地铁联络通道冻土帷幕薄弱部位及其成因分析
董新平1井景凤2王余飞1张毅豪1
Weak Parts and Cause Analysis of Frozen Soil Wall in Metro Cross Passage
DONG XinpingJING JingfengWANG YufeiZHANG Yihao
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作者信息:1.1.郑州大学水利与土木学院， 450001， 郑州；
2.2.洛阳市轨道交通集团有限责任公司， 471009， 洛阳
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Affiliation:School of Hydraulic and Civil Engineering, Zhengzhou University, 450001, Zhengzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.10.005
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中图分类号/CLCN:U455.49
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栏目/Col:研究报告
摘要:
提出将冻土帷幕演变过程的关键阶段细分,并计算冻土帷幕温度场冻结锋面和特征等温线坐标的冻土帷幕整体性状确定性分析方法，对冻结帷幕薄弱部位、特征及成因进行了研究。结果表明:联络通道冻结管单侧开孔和放射状布置形式，使得冻土帷幕局部区域的冻结壁厚度和平均温度存在薄弱点；辅助冻结侧的冻结壁厚度大于其设计值，平均温度较低，而主冻结侧的冻结壁厚度小于其设计值，平均温度较高；联络通道泵站下部冻结管相交区域冻结壁形成最晚，第II冻结壁厚度最薄；联络通道拱部与边墙的角部连接区域冻结壁交圈时间最长，辅助冻结侧边墙冻结管间距较大区域的冻土帷幕厚度最薄。冻结法施工时，测温孔位置和长度的设计应覆盖薄弱点，施工中应对薄弱点进行重点监控。
Abstracts:
The key stages subdivision of frozen soil wall evolution process, the deterministic analysis method of frozen soil wall overall properties for calculating frozen soil wall temperature field freezing front and characteristic isothermal coordinate are put forward, so as to study the wall weak parts, characteristics and the causes. Results show that the cross passage freezing pipe single side hole and the radius layout format create weak points in frozen wall thickness and average temperature in part of the frozen soil wall. The supporting frozen side wall thickness is larger than its design value, the average temperature is relatively low, while the main frozen side wall thickness is smaller than its design value and the average temperature is relatively high. The frozen wall in the freezing pipe crossing section under the cross passage pumping station bottom forms the latest, and the II frozen wall thickness is the smallest. The frozen wall closing time of the connection area between cross passage arch and side wall corner is the longest. Supporting frozen side wall freezing pipe with larger spacing has the thinnest frozen soil wall. When freezing construction method is applied, location and length design of temperature measuring holes should cover weak points, and the weak points should be emphatically monitored in the construction.
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