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针对盾构下穿建筑物时无法对沉降缝进行二维连续变形监测的技术难题,提出了基于长标距光纤光栅传感器交叉布设进行沉降缝实时、高精度二维变形监测思路.通过严密的理论推导获得了长标距传感器的应变值与沉降缝变形值之间的数学关系.利用简易装置理论推导进行了试验验证,误差很小,满足监测精度的要求.最后将该技术应用于某地铁盾构下穿施工的水库结构沉降缝监测之中,有效指导了施工,表明这种方法可靠实用.
Aiming at the technical problem that two-dimensional continuous deformation monitoring of settlement joint can not be carried out when the shield passes under the building, a real-time and high-precision two-dimensional deformation monitoring method of settlement joint based on crossing long FBG sensor is proposed. Through rigorous theory The mathematical relationship between the strain of long gauge sensor and the deformation value of settlement joint was deduced.The experimental verification was carried out by using simple device theory with little error to meet the requirement of monitoring accuracy.Finally, this technique was applied to a subway shield Under the monitoring of the settlement structure of the reservoir structure under construction, the construction is effectively instructed, which shows that the method is reliable and practical.