Abstract：Research purposes： Fine adjustment of ballastless back has become one of the key technologies in control survey for ballastless track construction. In fine adjustment of ballastless track, the stability of CP Ⅲ points which are involved in resection should be detected before three-dimensional strict adjustment of the resection station, and then remove the unstable CP Ⅲ points. How to detect the stability of CP Ⅲ points and analyze the stability judgement method of CPⅢpoints as well as its feasibility, and also put forward some suitable judgement standards, so as to make sure the high precision of ballastless track laying.
Research conclusions: The paper proposes the method about the stability detection of Control Points m，which uses the information provided after the early CP Ⅲ plane and elevation control network adjustment and the measured distance and height difference of every two CP Ⅲ points calculated by measured data of free station in fine adjustment of ballastless track，and then compares with known distance and height difference. Theoretical analysis and testing results both validate that the method is correct and can detect the stability of CP Ⅲ points in plane and elevation. So the method proposed in the paper can be widely used in the project.
徐小左，刘成龙，杨友涛. 无砟轨道精调中CP Ⅲ 网点稳定性检测方法的研究[J]. 铁道工程学报, 2008, 25(9): 21-25.
XU Xiao-zuo, LIU Cheng-long,YANG You-tao. Research on the Detection Method of CP Ⅲ Points Stability in Fine Adjustment of Ballastless Track. 铁道工程学报, 2008, 25(9): 21-25.
2008, Vol. 25 
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