A new device for monitoring sub-surface settlement in deep soil layers has been developed to address the shortcomings of limited measurement points, small measurement ranges, large errors, and low automation. The new device consists of anchoring unit, measuring unit and data acquisition unit. It is installed in sections into the monitoring soil layer through drilling. A new type of anchoring head driven by hydraulic pressure and spring is set at the upper and lower interfaces of the monitoring layer. A displacement meter and displacement transmission rod are connected in series between the upper and lower anchoring heads, and the lowest anchoring head is located in the stable stratum. Through layered measurement and layer-by-layer accumulation, the compression of each monitoring layer and the settlement of subsoil can be obtained, so as to realize multi-point, large-scale, high-precision and automatic monitoring of the same vertical direction in the stratum, which provides a new method for sub-surface settlement monitoring of deep soil layers. The performance testing and practical application results show that the new device has good coordination with the surrounding soil deformation, with high measuring precision, good data stability and continuity. It is suitable for layered settlement monitoring of fine-grained soil layers above groundwater level.
Sun Mo
,
Yu Yongtang
,
Ma Bo
,
Han Wenbin
,
Cao Jingyuan
. Development of A New Monitoring Device for Sub-Surface Settlement in Deep Soil Layer[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S1)
: 350
-357
.
DOI: 10.20174/j.JUSE.2024.S1.42
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