报告详情
Field Monitoring Study on Structural Mechanical Behavior of Large-Deformation Soft Rock Tunnels Supported by Energy-Absorbing Bolts
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更新：2025-07-21 15:59:00 浏览：18次
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摘要
In soft rock tunnels experiencing large deformations, conventional bolt support often leads to phenomena such as bolt fracture, concrete lining cracking, and steel arch distortion. In contrast, energy-absorbing bolts mitigate these issues by releasing the energy stored within the surrounding rock mass.To investigate the structural mechanical behavior of tunnels supported by energy-absorbing bolts, this study implemented a field monitoring program at the Longriba No. 3 Tunnel. Test sections employing energy-absorbing bolts and control sections using conventional bolts were established and monitored.
The findings indicate:(1) Energy-absorbing bolts significantly reduced surrounding rock deformation and structural loading, effectively controlling plastic zone development. Compared to the control section, deformation in the test section decreased by approximately 30%, rock-contact pressure and stress on the arch ribs decreased by about 25%, and bolt axial force decreased by approximately 25%.(2) Energy-absorbing bolts altered the load progression and pattern of the support structure:Early stage (0–20 d):Rock-contact pressure and arch rib stress increased over a longer duration in the test section (50% longer) compared to the control section.Mid-stage (20–40 d):The growth rate in the test section decelerated first. In contrast, the control section exhibited an initial acceleration followed by gradual deceleration.Late stage (>40 d):Loads on all support structures in both sections stabilized, but the loads in the test section remained lower.(3) Energy-absorbing bolts effectively reduced the "asymmetric phenomenon" in rock-contact pressure and arch rib stress.The rock-contact pressure asymmetry coefficient at the sidewalls decreased from 0.461 to 0.334 (a decrease of 37%).The rock-contact pressure asymmetry coefficient at the haunches decreased from 0.164 to 0.102 (a decrease of 28%).The arch rib stress asymmetry coefficient at the sidewalls decreased from 0.394 to 0.201 (a reduction of 49%).The arch rib stress asymmetry coefficient at the haunches decreased from 0.201 to 0.147 (a reduction of 26.9%).The research results deepen the understanding of the mechanical behavior of tunnel structure supported by energy-releasing bolts.
The findings indicate:(1) Energy-absorbing bolts significantly reduced surrounding rock deformation and structural loading, effectively controlling plastic zone development. Compared to the control section, deformation in the test section decreased by approximately 30%, rock-contact pressure and stress on the arch ribs decreased by about 25%, and bolt axial force decreased by approximately 25%.(2) Energy-absorbing bolts altered the load progression and pattern of the support structure:Early stage (0–20 d):Rock-contact pressure and arch rib stress increased over a longer duration in the test section (50% longer) compared to the control section.Mid-stage (20–40 d):The growth rate in the test section decelerated first. In contrast, the control section exhibited an initial acceleration followed by gradual deceleration.Late stage (>40 d):Loads on all support structures in both sections stabilized, but the loads in the test section remained lower.(3) Energy-absorbing bolts effectively reduced the "asymmetric phenomenon" in rock-contact pressure and arch rib stress.The rock-contact pressure asymmetry coefficient at the sidewalls decreased from 0.461 to 0.334 (a decrease of 37%).The rock-contact pressure asymmetry coefficient at the haunches decreased from 0.164 to 0.102 (a decrease of 28%).The arch rib stress asymmetry coefficient at the sidewalls decreased from 0.394 to 0.201 (a reduction of 49%).The arch rib stress asymmetry coefficient at the haunches decreased from 0.201 to 0.147 (a reduction of 26.9%).The research results deepen the understanding of the mechanical behavior of tunnel structure supported by energy-releasing bolts.
关键词
Large-Deformation,soft rock tunnel,Energy-Absorbing bolts
报告人
peiwen Yuan
postgraduate Chengdu university of technology稿件作者
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重要日期
-
会议日期
08月23日
2025
至08月26日
2025
-
07月29日 2025
初稿截稿日期
-
08月26日 2025
注册截止日期
主办单位
Southwest Jiaotong University, China (SWJTU)
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
承办单位
Southwest Jiaotong University, China (SWJTU)
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
联系方式
- Yufeng Wang
- wa******@swjtu.edu.cn
- +86********
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