浅层岩土体热物性参数测定的影响因素分析  

Analysis of Influence Factors on the Determination of Thermal Property Parameters of Shallow Rock and Soil Mass

作　　者：丰莉[1] 郭文建 杨树杰 Feng Li;Guo Wenjian;Yang Shujie(College of Resources of Shandong University of Science and Technology,Taian,Shandong,271000,China;Shandong Fifth Institute of Geology and Mineral Exploration,Taian,Shandong,271000,China;Shandong Geological Exploration Institute of China Chemical Geology and Mine Bureau,Taian,Shandong,271000,China)

机构地区：[1]山东科技大学资源学院,山东泰安271000 [2]山东省第五地质矿产勘查院,山东泰安271000 [3]中化地质矿山总局山东地质勘查院,山东泰安271000

出　　处：《化工矿产地质》2024年第4期370-376,共7页Geology of Chemical Minerals

基　　金：厅局级地下岩土体热物性测试影响计算方法优化研究(编号:2021GX011)。

摘　　要：浅层地热勘查中,岩土体的热物性是区域评价和工程应用的重要参数。为提高热物性参数测定的准确性,建立了具有单项因素误差影响计算功能的传热模型,分别研判岩土体热物性测试的影响因素。结果显示:不同温度的泥浆,成孔停待10d后,热导率值基本稳定;加载功率波动时,可根据波动周期规律选择合适的加载时间与数据舍弃时间,以减少求解误差;如加载过程出现中断,运用线热源简化法计算的热导率有较大误差,中断开始时间越晚、中断时间越长,误差越大;无负荷循环测试时,15min的观测时间可得到岩土体初始平均温度;岩土体温度受四季气温影响深度主要在15m以内,最低平均温度在2、3月份,最高平均温度在8、9月份,均较当地气温约滞后2个月。In the shallow geothermal exploration,the thermal property parameters of rock and soil mass is an important for the regional evaluation and engineering application.In order to improve the accuracy of thermal property parameters,a heat transfer model with the function of calculating the influence error of single factor was established,and the influencing factors of the thermal property test of rock and soil mass are evaluated respectively.The results show:The thermal conductivity of mud at the different temperatures remains basically stable after 10 days of stopping drilling.When the loading power fluctuates,the appropriate loading time and data discard time can be selected according to the fluctuation cycle rule to reduce the solution errors.If there is an interruption in the loading process,the thermal conductivity calculated by using the line-heat-resource simplification method has a large error.The later the start time of the interruption,the longer the interruption time,the greater the error.During the no-load cycle test,the initial average temperature of rock and soil mass can be obtained at the observation time of 15min.The temperature of rock and soil mass is mainly affected by the temperature in the four seasons.The depth is mainly within 15m,the lowest average temperature is in February and March,and the highest average temperature is in August and September,which is about 2 months behind the local air temperature.

关 键 词：浅层岩土体 热物性参数 数值传热模型 影响因素 

分 类 号：P314[天文地球—固体地球物理学]