多排冻结管斜型排布温度场发展规律数值分析

Numerical Analysis of Temperature Field Developmentin Inclined Layout of Multi-Row Frozen Pipes

在人工冻结法施工情况下,打孔布置冻结管均为竖直排布,对3种多排冻结管斜型排布方式的温度场发展规律进行了数值对比分析,并针对最优排布方式下不同倾斜角度的温度场发展规律进行对比研究.其中斜型1排布方式是冻结管九宫格方式,中间3根竖直排布,其余冻结管向外倾斜.研究结果:斜型1排布方式冻结范围广,冻结强度达到施工要求;斜型1情况下的8°倾斜角度是所有情况中的最优解,且冻结范围1.8 m,冻结温度为-10℃,随着冻结管间距改变,交圈发展速度越来越快;靠近冻结管的土体,冻结强度大且冻结速率快.在实际工程中,采用此种排布方式和倾斜角度节约资金和材料,可为以后的工程提供相关理论依据.

In the case of the manual freezing method,the freezing pipes are all vertically arranged in the hole-punching arrangement.In the report,the numerical compare and analysis of the temperature field development law of three kinds of multi-row freezing pipes were performed,and the temperature field development law of different tilt angles under the optimal freezing method was compared.Among them,the oblique type 1 arrangement was the nine-lattice arrangement of the freezing tube,the middle three were vertical arrangement,the rest of the freezing tubes were tilt outwards.The results indicated that type 1 arrangement method has a wide range of freezing,and the freezing strength meets the construction requirements;In the case of inclined type 1,the 8°tilt angle is the optimal solution in all cases,the freezing range is 1.8 m,and the freezing temperature is-10℃;With the change of the freezing tube spacing,the development speed of the cross ring is faster and faster,the soil near the freezing pipe has higher freezing strength and faster freezing rate.In practical projects,this arrangement and tilt angle can save money and materials,which can provide relevant theoretical basis for future projects.