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RISS 인기검색어
- 검색키워드
- 저자 : Yaqiang Gong (검색결과 3 건)
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Guojian Zhang,Guangli Guo,Yaqiang Gong,Anliang Xiao,Tonglong Zhao,Huaizhan Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.8
Deep mining puts forward higher requirements for the existing similar material simulation methods and monitoring techniques. The idea of superimposed similar material simulation is proposed to study the motion mechanism of high-stand and giant-thickness weak cementation sandstone, and its motion law is observed by the new method of single-binocular close-range photogrammetry, and verified by numerical simulation method. The results show that: first, the measurement accuracy of single close-range photogrammetry reaches the sub-millimeter level, with its medium errors of 0.18 mm and 0.17 mm in left and right camera respectively. Second, during the damage process of the thick weak cementation strata, the secondary equilibrium structure and regenerative equilibrium structure are formed, causing the destruction mode to go through four stages of ‘arch shell-beam-arch shell-step’ type damage. After the ‘arch shell-beam’ type destruction of the thick Zhidan group sandstone, its movement process disappears in the temporal correlation and shows the characteristics of the surface subsiding immediately after mining. Last, the surface subsidence develops with the saltation, and there is a quadratic polynomial function between the surface subsidence coefficient and the width-depth ratio. The above results can be used to guide the safety mining under the giant-thick weak cementation overburden.
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Qiu Du,Guangli Guo,Huaizhan Li,Yaqiang Gong,Tao Wei 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
The Stability analysis of datum points is a fundamental procedure to verify the monitoring results of leveling settlement. Traditional methods tend to be the employment of repeated monitoring or the increase in measurement points under the same monitoring technique, which are costly and complicated in data processing, making them difficult to be applied in common ground subsidence monitoring scenarios. In view of this, inspired by the idea of external validation, this paper proposes an evaluation method of the stability of datum points in leveling Observation based on Small Baseline Subset InSAR (SBAS-InSAR) technology. Firstly, the paper indicates that differences of subsidence measured by SBAS-InSAR and ground leveling of the same location respectively within close proximity are primarily composed of error caused by unconformity of the position, observation time and measurement method error as well as the displacement of datum points. Based on that, the formulas of calculating errors of unconformity of observation time and the displacement of datum points are derived separately. Afterwards, taking the monitoring of surface subsidence caused by the mining of two working faces in Yingpanhao Coal Mine located in northern Ordos Basin, as practical applications, the feasibility of the method proposed in the paper is verified. And the scope of application of the proposed method is also suggested. This study provides an efficient and economical solution for evaluating the stability of datum points in leveling settlement monitoring, promoting the joint combination of SBAS-InSAR technology and traditional leveling when applied to surface subsidence monitoring.
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Monitoring Sluice Health in Vibration by Monocular Digital Photography and a Measurement Robot
Guojian Zhang,Chengxin Yu,Guangli Guo,Long Li,Yongqian Zhao,Huaizhan Li,Yaqiang Gong 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6
This study uses monocular digital photography and a measurement robot (MDP&MR) to monitor the sluice vibration deformation in the gate lift test and in the sluicing test. The photographing scale transformation and time baseline parallax (PST-TBP) method is proposed in the field of monocular digital photography. Results show that the PST-TBP method improves measurement accuracy slightly. Measurement accuracies on the reference plane were 0.62 pixels (0.40 mm), 0.76 pixels (0.49 mm), and 1.10 pixels (0.71 mm) in the X, Z, and comprehensive-directions, respectively. The PST-TBP method overcomes the limitation that the photographing direction must be perpendicular to the sluice plane when monocular digital photography is used to monitor the sluice. MDP&MR proves an effective method in monitoring the sluice vibration deformation as MDP can be used to monitor the trend of the sluice vibration deformation and the MR allows high-accuracy monitoring of the short periodic deformation of the sluice. They have complementary advantages to achieve better results. Thus, MDP&MR can provide a new way to assess sluice health in vibration.
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