大两井定向测量在长大盾构隧道中的应用研究

Application of Directional Survey of Daliang Well in Long Shield Tunnel

联系测量和洞内导线测量在地铁长大盾构隧道顺利贯通过程中起着重要作用。以广州市轨道交通21号线某长大隧道为研究对彖,当隧道掘进至1600m处时,隧道采用两井定向和大两井定向两种联系测量方案进行坐标传递和洞内导线测量,通过对两种方案下始发基线、洞内控制点、陀螺定向边方位角、环片姿态、隧道贯通测量成果进行比对分析。结果表明,大两井定向联系测量能较好适用于地铁长大盾构隧道测量工作,指导隧道顺利施工。

Contact survey and traverse survey in tunnel play an important role in the smooth running through process of long shield tunnel.Taking a long and long tunnel of Guangzhou rail transit line 21 as the research object,when the tunnel is driven to 1600m,two connection measurement schemes of two well orientation and big two well orientation are adopted for coordinate transmission and tunnel traverse measurement.Through the comparison and analysis of the starting baseline,control point in the tunnel,gyro orientation side azimuth,ring attitude and tunnel penetration measurement results under the two schemes.The results show that:the directional contact survey of Daliang well is suitable for the measurement of long and long shield tunnel of Metro and guide the smooth construction of tunnel.