某尾矿库排洪隧洞贯通误差预计方案探讨

Discussion on Project Prediction of Flood Discharge Tunnel’sThrough Error of one Tailings pond

该排洪隧洞是整个库区较为重要的防洪排水措施工程,工程成型质量有较高要求,有必要对该隧洞两对头掘进端进行统一系统的高精度测量。在正式的测量工作开始前,根据工程设计图纸编制贯通误差预计方案,方案首先对隧洞内外预布置测量控制点,然后以《工程测量规范GB50026—2007》为依据,达成贯通误差允许值为目标,选取并计算测量精度等级,进而推算出贯通位置可能出现的各方向上的最大偏差,同时给出结论,通过方案指导整个隧洞工程控制测量工作的实施,使最终隧洞贯通精度到达设计要求。

The flood discharge tunnel is the important flood control and drainage measures engineering in the whole reservoir area,it has higher requirements for engineering forming qualities,it’s necessary to make uniform,systematic high-precision measurements for two tunneling ends of the tunnel.The through error preset plan was established according to the engineering design drawings before the start of the formal measurement works,first the measurement control point is arranged inside and outside the tunnel,the measurement accuracy class is calculated and selected in order to achieve the allowance of through error according to the Code for Engineering Surveying GB50026-2007,and then the possible maximum deviation in all directions of through position can be calculated,and the conclusion can be made simultaneously,the plan provide guidance for implementation of the whole tunnel's engineering control survey work,so the final through precision of the tunnel can meet the design requirments.