软岩堆石料的击实特性与尺寸效应研究  

Compaction Characteristics and Size Effects of Soft Rock Rockfill

作　　者：赵娜[1] 左永振[1] 陆世权 周跃峰[1] 张婷[1] ZHAO Na;ZUO Yong-zhen;LU Shi-quan;ZHOU Yue-feng;ZHANG Ting(Key Laboratory of Geotechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;Chongzuo Zuojiang Drought Control Project ManagementCenter,Chongzuo 532200,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [2]崇左市左江治旱工程管理中心,广西崇左532200

出　　处：《长江科学院院报》2024年第11期158-162,180,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金联合基金重点项目(U21A20158);中央级公益性科研院所基本科研业务费项目(CKSF2023318/YT)。

摘　　要：软岩堆石料的干密度是土石坝设计和施工的重要控制指标,直接决定了土石坝施工期和运行期的沉降量。采用Φ950 mm×H1000 mm的超大型击实仪,针对强风化粉砂质泥岩、弱风化粉砂质泥岩、弱风化5∶5强风化粉砂质泥岩混合料,进行了483、992、1475、1957、2681 kJ/m^(3)共5种单位体积击实功下的击实试验,最大干密度成果与Φ300 mm×H285 mm的大型击实仪成果进行了对比。试验成果表明,击实干密度随单位体积击实功增加而增加,在击实功低于2000 kJ/m^(3)时,干密度随击实功增加较快,击实功超过2000 kJ/m^(3)后增加速率变缓,增量较小,再增加击实功并不能有效提高干密度。相同单位击实功下,超大型击实试验的最大干密度比大型击实试验成果略低0.01~0.02 g/cm^(3)。软岩堆石料在击实特性方面的尺寸效应不明显,在重型标准击实功能条件下,室内采用Φ300 mm的击实仪进行软岩堆石料的击实特性研究,是比较适宜的。The dry density of soft rock rockfill is an important control index for the design and construction of earth-rock dams,as it directly influences the settlement of earth-rock dams during construction and operation.TheΦ950 mm×H1000 mm super-large compactor was used to conduct compaction tests under five levels of compaction energy,including 483,992,1475,1957,2681 kJ/m^(3),for the strongly weathered silty mudstone,weakly weathered silty mudstone,and a mixture of silty mudstone.The results were compared with those fromφ300 mm×H285 mm large compaction test.The test results show that the dry density increases with the increase in compaction energy.When the compaction energy is less than 2000 kJ/m^(3),the dry density increases rapidly with increasing the compaction energy.When the compaction energy exceeds 2000 kJ/m^(3),the rate of increase slows down and the increment is small.Further increasing the compaction energy does not significantly improve the dry density.Under the same compaction energy,the maximum dry density from the ultra-large compaction is slightly lower(by 0.01 to 0.02 g/cm^(3))than that from the large compaction test.The size effect of soft rock rockfill on compaction characteristics is not significant,and under the heavy standard compaction functional conditions,it is appropriate to use a compaction instrument with a diameter of 300 mm to study the compaction characteristics of soft rock rockfill indoors.

关 键 词：软岩堆石料 超大型击实 干密度 击实功 尺寸效应 破碎率 

分 类 号：TU411[建筑科学—岩土工程] TV641[建筑科学—土工工程]