作者：韦超1，朱鸿鹄1,2，王家琛1，程刚1,3，吴涵1，王静1
1.南京大学 地球科学与工程学院，江苏 南京 210023
2.南京大学 大地探测与感知研究院，江苏 南京 210023
3.华北科技学院（中国煤矿安全技术培训中心），北京 101601
来源：防灾减灾工程学报, 2022, 42(5), 1085-1096.
摘要：掌握装配式综合管廊的螺栓节点在土体回填、加载、卸载等工况中所承受的应力变化，对于准确评价管廊施工和运营期的稳定性有着重要的作用。针对常规的监测手段难以满足综合管廊在施工及运营期间安全监测要求的瓶颈，基于开发的光纤光栅（FBG）智能螺栓应力计，对南京江北新区某综合管廊的建设过程进行原型试验研究。现场监测结果表明：FBG 螺栓应力计监测数据与管廊的连接位置、施工工况、堆载大小及位置等有关。在管廊上部堆载从0 增加至4000 kN的过程中，FBG 螺栓应力计测试数据处于安全阈值，表明其具有足够的螺栓预紧度；根据相关规范，螺栓所受的最大应力满足设计使用要求，保证了管廊结构的承载力处于安全范围。本研究充分验证了光纤传感技术在装配式综合管廊受力变形监测中的有效性，未来值得推广应用。
关键词：装配式综合管廊；光纤光栅（FBG）；光纤传感技术；螺栓应力；原型试验
Prototype Test Study on Loading Condition of Fiber-optic Smart Bolts of an
Assembled Utility Tunnel
WEI Chao1，ZHU Hong-hu1,2，WANG Jia-chen1，CHENG Gang1,3，WU Han1，WANG Jing1
(1.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China；2. Institute of Earth Exploration and Sensing, Nanjing University, Nanjing 210023, China; 3. North China Institute of Science and Technology (National Safety Training Center of Coal Mines), Beijing 101601, China)
Abstract: It is important to grasp the stress changes of the bolted joints of assembled utility tunnels during the working conditions of soil backfilling, loading, and unloading to accurately evaluate the stability of utility tunnel during construction and operation. In
response to the bottleneck that conventional monitoring methods can hardly meet the safety monitoring requirements of utility tunnel during construction and operation, this paper conducts a prototype experimental study on the construction process of the utility tunnel in Jiangbei New District, Nanjing, based on the developed fiber Bragg grating (FBG) bolt stress gauge. The field monitoring results show that the FBG bolt stress gauge monitoring data is related to the connection location, construction conditions, stacking load size, and location of the utility tunnel. In the process of increasing the stacking load from 0 to 4000 kN in the upper part of the utility tunnel, the FBG bolt stress gauge test data is at the safety threshold, indicating that it has sufficient bolt gauge pre-tightening; according to the relevant specifications, the maximum stress on the bolt gauge meets the design use requirements, ensuring that the bearing capacity of the utility tunnel structure is in the safe range. This study fully verifies the effectiveness of fiber optic sensing technology in monitoring the force deformation of assembled utility tunnels, which is worth promoting and applying in the future.
Key words: assembled utility tunnel; fiber Bragg grating (FBG); fiber optic sensing technology; bolt stress; prototype test
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