大浞河铁矿软岩巷道围岩蠕变的黏弹性参数反演

大浞河铁矿1采区-140 m水平采场进路开挖后，部分巷道围岩随时间推移持续向内收缩，显现出蠕变特性，对正常的生产经营造成了一定安全隐患。为探明巷道围岩变形机理，在一采区中段采场进路巷道进行原位试验，利用圆形巷道测试数据曲线的特点，选取合适的蠕变模型。根据黏弹性蠕变位移公式，借助Origin分析推导出模型所需要的参数。通过增减FLAC3D内置模型的参数项，修改内置蠕变模型的流变特性，使之符合巷道蠕变试验实测曲线的变化规律。利用圆形巷道实测曲线反演的蠕变参数对巷道围岩的顶板、底板、帮的蠕变变形进行模拟，并对三者的位移进行比较分析。分析结果表明：三者的位移曲线曲率相近，取得的数据具有一定价值，采用此种方法进行反推黏性参数，对圆形巷道的围岩蠕变分析具有一定的推广价值。

Viscoelastic Parameters Inversion of Surrounding Rock Creep of Soft Rock Roadway in Dazhuohe Iron Mine

When the stope route in-140 m level of No. 1 mining area in Dazhuohe Iron Mine has been excavated,part of the roadway surrounding rock is continuously contracted inward and characterized by creep property,which caused certain secu-rity hidden danger to the normal production and management of the mine. In order to analyze the deformation mechanism of roadway surrounding rock,the situ test is conducted in stope route roadway in the middle section of No. 1 mining area,the suit-able creep model is selected based on the test data curve characteristics of circular roadway. According to the viscoelastic creep displacement formula,the parameters required by the model are deduced by adopting Origin software. The rheological behavior of the built-in creep model is modified by increasing or decreasing the parameters of the built-in model in FLAC3D software,so as to conform to the variation regularity of the measured curve obtained by roadway creep test. The creep deformations of roof, floor and both sides of roadway surrounding rock are simulated and analyzed based on the creep parameters obtained by the e-volution of the measured curve of circular roadway,and the comparison and analysis of them are conducted. The study results show that the displacement curves of them are similar with each other,which further indicated that the obtained data of this pa-per has certain value,and the creep deformation analysis of circular roadway surrounding rock can be done effectively by the e-volution of viscoelastic parameters based on the method proposed in this paper.