某特高土石坝防渗砾石土料含水率特性及现场改良试验研究  

Experimental Study on Moisture Content Characteristics and In-situ Improvement of Impervious Gravel Soil Material of an Ultra-high Earth-rockfill Dam

作　　者：郑星 张建博 魏伟琼 杨文超 毛华 段兴林 ZHENG Xing;ZHANG Jianbo;WEI Weiqiong;YANG Wenchao;MAO Hua;DUAN Xinglin(Power China Guiyang Engineering Corporation Limited,Guiyang,Guizhou 550081,China;Province Key Laboratory of Geomechanics and Engineering Safety,Guiyang,Guizhou 550081,China;Huaneng Lancang River Hydropower Inc.,Kunming,Yunnan 650214,China)

机构地区：[1]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081 [2]贵州省岩土力学与工程安全重点实验室,贵州贵阳550081 [3]华能澜沧江水电股份有限公司,云南昆明650214

出　　处：《水利与建筑工程学报》2022年第4期128-134,共7页Journal of Water Resources and Architectural Engineering

摘　　要：高海拔地区某300m级特高土石坝防渗土料天然含水率偏低,且高海拔气候对土料含水率有独特的影响,需要进行含水率改良试验研究。通过对该特高土石坝防渗土料天然含水率及级配改良后成品土料含水率进行大量数据分析,明确了土料进行含水率改良的必要性。针对高海拔防渗土料场气候特点,探究了土料在曝露及覆盖条件下含水率的变化规律。现场进行了大规模含水率改良工艺试验,采用了创造性的大体积料堆含水率取样方法,在土料闷制过程中进行了大量的含水率试验工作。对比试验结果表明,在覆盖条件下,加水后的土料料堆表面失水速率和含水率影响深度均低于不覆盖条件。因此提出了后续实际生产过程加强土料料堆覆盖封闭,从而避免水分过度损失的指导性建议。The natural moisture content of impervious soil material of a 300m ultra-high earth-rockfill dam in high altitude area is low,the high-altitude climate has unique impacts on the moisture content of soil material,so it is necessary to carry out experimental research on moisture content improvement.The necessity of soil moisture content improvement is clarified by analyzing numerous data on the natural moisture content of impervious soil and the moisture content of the finished soil after grading improvement for the project.According to the climate characteristics of the high-altitude impervious soil borrow,the variation pattern of soil moisture content under the conditions of exposure and coverage is explored.A large-scale moisture content improvement process test was carried out on site,and a creative moisture content sampling method of large volume pile was adopted.A large number of moisture content tests were carried out in the process of soil material stuffing.The comparative test results show that the moisture loss rate on the surface of soil pile and the influence depth of moisture content after adding water under the condition of covering is lower than that under the condition of exposure.According to the test results,the guiding suggestions for strengthening the covering and sealing of soil pile and avoiding the excessive loss of moisture in the subsequent actual production process are proposed.

关 键 词：高海拔地区 特高土石坝 砾石土 防渗土料 含水率 改良试验 

分 类 号：TU43[建筑科学—岩土工程]