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沉降观测期的合理控制是涉及工程质量、进度与造价的关键技术难题。结合武广铁路客运专线路基沉降实测数据,对路基沉降特征进行了深入研究。根据沉降的发展趋势,将沉降时间曲线可分为3种类型,并提出了相应的观测期控制标准。第Ⅰ类,路基填筑完成6个月内沉降已基本趋于稳定,沉降时程曲线表现为较平滑、规律的收敛曲线,对于该类观测数据,沉降观测期可适当缩短。第Ⅱ类,路基填筑完成后,沉降快速趋于稳定,却在中途出现突然增长,而后又逐步趋于稳定,对于该类观测数据,应在沉降突变后继续观测不少于2~3个月,待沉降稳定后,方能进行评估。第Ⅲ类,路基填筑完成后,沉降继续发展,沉降速率未明显减小,未见稳定趋势,该类观测断面应引起观测单位和建设单位的重视,延长观测期,必要时采取工程处理措施。
The reasonable control of subsidence observation period is a key technical problem involving the project quality, progress and cost. Combined with the measured subgrade settlement data of Wu-Guang Railway Passenger Dedicated Line, the settlement characteristics of the subgrade are studied in depth. According to the trend of settlement, the settlement time curves can be divided into three types, and the corresponding control standards for observation period are proposed. In the first category, the subsidence within 6 months after the embankment filling has basically stabilized, and the settlement time history curve shows a smoother and regular convergence curve. For this kind of observation data, the subsidence observation period may be appropriately shortened. After the completion of subgrade filling, the subsidence rapidly stabilized but suddenly increased midway, and then stabilized gradually. For such observation data, the subsidence should continue to be observed after the subsidence of no less than 2 or 3 Month, to be settled after the settlement, before being able to assess. After the completion of subgrade filling, the subsidence continued to develop and the settlement rate did not decrease obviously. No stable trend was observed. Observation sections and construction units should pay attention to such observation sections, extend the observation period and adopt engineering measures when necessary .