基于碾压应力的土石坝料压实质量控制方法  

Quality Control Method for Compaction of Earth-Rock Dam Materials Based on Soil Stress

作　　者：何素飞 华天波 杜智毅 李新雨 刘欣 霍苗 HE Sufei;HUA Tianbo;DU Zhiyi;LI Xinyu;LIU Xin;HUO Miao(College of Water Conservancy and Hydropower Engineering,Sichuan Agricultural University,Ya an 625014,Sichuan,China;PowerChina Chengdu Engineering Corporation Limited,Chengdu 611130,Sichuan,China)

机构地区：[1]四川农业大学水利水电学院,四川雅安625014 [2]中国电建集团成都勘测设计研究院有限公司,四川成都611130

出　　处：《水力发电》2024年第8期44-51,102,共9页Water Power

基　　金：四川省自然科学基金资助项目(2022NSFSC1123);省级大学生创新创业训练计划项目资助(S202310626030);四川农业大学科研启动资助项目(031/2322996021)。

摘　　要：坝料压实质量是土石坝施工质量控制的关键内容。在长河坝填筑现场进行碾压应力测试,建立土应力与坝料干密度关系模型,得出对应压实密度标准的土应力控制值;构建Midas三维有限元分析模型,模拟坝料碾压过程中的应力动态变化,根据土应力控制值来判断坝料压实质量。研究结果表明:坝料土应力与干密度之间存在较强的线性关系,其线性模型平均决定系数为0.9;对应坝料干密度控制标准,反滤料1上层、中层、下层土体的应力控制值分别为1.465、1.064、0.773 MPa,反滤料3上层、中层、下层的土体应力控制值分别为0.926、0.774、0.664 MPa;运用构建的Midas模型实时监测碾压应力变化,可知反滤料1和反滤料3分别在振碾6遍和8遍后整体达到压实密度标准。The compaction quality of dam materials is the key content of construction quality control for earth-rock dam.A model of the relationship between soil stress and dry density of dam material is established by the field compaction soil stress test in Changheba Dam,and the soil stress control value of corresponding dam material is obtained.The Midas three-dimensional finite element model is established to simulate the dynamic change of soil stress during the compaction process and control the compaction quality of dam materials in real time according to the soil stress control value.The results show that,(a)the average determination coefficient of the regression model between the measured soil stress and dry density is 0.90,indicating a strong correlation;and(b)according to the control standard of dry density,the soil stress control values of upper,middle and lower layers of filter material-1 are 1.465 MPa,1.064 MPa and 0.773 MPa,respectively,and the corresponding soil layer stress control values for filter material-3 are 0.926 MPa,0.774 MPa and 0.664 MPa,respectively.The Midas model is used to monitor the change of soil stress,and the results show that the filter material-1 and filter material-3 have reached the compaction quality standard after 6 and 8 times of vibratory compaction,respectively.

关 键 词：土石坝料 振动碾压 压实质量 土应力 干密度 Midas模型 

分 类 号：TV523[水利工程—水利水电工程]