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| 基于皮尔逊系数的黄土隧道预留变形量预测 |
| Prediction of Reserved Deformation in Loess Tunnel Based on Pearson Coefficient |
| 投稿时间：2023-10-11 修订日期：2024-01-02 |
| DOI： |
| 中文关键词: 黄土隧道 预留变形量 拱顶下沉 周边收敛 统计分析 皮尔逊相关系数 |
| 英文关键词: Loess tunnel Reserved deformation The vault sinks Peripheral convergence Statistical analysis Pearson correlation coefficient |
| 基金项目:陕西省2020年重点研发计划(2020SF-428) |
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| 中文摘要: |
| 为了黄土地区隧道安全建设，因此合理的预测预留变形量成为一个重要环节。通过对不同黄土土质类型隧道的148个监测断面的整理分析，得到黄土隧道预留变形量合理设计的建议值。结果表明：(1)通过采用皮尔逊相关系数分析，其中土质类型对拱顶沉降影响相关性最强，埋深最弱；(2)在Ⅳ级围岩黄土隧道区段内，土质为黏质黄土和粉质黄土的隧道区段内预留变形量可设置为15cm以内，砂质黄土可设置为15-20cm；(3)在V级围岩黄土隧道区段内,土质为黏质黄土的隧道区段内预留变形量可设置为15-20cm，粉质黄土可设置为15cm以内，砂质黄土可设置为35-47.5cm；(4)拱顶累计下沉量分布在含水率为11%-23%之间的比例较高，且砂质黄土区段内隧道拱顶沉降受到含水率的影响要大于黏质黄土和粉质黄土区段内隧道；(5)不同埋深的影响下，预留变形量设置为16cm时，保证率可达到84.6%，但隧道埋深与拱顶沉降受到离散型影响。 |
| 英文摘要: |
| For the safety construction of tunnel in loess area, reasonable prediction of reserved deformation becomes an important link. Through the analysis of 148 monitoring sections of tunnels of different loess types, the recommended values for reasonable design of deformation allowance of loess tunnels are obtained. The results show that: (1) Through Pearson correlation coefficient analysis, the soil type has the strongest correlation with the settlement of the vault and the weakest buried depth; (2) In the tunnel section of grade IV surrounding rock loess, the deformation allowance of the tunnel section with clayey loess and silty loess can be set to within 15cm and sandy loess to 15-20cm. (3) In the V-grade surrounding rock loess tunnel section, the deformation allowance in the tunnel section with clayey loess can be set at 15-20cm, silty loess can be set within 15cm and sandy loess can be set at 35-47.5cm. (4) The distribution of accumulated settlement of arch crown is relatively high between 11% and 23% of water content, and the influence of water content on tunnel crown settlement in sandy loess section is greater than that in clayey loess and silty loess section. (5) Under the influence of different burial depths, the guaranteed rate can reach 84.6% when the deformation allowance is set at 16 cm, but the buried depth and the settlement of the arch are affected by discrete type. |
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