Calculation Method of Deformation Load of Deep-Buried Tunnel under Influence of Excavation Method
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摘要: 为了研究开挖方法对围岩形变压力的影响，采用理论分析、文献调研及现场测试方法明确了其对围岩形变压力的影响规律；根据相应变化规律，基于多元非线性回归方法，考虑围岩级别、隧道跨度及隧道开挖方法因素建立了围岩形变压力定量计算公式；对54座隧道的205个实测形变压力断面数据（108个大型机械化配套大断面开挖施工监测断面、97个常规分部开挖施工监测断面）进行分析.结果表明：采用大型机械化大断面开挖方法，隧道开挖后围岩稳定，所产生的围岩形变压力小；采用常规机械化分部法开挖方法，所产生的围岩形变压力大；围岩形变压力计算公式中开挖方法影响系数kc的取值范围为1.00～1.15，且围岩级别越大，kc取值越大，开挖方法对围岩所产生形变压力的影响越明显.Abstract: In order to study the influence of the excavation method on the deformation load of the surrounding rock, the law of its influence on the deformation load was clarified through theoretical analysis, literature research and field test methods. Considering the influence of surrounding rock grade, tunnel span and excavation method, a quantitative calculation formula for deformation load was established according to the corresponding change law based on the multiple nonlinear regression method. Through the analysis of the deformation load data of 205 monitoring sections in 54 tunnels (108 monitoring sections of large-scale excavation mechanized construction and 97 conventional partial excavation construction monitoring sections). The results show that the surrounding rock after tunnel excavation is stable and the deformation load of surrounding rock is small by adopting large-scale mechanized large-section excavation method. The deformation load of surrounding rock is large when the conventional mechanized subsection excavation method is adopted. In the calculation formula of deformation load of surrounding rock, the value of excavation method influence coefficient kc ranges from 1.00 to 1.15, the higher the grade of surrounding rock, the greater the kc value, that is, the worse the surrounding rock, the more obvious the influence of excavation methods on the deformation load of surrounding rock.
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Key words:
- excavation method /
- deep buried tunnel /
- deformation load /
- field measurement
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图 2 塑性区随围岩力学参数及支护力的变化规律
Figure 2. Variation of plastic zone with mechanical parameters and supporting force of surrounding rock
图 7 月进度增量百分比区间所含工区数量百分比
Figure 7. Quantity percentage of works areas in incremental percentage interval of monthly progress
图 8 深埋隧道形变压力计算图示
Figure 8. Calculation diagram of deformation load of deep buried tunnel
表 1 各级围岩的综合月进度建议取值（双线隧道）
Table 1. Recommended value of comprehensive monthly progress
m 开挖方法 围岩级别 Ⅱ级 Ⅲ级 Ⅳ级 Ⅴ级 常规机械化 140～200 100～130 55～80 35～50 大型机械化 150 138 82 55 
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表 2 不同年份的形变压力样本数及平均值
Table 2. Sample number and mean deformation load under different time
年份/年 形变压力样本数/个 形变压力平均值/kPa 年份/年 形变压力样本数/个 形变压力平均值/kPa 2001 14 123 2010 35 129 2002 0 0 2011 0 0 2003 0 0 2012 0 0 2004 0 0 2013 35 150 2005 20 196 2014 40 99 2006 14 205 2015 95 127 2007 60 116 2016 0 0 2008 0 0 2017 0 0 2009年 38 204 2018 135 49
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表 3 不同围岩等级下的kc
Table 3. kc under different surrounding rock grades
施工水平 Ⅲ级 Ⅳ级 Ⅴ级 大型机械化大断面开挖施工 1.00 1.00 1.00 常规机械化分部开挖施工 1.00 1.10 1.15
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