| 矿山采动卸荷岩体力学参数劣化规律研究 |
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| 引用本文： | 胡建华,雷涛,罗先伟,周科平,张超兰.矿山采动卸荷岩体力学参数劣化规律研究[J].岩土力学,2012,33(4):1123-1128. |
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| 作者姓名： | 胡建华 雷涛 罗先伟 周科平 张超兰 |
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| 作者单位： | 中南大学 资源与安全工程学院 湖南省深部金属矿开发与灾害控制重点实验室，长沙 410083 |
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| 基金项目： | 国家十一五科技支撑计划(No.2006BAB02A02);湖南省自然科学基金资助项目(No.09JJ4025);国家自然科学基金资助项目(No.51074178);国家自然科学基金重点资助项目(No.50934006);中南大学自由探索计划资助项目(2011QNZT087) |
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| 摘 要： | 矿山开采对采动影响区域内的围岩形成扰动，弱化岩体力学性质，其参数劣化规律是数值模拟与分析计算的主要问题之一。以铜坑矿92#矿体连续采矿顶板诱导崩落试验采场为对象，运用卸荷岩体力学理论，确立了开挖卸荷岩体力学参数计算模拟的计算流程。结合有限元数值模拟方法，建立了岩体卸荷等效模型，进行了6步连续卸荷的计算，得到了地下连续采矿顶板卸荷岩体力学参数的变化规律，并运用多项式实现了卸荷岩体力学参数与卸荷量变化值的函数拟合，获得了采动卸荷岩体力学参数的劣化规律。结果显示，卸荷第6步时，计算不收敛，表明此时顶板已经完全破坏而发生崩落；在卸荷过程中，岩体力学参数均呈逐渐弱化的趋势，其中内摩擦角、凝聚力和弹性模量随开挖卸荷的推进呈逐渐减小的趋势，最终的参数分别相当于初始值的55%、50%和50%，但泊松比呈逐渐增大的趋势，最终值相当于初始值的1.15倍。其结果说明了采动卸荷导致了岩体质量的劣化，卸荷岩体力学参数与卸荷量的函数为采动卸荷力学响应的动态分析提供了理论基础。
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| 关 键 词： | 连续采矿 卸荷岩体力学 力学参数 卸荷等效模型 |
| 收稿时间： | 2010-10-09 |
Study of mechanical parameters deterioration laws of rock mass in mining unloading |
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| HU Jian-hua
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LEI Tao
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LUO Xian-wei
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ZHOU Ke-ping
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ZHANG Chao-lan.Study of mechanical parameters deterioration laws of rock mass in mining unloading[J].Rock and Soil Mechanics,2012,33(4):1123-1128. |
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| Authors: | HU Jian-hua LEI Tao LUO Xian-wei ZHOU Ke-ping ZHANG Chao-lan |
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| Institution: | Hunan Key Lab of Mineral Resources Exploitation and Hazard Control for Deep Metal Mines, School of Resources and Safety Engineering, Central South University, Changsha 410083, China |
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| Abstract: | Rock mass in the excavation disturbed zone(EDZ) would be disturbed under the process of mining,and the mechanical properties and strength parameters will be deteriorated in EDZ.The main problem is how to make sure the deterioration laws of the mechanical properties.Taking the object of test stopes on induced caving roof which is based on the continuous mining method in the No.92 ore of the Tongkeng mine,based on the unloading rock mass mechanics theory,the calculation procedure is established to simulate and analyse the rock mass mechanical parameters under excavation unloading.Combined with FEM,the equivalent model of rock mass unloading is built;and the 6 steps of continuous unloading calculations are carried out.The deterioration laws of the mechanical properties of the roof rock mass unloading are obtained in underground continuous mining.The relation functions between unloading rock mass mechanical parameters and the unloading percentage are fitted by polynomial fitting method.The results show that,after the 6th step unloading,the calculation is non-convergence.It indicates that the roof has totally been destroyed and fallen.As to the rock mechanical parameters,it shows a gradual weakening trend,including the internal friction angle,cohesion and the modulus of elasticity.These values gradually decrease to 55%,50% and 50% of the initial value.For Poisson’s ratio,it gradually increase to 1.15 times of the initial value.It is demonstrated that the rock mass mechanical parameters are deteriorated under mining unloading.The dynamic analysis theoretical basis of mining mechanical response is provided by the relation functions of unloading rock mass mechanical parameters and the unloading percentage. |
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| Keywords: | continuous mining unloading rock mass mechanics mechanical parameters unloading equivalent model |
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