盾构穿越岩溶和土洞发育区地质安全施工技术研究  

Research on geological safety construction technology for shield tunneling through karst and soil cave development areas

作　　者：许阳阳 XU Yang-yang

机构地区：[1]中铁十九局集团轨道交通工程有限公司,北京101300

出　　处：《建筑机械》2024年第12期203-207,212,共6页Construction Machinery

摘　　要：地铁盾构掘进在穿越建筑群时,岩溶和土洞发育区是盾构掘进中极具挑战性的危险地质区域,需要在施工区间内采用物探手段进行探测。文章通过探讨盾构在穿越徐州地铁4号线此类危险地质时面临的技术难题,利用三维数值模拟分析确定盾构施工及隧道结构安全受影响的溶洞、土洞范围,勘测确定其类型及大小,并据此制定处治措施。介绍不同物探方法的原理、适用范围及优缺点,比选出最适合的穿越建筑物群岩溶和土洞发育区地层的物探技术,选择复杂环境下抗干扰能力强的微动探测技术来解决此类问题,通过微动反演视横波速度剖面对地下岩层波速结构特征进行分析。在分析该区间岩溶和土洞分布规律的基础上,提出了溶土洞处治措施,并通过盾构土仓压力变化情况验证溶土洞处治措施的合理性,结合地质钻探资料推测基岩界面、强风化松散地层及溶洞异常区,阐述采取地质勘察、施工风险分析、充填法、注浆法等安全控制技术,理论分析与实际案例结合提出1套有效的安全技术措施。This paper deeply studies the optimization scheme of the construction technology of shield disintegrating,and innovatively puts forward the novel technology and process of shield disintegrating through systematic theoretical analysis,fi ne parameter adjustment and successful engineering practice based on actual engineering cases.This research focuses on the technology of shell disassembly in the receiving process of shield machine,and specifically develops the receiving operation method of underground excavation suitable for complex geological environment and the dismantling strategy of shield machine tunnel.Practice verification shows that the scheme is not only safe,reliable,feasible,but also has strong adaptability and fl exibility.

关 键 词：盾构 岩溶 土洞 三维数值模拟 微动探测技术 地质勘察 安全技术 

分 类 号：U455.54[建筑科学—桥梁与隧道工程]