渠道保温防冻胀中冻土层等效导热系数的计算

张宇峰; 何武全; 赵彦琳

引用本文:	张宇峰,何武全,赵彦琳.渠道保温防冻胀中冻土层等效导热系数的计算[J].灌溉排水学报,2017,36(6):.
	ZHANG Yufeng,HE Wuquan,ZHAO Yanlin.渠道保温防冻胀中冻土层等效导热系数的计算[J].灌溉排水学报,2017,36(6):.

【打印本页】【下载PDF全文】【查看/发表评论】【EndNote】【RefMan】【BibTex】

←前一篇|后一篇→

过刊浏览高级检索

本文已被：浏览 2462次下载 0次
分享到：微信更多字体:加大+\|默认\|缩小-
渠道保温防冻胀中冻土层等效导热系数的计算
张宇峰，何武全，赵彦琳
杨凌职业技术学院，陕西杨凌 712100；.西北农林科技大学水利与建筑工程学院，陕西杨凌 712100

摘要:

针对渠道保温防冻胀设计中计算保温板厚度时关键参数冻土层等效导热系数采用经验法确定、计算误差大等问题，建立了北方寒冷地区粉质黏土的基于分形理论的冻土层等效导热系数λ*的计算公式，利用蛤蟆通灌区试验资料拟合得到系数C的计算公式，并通过内蒙古河套灌区、新疆冲乎尔灌区和黑龙江蛤蟆通灌区渠道保温防冻胀试验资料对建立的冻土层等效导热系数公式进行了验证。结果表明，计算得到的聚苯板厚度与试验观测的最佳厚度基本一致，最大相对误差仅为7.0%，说明其计算精度较高。利用该公式计算得出了粉土及粉质黏土常用冻土层等效导热系数，对于地下水埋深较浅、渠基土冻结期间存在水分迁移、冻胀较为严重的地区，在实际工程应用中可根据设计渠道情况进行选用。

关键词: 渠道防渗；保温防冻胀；分形理论；等效导热系数

DOI：

分类号:

基金项目:

Calculating the Effective Thermal Conductivity Coefficient of the Frozen LCalculating the Effective Thermal Conductivity Coefficient of the Frozen Layerin Thermal-conservative and Freezing-resistant Cannel ayerin Thermal-conservative and Freezing-resistant Cannel

ZHANG Yufeng, HE Wuquan, ZHAO Yanlin

Yangling Vocational & Technical College, Yangling 712100, China； College of Water Resources and Architectural Engineering , Northwest A&F University, Yangling 712100, China

Abstract:

Empirical methods commonly used for calculating the effective thermal conductivity coefficient of the frozen layer in thermal-conservative and freezing-resistant cannels could give rise to considerable errors. To overcome this problem, we proposed a fractal-based model in this paper to calculate effective thermal conductivity coefficient of silty clay in permafrost in the cold region of northern China. We calculated the coefficient C using data obtained from Ha Matong Irrigation District and then applied and tested the model against data obtained fromHetao Irrigation District in Inner Mongolia, Chong Huer Irrigation District in Sinkiang, and Ha Matong Irrigation District in Heilongjiang. The results showed that the calculated thickness of polyphenyl plate was almost the same as the optimal thickness with an error of just 7.0%, proving the accuracy of the model. We also calculated the effective thermal conductivity coefficient of silt and silty clay in permafrost. The model can be used in regions where groundwater table is shallow and there is soil water movement when soils are freezing with prolonged frost heaves.

Key words: anti-seepage channels; heat preservation and frozen prevention; fractal theory; effective thermal conductivity coefficient.