Wu Di, Liang Taiming, Jiang Fan, Yang Yanxin, Pei Qingpeng, Wu Jianjian
School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin, 541004, China.
Natural Resources Ecological Restoration Center of Guangxi Zhuang Autonomous Region, Nanning, 530028, Guangxi, China.
Sci Rep. 2025 May 12;15(1):16468. doi: 10.1038/s41598-025-00821-w.
To address challenges in monitoring subsurface soil displacement in karst collapse areas, a MEMS-based spherical monitoring device was developed to accommodate complex subsurface monitoring environments. Six sets of fixed-distance tests were designed to verify the flexibility of the spherical monitoring devices in moving with the sub-surface soil. Furthermore, four indoor model tests were conducted to acquire displacement data, which were developed from MEMS sensors and MEMS sensors with spherical shell arranged at identical positions. PIV was employed to analyze the monitoring accuracy of the MEMS spherical monitoring device and MEMS sensor in karst collapse model tests, to further evaluate the practicality of the spherical monitoring devices for monitoring in karst collapse. The results of the fixed-distance tests indicate that the spherical monitoring device effectively mitigates the influence of soil pressure on the monitoring cables. Model test results show that, in comparison to MEMS sensor, the MEMS spherical monitoring device exhibits a reduced average relative error of 23.09% in stable zone displacement measurements and 18.87% in the subsidence zone. This suggests that the MEMS-based spherical monitoring device better captures variations in sub-surface soil displacement. This paper provides a new insight for karst collapse monitoring and the application of MEMS sensors in geotechnical engineering.
为应对岩溶塌陷地区地下土壤位移监测中的挑战，开发了一种基于微机电系统（MEMS）的球形监测装置，以适应复杂的地下监测环境。设计了六组定距测试，以验证球形监测装置随地下土壤移动的灵活性。此外，进行了四项室内模型试验以获取位移数据，这些试验由布置在相同位置的MEMS传感器和带球形外壳的MEMS传感器开展。在岩溶塌陷模型试验中采用粒子图像测速技术（PIV）分析MEMS球形监测装置和MEMS传感器的监测精度，以进一步评估球形监测装置在岩溶塌陷监测中的实用性。定距测试结果表明，球形监测装置有效减轻了土压力对监测电缆的影响。模型试验结果表明，与MEMS传感器相比 MEMS球形监测装置在稳定区位移测量中的平均相对误差降低了23.09%，在沉降区降低了18.87%。这表明基于MEMS的球形监测装置能更好地捕捉地下土壤位移变化。本文为岩溶塌陷监测及MEMS传感器在岩土工程中的应用提供了新的见解。
