深厚表土多圈管冻结温度场演变规律研究  

Experimental Research on Multi-Circle Freezing Temperature Field for Thick Top Soil

作　　者：胡坤[1] 周国庆[1] 荆留杰[2] 王建州[1] 周杰[1] 魏亚志[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]北京三一重机有限公司,北京102206

出　　处：《采矿与安全工程学报》2010年第2期149-153,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金重点项目(50534040);国家自然科学基金项目(40471021);国家"十一五"科技支撑计划项目(2006BAB16B01)

摘　　要：为了得到深厚表土多圈管冻结温度场的演变规律,考虑压力对土体结冰温度的影响,研制了深厚表土冻结壁温度场试验系统.依据相似理论,以赵楼风井井筒冻结工程为原型,进行加载后的多圈管冻结温度场试验研究。结果表明:3圈冻结管冻结锋面交圈时间为50 d,冻结壁厚11.2 m,冻结壁平均温度-22.8℃,拟合得到冻结壁平均温度随时间变化函数T1=-3×10-93τ+2×10-52τ-0.0358τ+2.932,井帮温度随时间变化函数T2=-0.0207τ+10.32.特征面温度场进入拟稳定阶段后,冻结壁厚度基本稳定,冻结壁平均温度、井帮温度满足井筒开挖要求;特征面温度场进入稳定阶段后,冻结管冷负荷主要用于维护冻结壁向内扩展区和向外扩展区的温度.In order to get the evolution law of the multi-circle freezing temperature field for thick top soil,we establishe a test system to study the temperature field of frozen wall in in thick top soil.In this system,the effect of pressure on frozen point of soil is considered.Based on similarity theory,the experiment on muti-circle freezing temperature field after loading were carried out by taking the ventilation shaft of Zhao Lou coal mine as the prototype.The results show that the closure time of freezing front of three chilled pipes is 50 days,the thickness and the average temperature of frozen wall are 11.2m and-22.8℃,respectively.And the fitting functions of the average temperature of frozen wall and the shaft-lining temperature changing with time are T1=-3×10-9τ3＋2×10-5τ2-0.0358τ＋2.932 and T2=-0.0207τ＋10.32,respectively.When the temperature field of the characteristic surfaces is in quasi-steady stage,the thickness of frozen wall is almost stable,so the shaft-lining temperature and the average temperature of frozen wall satisfy the requirements of excavating shaft.When the temperature field of the characteristic surfaces is in steady stage,the cooling loads of chilled pipes are mainly used to maintain the temperature of inward and outward extending areas of frozen wall.

关 键 词：深厚表土 多圈管冻结 特征面 温度场 冻结壁 

分 类 号：TD265.3[矿业工程—矿井建设]