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| Zonal disintegration of surrounding rock in deep underground cave based on force analysis of rock bolts |
| YU Yuanxiang，CHEN Baoping，WANG Fuyu，WANG Jingbin，KE Da |
| (School of Architecture and Civil Engineering，Xi′an University of Science and Technology，Xi′an，Shaanxi 710054，China) |
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Abstract Determining the thickness and number of fractured zones in surrounding rock is important for excavation and supporting of cave at deep underground. A new approach to analyze the zonal disintegration of surrounding rock was put forward according to the periodical characteristic of tension-compression stress along the bolt length. A mechanical model of interaction between the full-size grouted bolt and surrounding rock was established based on deformation compatibility. The neutral point on the bolt and the formulas of maximum axial force were deduced. The range of plastic area in every zone in the surrounding rock was analyzed. The mechanical criterion about the tensile rupture of the surrounding rock on elastic-plastic interface after stress redistribution was proposed based on the Griffith?s strength theory. Then，the number of fractured zones in the surrounding rock was determined. The results show that the stress of the surrounding rock is redistributed after excavation. Under the condition of the maximum circumferential stress，radial tensile rupture happens on the elastic-plastic interface of surrounding rock when the tensile stress is greater than its ultimate tensile strength and the multiple fractured zones and non-fractured zones occur alternately. The displacement rate of rock within the fractured zone is different from that of non-fractured zone along the radial direction，leading to multiple neutral points along the bolt length. The thickness of the fracture zones in surrounding rock based on the back analysis of the radius of each neutral point shows a decreasing trend on the whole until the rupture of the surrounding rock stops. Finally，the above results were confirmed in a real engineering project.
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2018, Vol. 37 
