隧道洞口浅埋段地表沉降控制措施研究  

Study on surface settlement control measures of at the shallow buried section of tunnel entrance

作　　者：潘海祥 Pan Haixiang(Dehua County Road and Bridge Construction Co.,Ltd.,Dehua Fujian 362500,China;Dehua County Municipal Construction Engineering Co.,Ltd.,Dehua Fujian 362500,China;Dehua County Traffic Engineering Testing Co.,Ltd.,Dehua Fujian 362500,China)

机构地区：[1]德化县路桥建设有限公司,福建德化362500 [2]德化县市政建设工程有限责任公司,福建德化362500 [3]德化县交通工程检测有限公司,福建德化362500

出　　处：《山西建筑》2024年第24期156-159,共4页Shanxi Architecture

摘　　要：针对隧道浅埋段洞口地表失稳问题,探索了控制隧道洞口浅埋段地表沉降的有效措施。基于某隧道浅埋段洞口地表监测点的观测数据,从地表形貌、开挖方式、支护效果等方面综合分析了地表沉降过大和不均匀的原因,进一步提出了洞口段地表沉降控制措施相应的施工方案。采用数值模拟技术模拟了地表仰坡喷锚注浆加固,以及上下台阶预留核心土开挖等工况,进一步深入分析了地表偏压和沉降的变化,验证了洞口段地表沉降控制措施的有效性。研究结果表明,综合应用地表喷锚加固与上下台阶预留核心土开挖法可以显著减少地表沉降,有效控制了洞口偏压,同时塑性区面积显著减小。该研究可以为此类浅埋隧道洞口地表沉降控制措施提供参考。In light of tunnel entrance surface instability issues at the shallow buried section,this paper explores the effective measures to control the surface settlement at the shallow buried section of tunnel entrance.Based on the observation data of the surface monitoring point at the entrance of a shallow buried section of a tunnel,it comprehensively analyzes excessive and uneven surface settlement causes from aspects of surface topography,excavation method and support effect,etc.,and then proposes corresponding construction scheme of surface settlement control measures.Through applying numerical simulation technology,it simulates the construction conditions of surface upward slope grouting reinforcement,and up-down steps reserving core soil excavation,further analyzes the changes of surface bias pressure and settlement,and verifies the effectiveness of surface settlement control measures at the cave entrance section.The results show that the combined application of ground grouting anchor reinforcement and up-down steps reserving core soil excavation can significantly reduce the surface settlement,effectively control the hole bias pressure,and significantly reduce the plastic zone area.This study can provide reference for the surface settlement control measures at the entrance of similar shallow buried tunnels.

关 键 词：隧道开挖 隧道地表沉降 离散元模拟 围岩稳定性 

分 类 号：TU997[建筑科学—市政工程] U453.1[建筑科学—桥梁与隧道工程]