【摘要】：采場(chǎng)中充填體的幾何結(jié)構(gòu)和力學(xué)特性是影響充填體質(zhì)量的控制性因素。通過(guò)開(kāi)展充填料漿流動(dòng)沉降相似模擬試驗(yàn)及充填體單軸和常規(guī)三軸壓縮試驗(yàn),揭示采場(chǎng)充填體的結(jié)構(gòu)特征與強(qiáng)度分布規(guī)律,研究不同圍壓下不均勻充填體的變形特征與破壞模式。結(jié)果表明,(1)采場(chǎng)內(nèi)充填體存在兩個(gè)分界面和粗骨料、細(xì)骨料及灰砂3個(gè)不同區(qū)域,沿充填料漿流動(dòng)方向,充填體的強(qiáng)度呈減小 增加 減小的"S"型分布;(2)充填體三軸壓縮軸向應(yīng)力 應(yīng)變曲線包括壓密、彈性、屈服、應(yīng)變軟化、殘余強(qiáng)度5個(gè)階段,相同區(qū)域充填體的強(qiáng)度隨圍壓增加而上升,相同圍壓下不同區(qū)域的充填體強(qiáng)度大小依次為灰砂區(qū)域細(xì)骨料區(qū)域粗骨料區(qū)域。不同區(qū)域充填體的黏聚力大小依次為灰砂區(qū)域細(xì)骨料區(qū)域粗骨料區(qū)域,內(nèi)摩擦角大小依次為粗骨料區(qū)域細(xì)骨料區(qū)域灰砂區(qū)域;(3)隨圍壓的增大,充填體宏觀破壞裂紋呈增多的趨勢(shì),宏觀破壞主要為單斜面剪切破壞、張剪復(fù)合破壞和"Y"型破壞3種破壞形態(tài)。研究成果能為采場(chǎng)的充填鉆孔數(shù)量與位置設(shè)計(jì)及穩(wěn)定性分析提供理論依據(jù)。
[Abstract]:The geometric structure and mechanical properties of the filling body in stope are the controlling factors affecting the quality of the filling body. The structural characteristics and strength distribution of stope backfill are revealed by similar simulation test of filling slurry flow settlement and uniaxial and conventional triaxial compression tests of filling body. The deformation characteristics and failure mode of non-uniform filling body under different confining pressures were studied. The results are as follows: (1) there are two interfaces and three different areas of coarse aggregate, fine aggregate and lime sand in the backfill body along the flow direction of the filling slurry. (2) the axial stress-strain curves of the filling body under triaxial compression include five stages: compaction, elasticity, yield, strain softening and residual strength. The strength of the filling body in the same area increases with the increase of confining pressure, and the strength of the different areas under the same confining pressure is the coarse aggregate area of fine aggregate area in the same confining pressure. The cohesive force of the filling body in different regions is the coarse aggregate area of the fine aggregate area, the internal friction angle is the coarse aggregate area and the fine aggregate area of the coarse aggregate area in turn. (3) with the increase of the confining pressure, the cohesive force of the filling body is the coarse aggregate area, the internal friction angle is the coarse aggregate area and the fine aggregate area is in turn. The macroscopic failure cracks of the filling body show an increasing trend. The macroscopic failure mainly consists of three failure modes: single inclined shear failure, tension-shear composite failure and "Y" type failure. The results can provide theoretical basis for the design and stability analysis of the number and position of filling boreholes in stope.
【作者單位】： 華北理工大學(xué)礦業(yè)工程學(xué)院;華北理工大學(xué)河北省礦業(yè)開(kāi)發(fā)與安全技術(shù)實(shí)驗(yàn)室;
【基金】：河北省自然科學(xué)基金項(xiàng)目(No.E2014209093,No.E2016209220)~~
【分類(lèi)號(hào)】：TD801

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相關(guān)期刊論文 前10條

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本文編號(hào)：2292443