Research Of Settlement Observation And Assessment For Construction Projects Under Ballastless Track

There is a direct correlation between the collection of settlement observation data of the construction projects under passenger dedicated lines and the effectiveness of the settlement assessment, while the accuracy of the settlement assessment method is related to the reasonableness of the settlement prediction after construction. Therefore, it makes sense to verify the reliability of the settlement observation and research techniques of the settlement assessment for the construction projects under passenger dedicated lines.This thesis elaborates the domestic present situation of settlement observation and assessment for the construction projects under passenger dedicated lines. Based on the experience of the observation and assessment for the construction projects under Cheng-Mian-Le passenger dedicated lines, we summarize the scheme of settlement observation, the measurement level and precision requirement aiming at the settlement feature of "small quantities, large fluctuations". In the light of the settlement observation scheme of Cheng-Mian-Le passenger dedicated lines, we verify the reliability of the existing observation method. For the settlement points which can not fit the method of curvilinear regression, we introduce a new settlement assessment method--statistical hypothesis testing, also interpret its computation process and verify its adaptability of settlement assessment.To sum up, the main content and the research results of this thesis are as follows:(1)Summarize the domestic research present situation and technical requirement of settlement observation and assessment for the construction projects under passenger dedicated lines.(2)In this thesis, we discuss and test the necessity of the" five fixations" principle, according to the existing settlement observation data of Cheng-Mian-Le passenger dedicated lines, summarize the scheme of settlement observation, the measurement level and precision requirement for the construction projects under passenger dedicated line.(3)Based on the existing settlement assessment data of Cheng-Mian-Le passenger dedicated lines, we debate whether four common assessment methods are suitable for settlement assessment of the Cheng-Mian-Le passenger dedicated lines. We comparative and analyze the most suitable settlement assessment method for Cheng-Mian-Le passenger dedicated lines.(4)For the settlement points which can not fit the method of curvilinear regression, we introduce a new settlement assessment method--statistical hypothesis testing, also interpret its computation process and verify its adaptability of settlement assessment.