渠内水对寒旱区渠基土冻结过程影响的试验研究  

Experimental study on influence of canal water on freezing process of canal foundation soil in cold and arid regions

作　　者：孙雯 宋玲[1] 许清峰 陈新瑞[1] 杨禹锟 SUN Wen;SONG Ling;XU Qingfeng;CHEN Xinrui;YANG Yukun(College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003, China;Hongshanzui Power Plant of Tianfu Energy Co., Ltd., Shihezi, Xinjiang 832000, China;College of Mechanical and Electrical Engineering, Shihezi University, Shihezi, Xinjiang 832003, China)

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832003 [2]新疆天富能源股份有限公司红山嘴电厂,新疆石河子832000 [3]石河子大学机械电气工程学院,新疆石河子832003

出　　处：《排灌机械工程学报》2022年第4期366-371,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51669031)。

摘　　要：为研究渠内水对渠基土冻结过程的影响,采用由箱体、制冷系统、补水系统和量测系统构成的冻胀装置,进行了开放系统下的停水渠道和过水渠道的室内模型试验,研究渠基土的温度场、冻后含水率和冻结过程中马氏瓶补水量的变化规律.试验结果表明:渠道断面形状和渠内水体影响渠基土温度场的分布,停水渠道和过水渠道在靠近渠槽线附近的等温线形状和疏密程度不同,渠基土的断面温度场分布不均,过水渠道仅在水位线以上的渠基土内出现负温;停水渠道和过水渠道的马氏瓶累积补水量分别为16873 mL和16051 mL,马氏瓶补水分为快速补水、补水速率减缓和停止补水3个阶段;与初始含水率17%相比,无论渠内是否过水,从渠顶沿渠坡向下冻后含水率的值均增大.在工程设计与理论计算时应分别考虑运行方式改变对渠道冻结的影响.An indoor model test of the water-stop canal and the water-supply canal under the open system was carried out by using the frost-expansion device composed of the cabinet,the cooling space,the water supplement system and the measurement system.The changes of the temperature field of the canal foundation soil,the moisture content after freezing and the replenishment of the Markov flask during freezing were studied.The test results show that the shape of the canal section and the water in the canal affect the distribution of the temperature field of the canal soil,the shape and density of the isotherms of the stop-water canal and the water-supply canal near the trench are different,the tempe-rature field distribution of the canal foundation soil is uneven,the overwater canal only has negative temperature in the foundation soil above the water level line.The cumulative water replenishment vo-lume of the Markov bottle in the water-off canal and the water-passing canal is 16873 mL and 16051 mL,respectively.The replenishment of the Markov bottle consists of three stages:rapid replenish-ment,slow replenishment rate and stop replenishment.Compared with the initial moisture content of 17%,regardless of whether there is water in the canal,the value of water content increases after free-zing down from the top of the canal along the slope of the canal.In engineering design and theoretical calculation,the impact of changes in operation mode on canal freezing should be considered separately.

关 键 词：寒旱区渠道 模型试验 开放系统 冻结 水分迁移 

分 类 号：TU411[建筑科学—岩土工程]