Shahrood University of Technology Journal of Mining and Environment 2251-8592 13 3 2022 07 01 Experimental Investigation on Deformation Behavior of Circular Underground Opening in Hard Soil using a 3D Physical Model 727 749 2492 10.22044/jme.2022.12158.2213 EN Jinwei Fu School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China Mohammad Reza Safaei School of Civil Engineering, Aria University of Sciences and Sustainability, Tehran, Iran Hadi Haeri School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China Vahab Sarfarazi Department of mining engineering, Hamedan University of technology, Hamedan, Iran Mohammad Fatehi Marji Department of Mine Exploitation Engineering, Faculty of Mining and metallurgy, Institute of Engineering, Yazd University, Yazd, Iran Leige Xu School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China Ali Arefnia Department of Geotechnics & Transportation, Faculty of Civil Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia Journal Article 2022 07 30 In this work, the mechanical behavior of strata deformation due to drilling and surface loading is investigated using a 3D physical model. For this purpose, a scaled-down physical model is first designed. Then the tunnel drilling and support system are built. The subsidence experiments performed due to tunnel excavation and loading in a very dense and loose soil are performed. Soil is clayey sand (SC), and the percentages of its components are as sand (S = 1. 41%), gravel (G = 25%), and clay (C = 9.33%). Unstable tunnel support experiments are also carried out using physical simulation. Finally, deformations of soil surface and subsidence of strata are observed and recorded. In the tunnel with segmental support, 18.75% more load is applied than in the unsupported tunnel, and the total subsidence of the strata is reduced by 36.2%. The area of the deformed inner layers is decreased by 74.2%, and the length of the affected area in the largest layer is decreased by 48%. The depth of the cavity created at the surface is 46.66% less. https://jme.shahroodut.ac.ir/article_2492_0e051e440224b5dc41eb5ccfd361141c.pdf