| 浅埋软岩隧道拱顶下沉预测及二衬合理支护时机 |
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| 引用本文： | 李广瑞,朱自强,鲁光银.浅埋软岩隧道拱顶下沉预测及二衬合理支护时机[J].中南公路工程,2013(5):44-46,71. |
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| 作者姓名： | 李广瑞 朱自强 鲁光银 |
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| 作者单位： | 中南大学信息物理工程学院,湖南长沙410083 |
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| 基金项目： | 国家自然科学基金项目资助（41174061）;中南大学自由探索计划资助（2011QNZT011） |
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| 摘 要： | 考虑浅埋软岩隧道随掌子面推进距离及围岩弹塑性、流变特性引起的拱顶下沉,再加上掌子面开挖前的拱顶下沉量,推算出拱顶下沉函数的经验计算公式.利用非线性最小二乘拟合对现场数据进行计算,得到拱顶下沉预测总量,依据规范得出浅埋软岩隧道二衬的合理支护时间.
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| 关 键 词： | 浅埋软岩隧道 拱顶下沉 流变 前期沉降 二衬支护时机 |
Prediction of Vault Crown Settlement in Shallow Buried and Soft Rock Tunnel and Surpporting Time of The Second Lining Construction |
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| LI Guangrui;ZHU Zhiqiang;LU Guangyin.Prediction of Vault Crown Settlement in Shallow Buried and Soft Rock Tunnel and Surpporting Time of The Second Lining Construction[J].Central South Highway Engineering,2013(5):44-46,71. |
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| Authors: | LI Guangrui;ZHU Zhiqiang;LU Guangyin |
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| Institution: | LI Guangrui;ZHU Zhiqiang;LU Guangyin(School of Geosciences and Info-Physics, Central South University, Changsha, Hunan 410083, China) |
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| Abstract: | In combining with the vault crown settlement in shallow buried and soft rock tunnel caused by the property of elasto-plastic and rheology of tunnel surrounding rocks,and distance between excavated face and monitoring section,and the amount of subsidence in the front of excavated face,we calculate the empirical formula of vault crown settlement.In order to deduce the other variable of the formula,the fitting method of nonlinear least square is adopted in data processing.The total amount of subsidence can be calculated when time and distance tend to be infinity in the formula.We can suggest the criterion for second lining construction in time in shallow buried and soft rock tunnel on the basis of code for design of road tunnel. |
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| Keywords: | shallow buried and soft rock tunnel vault crown settlement rheological properties subsidence in the front of excavated face second lining construction in time |
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