 抗剪强度 

分 类 号：TU444[建筑科学—岩土工程]