R/S分析法在盾构下穿机场过程中的地表变形规律研究

为保证机场的正常运营,在盾构下穿机场的施工过程中,对地表沉降变形控制的要求较高,因此对穿越过程中的施工控制和变形规律研究具有重要意义。首先,基于盾构下穿机场的工程条件,分析盾构下穿过程中的风险,并提出相应的控制措施;同时,根据现场监测数据,分析盾构下穿机场过程中的地表沉降变形规律,并利用R/S分析法对地表沉降的发展趋势进行研究。结果表明:盾构施工引起的机场地表变形均在控制值范围以内,且各监测点在不同序列条件下的Hurst指数均大于0.5,具有沉降持续减弱的趋势,验证下穿过程中风险控制措施的有效性,为类似下穿机场的盾构施工提供一定的实践经验,也为盾构施工引起的地表沉降变形规律研究提供参考。

Study on Surface Deformation in Shield Tunneling under Airport Based on R/S analysis

To ensure the normal operation of the airport under which shield construction is in progress,it is very important to study the law of deformation and to control surface settlement deformation.This paper analyzes the risk in the process of tunneling based on engineering conditions and puts forward corresponding control measures.According to site monitoring data,it also analyzes the law of settlement deformation and its development tendency with R/S method.The results show that the surface deformation caused by shield construction is controlled within the limit,and the Hurst indexes measured in each and every monitoring point under different sequences are higher than 0.5,showing continued decline of settlement.The verification of the effectiveness of control measures in the process of construction provides practical experiences for similar projects and helps study the law of settlement deformation caused by shield construction.