中深孔开采急倾斜薄矿体采场顶板力学模型及围岩扰动规律研究

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摘要以果洛龙洼金矿开采为工程背景，首先基于弹塑性理论，将中深孔开采急倾斜薄矿体采场顶板简化为两端固支的高次超静定梁，并建立力学分析模型。分析顶板4个不同的受力变形阶段，即弹性阶段、顶板两端出现塑性区阶段、顶板两端破裂并变为简支阶段、整个顶板成为塑性流动机构阶段，确定不同阶段的顶板极限跨度，分别为7.38，9.27，9.53和10.43 m。然后基于Kachanov蠕变损伤理论对不同阶段顶板损伤断裂时间进行预测，不同受力阶段顶板断裂时间分别为51.8，15.3及14.5 d，并给出顶板两端损伤断裂时间与顶板跨度的函数关系图，基本呈三次函数关系。最后根据现场应力监测，对开采过程中围岩应力变化规律进行研究，分析表明随着工作面的推进，采场围岩应力经历缓慢增加、急剧增加、急剧降低和缓慢恢复4个阶段。

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关键词 ：采矿工程, 中深孔, 急倾斜薄矿体, 弹塑性理论, 两端固支梁, 损伤断裂, 围岩扰动

Abstract：Taking Guoluolongwa gold mining for engineering background，based on the elastoplastic theory，the roof of steep thin ore-body stope using medium-deep hole was simplified as high statically indeterminate beam which clamped at both ends，and the mechanics analysis model was established. The roof deformation process was divided into four stages，including elastic stage，the stage plastic zone occurring in the region close to both fixed ends，the stage of both fixed ends broken and becoming simple-support and the stage entire roof becoming plastic flow. The limit span of each stage were 7.38，9.27，9.53 and 10.43 m. Based on Kachanov creep damage theories，this paper made a prediction for the roof fracture time of different stages which were 51.8，15.3 and 14.5 d，and given the function relation between fracture time and roof span which presented substantially cubic function relationships. Finally，according to the on-site stress monitoring，the surrounding rock stress variation in the mining process was analyzed. Surrounding rock stress experienced four stages of slow increase，sharp increase，sharp reduce and slow recovery.

Key words： mining engineering medium-deep hole steeply-inclined thin ore elasoplastic theory clamped- clamped beam damage fracture disturbance of surrounding rock

收稿日期: 2012-12-25

引用本文:

付建新1，2，宋卫东1，2，杜建华1，2，孙新博1，2. 中深孔开采急倾斜薄矿体采场顶板力学模型及围岩扰动规律研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3277-3283.
FU Jianxin1，2，SONG Weidong1，2，DU Jianhua1，2，SUN Xinbo1，2. STUDY OF STOPE ROOF MECHANICAL MODEL AND WALL ROCK DISTURBANCE LAW OF STEEPLY-INCLINED THIN OREBODY MINING USING MEDIUM-DEEP HOLE. , 2014, 33(sl): 3277-3283.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3277

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