本文選題：煤與瓦斯突出 + 滲透失穩(wěn)�。� 參考：《安徽理工大學》2017年碩士論文

【摘要】：為了確定含瓦斯煤體滲透失穩(wěn)機制,根據(jù)易于發(fā)生突出的"構(gòu)造煤"與土的工程性質(zhì)相近的特點及國內(nèi)外試驗得到的煤層具有分層失去穩(wěn)特征的結(jié)果,借鑒土力學關(guān)于流土問題分析方法,建立煤層一維滲透失穩(wěn)判別式。提出"修正氣壓梯度"指標,認為當"修正氣壓梯度"達到"臨界修正氣壓梯度"時,煤層發(fā)生滲透失穩(wěn)。"臨界修正氣壓梯度"與煤層抗剪強度成正比,與煤層暴露面半徑成反比。為了驗證該判別式的合理性,改進了試驗裝置并進行試驗。滲透失穩(wěn)試驗裝置主要包括煤樣室,煤樣壓實裝置,注氣系統(tǒng)及氣壓測量系統(tǒng)。煤樣粒徑小于3.00mm,煤樣長度為500mm,采用氮氣為試驗氣體,球閥做為揭煤裝置。進行了煤樣在不同暴露面半徑及不同抗剪強度影響下的對照試驗;試驗結(jié)果驗證了該判別式的合理性,證明了煤樣暴露面半徑及抗剪強度等指標與其臨界氣壓梯度的關(guān)系。研制相關(guān)試驗裝置進行了砂土暴露面半徑對其臨界水力梯度影響模擬試驗,從而進一步探究已建立的判別式在砂土滲透破壞過程中應用的合理性,模擬試驗裝置主要包含土樣室、加壓系統(tǒng)、反力支架、隔水板、水頭調(diào)節(jié)裝置等,手動千斤頂用作土樣加壓裝置,進行了砂土在不同圓形暴露面半徑下的模擬試驗;試驗結(jié)果表明,砂土臨界水力梯度隨暴露面半徑增大而減小。
[Abstract]:In order to determine the mechanism of seepage instability of gas-bearing coal body, according to the characteristics of similar engineering properties of outburst "structural coal" and soil, and according to the result of domestic and foreign tests, the coal seam has the characteristics of stratification and instability. Based on the soil mechanics analysis method of flow soil problem, a one-dimensional seepage instability discriminant for coal seam is established. The index of "modified pressure gradient" is put forward, and it is considered that when the "modified pressure gradient" reaches "critical modified pressure gradient", the seepage instability of coal seam will occur. " The critical modified pressure gradient is proportional to the shear strength of the coal seam and inversely proportional to the radius of the exposed surface of the coal seam. In order to verify the rationality of the discriminant, the test equipment was improved and the test was carried out. Seepage instability test equipment mainly includes coal sample chamber, coal sample compaction device, gas injection system and air pressure measurement system. The diameter of coal sample is less than 3.00mm and the length of coal sample is 500mm. Nitrogen gas is used as test gas and ball valve is used as coal uncovering device. A controlled test of coal samples under the influence of different exposure surface radius and different shear strength was carried out, and the results of the test proved the rationality of the discriminant and the relationship between the critical pressure gradient and the radius of the exposed surface and the shear strength of the coal sample. In order to further explore the rationality of the application of the established discriminant in the process of sand seepage failure, a simulation test on the influence of the exposed surface radius of sand on its critical hydraulic gradient has been carried out. The simulation test equipment mainly includes the soil sample chamber, pressure system, counterforce support, water barrier plate, water head adjusting device, etc. The manual Jack is used as the soil sample pressure device, and the simulation test of sand under different circular exposed surface radius is carried out. The experimental results show that the critical hydraulic gradient decreases with the increase of the exposed surface radius.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD712

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