基于三维重构的隧道围岩稳定性快速分析及动态反馈
发布时间：2018-08-03 19:40
【摘要】：节理的存在降低了岩体的完整性和连续性,对隧道围岩的稳定具有重要影响,若支护不及时或强度不够将会严重威胁施工安全。本文依托井冈山特长隧道,提出了基于三维重构、块体理论的隧道围岩稳定性快速分析方法,动态反馈、指导设计施工方案优化。针对中风化砂岩、Ⅳ级围岩区段,通过地质素描与统计分析,建立基于节理特征的三维重构地层模型;运用块体理论,分析隧道开挖时临空面关键块体分布、失稳形式及安全系数;提出围岩稳定性动态反馈方法,并对比分析不同支护方案。研究表明:开挖后围岩稳定性较差,必须采取相应的支护措施,根据动态反馈明确在实际施工时必须严格按照原设计方案施作锚杆支护。基于三维重构的围岩稳定性快速分析及动态反馈,可以实现施工过程中地质数据的动态采集、分析与反馈,及时依据实际开挖地层条件,动态调整支护体系,确保结构的经济安全性。
[Abstract]:The existence of joints reduces the integrity and continuity of rock mass, and has an important effect on the stability of surrounding rock. If the support is not timely or the strength is not enough, the construction safety will be seriously threatened. Based on the Jinggangshan extra long tunnel, this paper puts forward a fast analysis method of surrounding rock stability based on 3D reconstruction and block theory, dynamic feedback to guide the optimization of design and construction scheme. Based on geological sketch and statistical analysis, a three-dimensional reconstruction stratigraphic model based on joint characteristics is established for the middle weathered sandstone and grade 鈪，
本文编号：2162803
[Abstract]:The existence of joints reduces the integrity and continuity of rock mass, and has an important effect on the stability of surrounding rock. If the support is not timely or the strength is not enough, the construction safety will be seriously threatened. Based on the Jinggangshan extra long tunnel, this paper puts forward a fast analysis method of surrounding rock stability based on 3D reconstruction and block theory, dynamic feedback to guide the optimization of design and construction scheme. Based on geological sketch and statistical analysis, a three-dimensional reconstruction stratigraphic model based on joint characteristics is established for the middle weathered sandstone and grade 鈪，
本文编号：2162803
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