堆石料注浆技术及注浆后力学性质试验研究  

Experimental study on grouting technology of rockfill and mechanical properties after grouting

作　　者：邓成进 党发宁[1] 苗喆[2] 陈兴周[3] DENG Cheng-jin;DANG Fa-ning;MIAO Zhe;CHEN Xin-zhou(Institute of Geotechnical Engineering,Xi'an University of Technology,Xi'an 710065,China;Northwest Engineering Corporation Limited,Xi'an 710065,China;School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710065,China)

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [3]西安科技大学建筑与土木工程学院,陕西西安710065

出　　处：《岩土工程学报》2019年第10期1907-1913,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2017YFC0404803)

摘　　要：采用自密实砂浆对砂岩堆石料进行现场注浆试验,验证堆石料注浆扩散范围的可控性及注浆技术的可行性;该注浆技术施工简单,注浆后堆石料之间形成砂浆胶结结构,减小了堆石料的孔隙率,改善了堆石料的力学性质。同时开展了室内静力大三轴试验,对比分析了注浆前后及不同级配特征情况下注浆堆石料的力学特性;研究了围压、粗颗粒含量对注浆堆石料力学性质的影响,讨论了不同围压、不同级配特征堆石料的强度参数和变形特征。试验表明,注浆极大提高了堆石料抵抗变形的能力;粗颗粒含量越高,骨架作用越显著,注浆后能形成相对稳定的胶结结构,堆石料的强度参数越高,抵抗变形的能力越好。The self-compacting mortar is used to carry out on-site grouting tests on sandstone rockfill materials to verify the controllability of the diffusion range of rockfill grouting and the feasibility of grouting technology.The tests show that the grouting reduces the porosity of the rockfill and has mortar cementing between the rockfill materials, which improves the mechanical properties of the rockfill materials, and the grouting construction technology is simple.The laboratory static triaxial tests are carried out to study the mechanical properties of rockfill, and they are compared before and after grouting owing to the characteristics of different grades of rockfill.The influences of confining pressure and fine particle content on the mechanical properties of grouted rockfill are studied.The strength parameters and deformation characteristics of different confining pressures and gradation characteristics are discussed.The experimental results show that the capability of the rockfill to resist deformation is greatly improved after grouting.And the higher the content of coarse particles, the more significant the skeleton effect.The relatively stable cementing structure can be formed after grouting, and the higher the strength parameters of rockfill, the better its resistance to deformation.

关 键 词：自密实砂浆 注浆堆石料 粗颗粒 胶结结构 

分 类 号：TU431[建筑科学—岩土工程]