The pile of ramp passes through soil layer near the existing subway engineering structure. For closely constructing, it inevitably leads to adverse effects on the subway structure. In order to clarify the dynamic changes of subway structure and the surrounding stratum in the process of pile construction, and provide the technological data for design and construction, the research of stability deformation monitoring for Dashi-Hanxi Tunnel is performed. It expresses mainly the method adopted for monitoring the ground settlement on the tunnel, horizontal displacement of soil around the tunnel, deformation of tunnel itself, and analyzes the data of deformation changing with time. The research results show that during the time of pile drilling and concrete pouring into the soil, the ground subsidence and horizontal displacement of soil are unstable, but the deformation of tunnel itself is relatively stable;overall, all deformation values are less than the alarm value, which indicates that the project construction and monitoring methods are feasible.%匝道桩基穿越既有地铁工程结构附近土层，近距离施工不可避免地对地铁结构产生不利影响。为了解匝道基础工程施工阶段地铁结构及周边地层变化动态，给同类其他工程提供设计和施工依据。对大石—汉溪区间隧道进行了稳定性变形监测。主要阐述该隧道地面沉降、隧道周围土层水平位移和隧道结构及附近土层变形测试方法，变形随时间变化的量测数据及分析。结果表明：桩基钻挖成孔和灌注混凝土时，地面沉降和土层水平位移均不稳定，而隧道结构变形相对稳定；各变形值没有超过报警值，说明该工程采用的施工及监测方法是可行的，对其他同类工程具有借鉴意义。
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