大断面浅埋隧道地表沉降Peck修正公式及其应用
Modified Peck's Formula for Surface Settlement of Large-section Shallow-buried Tunnel and Its Application
马昭 1张明礼 2段旭晗 1赵博1
作者信息
- 1. 兰州理工大学土木工程学院,兰州 730050
- 2. 兰州理工大学土木工程学院,兰州 730050;兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州 730050
- 折叠
摘要
针对经典Peck公式未考虑隧道断面形状、埋深对大断面浅埋隧道地表沉降影响的不足,考虑断面形状与隧道埋深修正系数改进Peck公式.利用白塔山隧道地表沉降实测数据对修正公式进行验证,两个监测断面预测值与实测值平均相对误差8.3％,最大相对误差18.4％.进而采用修正Peck公式对不同断面形状、不同埋深隧道开挖引起的地表沉降进行预测.结果表明:地表最大沉降与断面形状修正系数成正相关,地表最大沉降依次为矩形-1(Ⅰ)＞马蹄形-1(Ⅱ)＞圆形(Ⅴ)＞矩形-2(Ⅲ)＞马蹄形-2(Ⅳ);随着大断面浅埋隧道埋深增加,地表最大沉降减小而地表沉降槽宽度相应增大.地表沉降曲线形态由窄而深过渡到宽而浅,地表核心沉降区面积也逐渐减小.研究成果可为类似工程提供理论支持和技术参考.
Abstract
The classical Peck's formula fails to account for the impact of tunnel's section shape and buried depth on surface settlement in shallow-buried tunnels with large section.To address this limitation,we introduced a modi-fied Peck's formula by incorporating correction coefficients for sectional shape and buried depth,and verified the validity of the modified formula using measured surface settlement data of the Baitashan Tunnel.The average rela-tive error between predicted and measured values for two monitoring sections is 8.3％,with a maximum relative er-ror of 18.4％.Additionally,we employed the modified Peck's formula to predict surface settlement resulting from tunnel excavation under various sectional shapes and buried depths.The results demonstrate a positive correlation between the maximum surface settlement and the sectional shape correction coefficient,with the following order of maximum surface settlement predicted:rectangle-1(Ⅰ)＞horseshoe-1(Ⅱ)＞circle(Ⅴ)＞rectangle-2(Ⅲ)＞horseshoe-2(Ⅳ).As the burial depth of the large-section shallow-buried tunnel increases,the maximum surface settlement decreases,and the width of surface settlement groove correspondingly widens.The surface settlement curve transitions from being narrow and deep to wide and shallow,while the area of core settlement gradually dimin-ishes.The outcomes presented in this study provide theoretical support and serve as a technical reference for similar projects.
关键词
大断面浅埋隧道/地表沉降预测/Peck修正公式/断面形状Key words
shallow-buried tunnel with large section/surface settlement prediction/Peck's correction formula/sectional shape引用本文复制引用
基金项目
中国科学院"西部青年学者"项目(23JR6KA027)
陇原青年创新创业人才(个人)项目(2023LQGR18)
甘肃省住房和城乡建设厅建设科技项目(JK2021-49)
甘肃省高等学校产业支撑计划项目(2020C-40)
甘肃省基础研究创新群体项目(20JR5RA478)
出版年
2024
国家科技期刊平台
NSTL
万方数据