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- 저자 : Anliang Xiao (검색결과 1 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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