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| CALCULATION METHOD FOR CREEP DEFORMATION OF AXISYMMETRIC ROUND WELL WITH CHANGING SUPPORT FORCE |
| HOU Gongyu1，LI Jingjing1，YANG Yue1，2，WANG Yaxiao1，LI Qingwei1，LIANG Yonghui1 |
(1. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；
2. School of Civil Engineering，Heilongjiang College of Technology，Harbin，Heilongjiang 150027，China) |
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Abstract In order to find a creep solution which can reflect continuous changes of passive support force for axisymmetric round well，an iterative algorithm based on the creep solution of constant passive support force was raised by taking the continuous changes of creep deformation of surrounding rocks into account. The algorithm which shows the changing process of passive support force was already used to calculate the creep deformation of surrounding rock. Result indicates that creep deformation of surrounding rocks is sensitive to the value of initial stress. Under certain support stiffness，the increasing rate of support force is sensitive to the value of initial stress. Support force has little effects on the control of surrounding rocks creep deformation in condition of large in-situ stress.
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Received: 25 November 2012
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2014, Vol. 33 
