超大直径隧道联络通道冻土与管片交界面冻结温度场分布规律研究  

Study on the distribution law of freezing temperature field at the interface between frozen soil and pipe segment in super large diameter tunnel connecting channel

作　　者：李明[1,2,3] 崔灏 王磊[1,2,3] 陈红蕾[2,3] LI Ming;CUI Hao;WANG Lei;CHEN Honglei(China Coal Research Institute,Beijing 100013,China;Beijing China Coal Mine Engineering Com pany Limited,Beijing 100013,China;National Engineering Research Center of Deep Shaft Construction,Beijing 100013,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]北京中煤矿山工程有限公司,北京100013 [3]煤矿深井建设技术国家工程研究中心,北京100013

出　　处：《建井技术》2024年第6期64-70,共7页Mine Construction Technology

基　　金：国家自然科学基金青年基金(52008197);北京中煤矿山工程有限公司自立科技项目(KJZH-2024-ZD-01)。

摘　　要：以北京东六环隧道盾构段联络通道冻结施工为背景,研究超大直径隧道土体与管片交界面处冻结温度场。采用现场实测和数值模拟的方法,对交界面处冻结壁的发展状况以及冻结管端部不循环段长度对交界面冻结的影响进行了分析。结果表明:同一位置的数值模拟温度变化与工程实测基本一致,能较好反映土体温度变化;在冻结过程中,同远离管片的另一截面相比,交界面处的冻结壁厚度更小,且随着冻结时间的增加,两个截面处冻结壁厚度差值逐渐增大,到冻结56d时,冻结壁上壁厚度差值达到1.04m,冻结壁侧壁厚度差值达到0.91 m;冻结管不循环段长度会明显影响交界面的冻结效果,间距平均每增加100mm,在冻结56d时的交界面冻结壁上壁厚度将减小80mm,侧壁厚度将减小60mm。研究结果可为类似的大直径隧道联络通道冻结工程提供参考。This study investigates the freezing temperature field at the interface between soil and pipe segment in a super large diameter tunnel connecting channel with the background of frozen construction in the shield segment of the Beijing East 6th Ring Road Tunnel.Through field measurements and numerical simulations,the development of the frozen wall at the interface and the impact of the noncirculating length of the frozen pipe end on the interface freezing are analyzed.The results demonstrate that the temperature changes in numerical simulation at the same location are basically consistent with engineering measurements,effectively reflecting the temperature changes in the soil.During the freezing process,the thickness of the frozen wall at the interface is smaller compared to another section farther from the pipe segment,and with the increase of freezing time,the thickness difference of the frozen wall at the two sections gradually increases.By the time of freezing at 56 d,the thickness difference of the freezing wall reaches 1.04 m,and the sidewall difference of the freezing wall reaches 0.91 m.The non-circulating length of the frozen pipe significantly affects the freezing effect at the interface;At 56 d of freezing,for a non-circular section,with an average increase of 100 mm in length,the thickness of the freezing wall at the interface will decrease by 80 mm,and the sidewall thickness will decrease by 60 mm.The research findings can serve as a reference for similar large diameter tunnel connecting channel freezing projects.

关 键 词：冻结法 超大直径隧道 交界面温度场 联络通道 数值模拟 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]