以宜巴高速公路峡口隧道为工程实例，针对高地应力软岩隧道施工大变形控制问题，运用数值分析分别采用环形开挖留核心土法、三台阶法、双侧壁导洞法和CRD法对峡口隧道大变形段典型断面进行开挖模拟，获得了4种不同施工工法下洞身变形、塑性区分布情况;并以此判断围岩的稳定情况，对4种施工工法的优劣进行分析与研究。研究结果表明CRD法对控制围岩稳定效果最好。最后结合工程实际，通过支护结构受力监测，洞周累计变形量与变形速率量测，验证了选用的施工工法及工艺的合理性，对我国高地应力软岩隧道的建设进行了有益的探索。
Abstract
To investigate the big deformation control for soft rock tunnel construction with high geostress, we simulated the excavation of typical sections with big deformation by numerical approaches. Xiakou tunnel of Yichang-Badong Highway was taken as a case study. We adopted four construction techniques(method of ring cutting while preserving core soil, three-step method, two-sided pilot-hole method and CRD method) in the excavation simulation. By analyzing the tunnel deformation and plastic zone distribution respectively of these four techniques, we determined the stability of the surrounding rock, and analysed the advantages and shortcomings of the four methods. Results show that CRD method works best in terms of rock stability control. Finally, we verified the rationality of the construction technique by monitoring forces on the supporting structure and measuring the cumulative deformation and deformation rate. This research is an exploration on China’s soft rock tunnel construction with high geostress.
关键词
高地应力 /
软岩隧道 /
施工工法 /
数值分析
Key words
high geostress /
soft rock tunnel /
construction method /
numerical analysis
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基金
三峡大学研究生创新基金资助项目(2013CX020)；三峡大学土木建筑学院培优基金项目(PY201413)
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