| 岩土体综合导热系数影响因素研究 |
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| 作者姓名： | 周阳 张卉 桂忠强 王克 张亚鸽 |
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| 作者单位： | 陕西省地质调查中心,西安 710068 |
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| 基金项目： | 陕西省公益性地质调查专项“陕西省大中型城市浅层地热能调查评价(编号: 20130202)”和陕西省公益性地质工作“陕西省浅层地热能赋存规律及开发利用关键技术研究(编号: 20170201)”项目联合资助 |
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| 摘 要： | 为缓解中国能源消耗与经济发展的矛盾,高效调整国家能源结构,开发利用绿色的地热能已是大势所趋。通过室内测试法和现场热响应试验,研究了不同岩土体的导热系数特征值及其影响因素。研究结果表明: 岩土体导热系数与天然含水率和孔隙率呈负相关,与天然重度和干燥重度呈正相关; 导热系数受干燥重度和孔隙率影响程度较大,受天然含水率和天然重度影响程度较小。通过比较不同加热功率和单、双U地埋管换热器的现场热响应试验测定的各类岩土体导热系数的差异可知,大功率(6 000 W)情况下岩土体综合导热系数比小功率(4 000 W)时大10%~30%; 在相同功率条件下,同一场地内双U地埋管换热器导热系数比单U地埋管大30%左右,使用双U地埋管换热器可有效减少成孔深度及个数。通过系统分析岩土体导热系数的影响因素,为地热能的勘查评价提供数据和理论支持,旨在促进区域地热能开发利用,为构建环境友好型社会服务。
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| 关 键 词： | 岩土体 导热系数 影响因素 地热 热物性测试 |
| 收稿时间： | 2017-06-30 |
Study on influencing factors of comprehensive thermal conductivity of rock and soil |
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| Authors: | ZHOU Yang ZHANG Hui GUI Zhongqiang WANG Ke ZHANG Yage |
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| Institution: | Shaanxi Geological Survey Center, Xi'an 710068, China |
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| Abstract: | In order to alleviate the contradiction between energy consumption and economic development in China, and adjust the national energy structure effectively, the government vigorously encourages to develop and use the green geothermal energy. Through the indoor test method and on-site thermal response experiment, the authors summarized the thermal conductivity characteristics and the influencing factors for different rock and soil. The results show that the thermal conductivity is in negative correlation with natural moisture content and porosity, and in positive correlation with natural weight and drying weight. The thermal conductivity is more affected by drying weight and porosity, and less affected by natural moisture content and natural weight. Through comparing the difference between the heating power and the thermal conductivity for the single and double U ground heat exchangers, the authors summarized that the comprehensive thermal conductivity of rock and soil in high power (6 000 W) is 10%~30% higher than that in low power (4 000 W). In the same power condition and the same site, the thermal conductivity for double U ground heat exchanger is about 30% higher than that for the single U ground heat exchanger. The utilization of double U ground heat exchanger can effectively reduce the hole depth and quantity. Through systematically analyzing the influencing factors of thermal conductivity of rock and soil, this paper provides statistical and theoretical support for geothermal energy exploration and evaluation. The results could promote the development and utilization of regional geothermal energy and be used for the construction of environment-friendly society. |
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| Keywords: | rock and soil thermal conductivity influencing factors geothermal energy thermal property test |
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