城市深埋软岩隧道压力拱演化规律试验研究
朱正超1孙意2赵何霖1邱居涛1申玉生1甘雨航1
Experimental Study on Pressure Arch Evolution Law of in Urban Deep-Buried Soft Rock Tunnels
ZHU Zhengchao1SUN Yi2ZHAO Helin1QIU Jutao1SHEN Yusheng1GAN Yuhang1
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作者信息:1.西南交通大学交通隧道工程教育部重点实验室， 610031， 成都；
2.中交铁道设计研究总院有限公司， 100032， 北京
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Affiliation:1.Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education, Southwest Jiaotong University, 610031, Chengdu, China;
2.China Communications Railway Design and Research Institute Co., Ltd., 100032, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20230787
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中图分类号/CLCN:U451
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栏目/Col:土建工程
摘要:
［目的］城市深埋软岩隧道围岩压力拱的成拱机理不清，变化规律不明，往往导致地下工程支护结构的设计过于保守，进而提高工程造价。为此，有必要进一步研究支护条件下的城市深埋软岩隧道压力拱特性。［方法］以重庆轨道交通18号线富华路站—歇台子站区间隧道为工程背景，采取数值模拟与室内模型试验相结合的方法，对50~500 m埋深支护条件下深埋软岩隧道压力拱的演化规律进行分析，研究支护条件下压力拱随埋深动态发展的趋势，并将数值计算结果与室内模型试验监测数据进行对比，验证数值模型计算结果的可靠性。［结果及结论］在50~500 m埋深支护条件下，洞周围岩应力状态处于围岩承载区和原岩应力区内。随着隧道埋深的增加，压力拱整体形状基本无变化，内边界未发展，外边界向外扩展67%~ 216%后基本趋于稳定。支护条件下，埋深对压力拱的动态发展影响有限。当埋深超过300 m后，压力拱范围基本不再变化。
Abstracts:
［Objective］ The arching mechanism and evolution law of the surrounding rock pressure arch in deep-buried urban soft rock tunnels remain unclear, often resulting in overly conservative design of underground support structures and increased project costs. Therefore, it is necessary to further study the characteristics of pressure arches in urban deep-buried soft rock tunnels under support conditions. ［Method］ Taking the tunnel interval between Fuhua Road Station and Xietaizi Station of Chongqing Rail Transit Line 18 as the engineering background, a combined approach of numerical simulation and laboratory model testing is employed to analyze the evolution law of pressure arches under support conditions at burial depths ranging from 50 to 500 meters. The dynamic development trend of pressure arch with increasing burial depth under support conditions is investigated. The results of numerical calculation are compared with laboratory model test monitoring data to verify the reliability of the numerical model calculation results. ［Result & Conclusion］ Under support conditions and burial depths of 50 to 500 meters, the stress state of the tunnel surrounding rock lies within the rock bearing zone and the original in-situ stress zone. The pressure arch overall shape remains largely unchanged with the increasing burial depth, and compared to the unexpanded inner boundary, the outer boundary expands outward by 6.7% to 21.6% before stabilizing. Under support conditions, the dynamic development of the pressure arch is only minimally affected by the burial depth. When the burial depth exceeds 300 meters, the extend of the pressure arch remains essentially unchanged.
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