本文關鍵詞： 采礦工程 高應力 含瓦斯原煤 三軸壓縮 有效圍壓 瓦斯壓力　出處：《巖石力學與工程學報》2017年02期 　論文類型：期刊論文

【摘要】：利用改制后的煤巖吸附 滲透 力學耦合試驗系統(tǒng),以淮南礦區(qū)-780 m標高B10煤層的原煤樣作為研究對象,進行高應力下含瓦斯原煤常規(guī)三軸壓縮力學特性的研究。結果表明:(1)含瓦斯原煤偏應力 軸向應變曲線主要有彈性、屈服、破壞或峰后軟化段構成。其中,彈性段連續(xù)、光滑性較差,多呈現(xiàn)出應變“軟化 硬化”的波動起伏特點。(2)峰后脆性破壞特征明顯,且在相同初始瓦斯壓力下,隨著初始有效圍壓的升高,脆性向延性轉化的趨勢較弱;而在相同初始有效圍壓下,初始瓦斯壓力越大,脆性破壞特征則越顯著。(3)偏應力 側向應變曲線與軸向相比,峰前連續(xù)、光滑性更好,且?guī)缀蹙示�彈性;而峰后變化則趨同。(4)偏應力 體應變曲線,在低有效圍壓下表現(xiàn)出擴容機制,且始于峰前;而在高有效圍壓下,則從峰前越至峰后,始終向右延展,呈現(xiàn)出體積不斷收縮的趨勢,且瓦斯壓力越大,收縮特性越顯著。(5)在相同有效圍壓下,隨著瓦斯壓力的增加,峰前軸向、側向應變增加的速率,以及峰值強度、泊松比均呈增大趨勢;而彈性模量則呈降低趨勢。(6)相同瓦斯壓力下,隨著有效圍壓的增加,峰前軸向、側向應變增加的速率,以及泊松比均呈降低趨勢;而峰值強度、彈性模量則呈增大趨勢。(7)隨著圍壓或瓦斯壓力分別升高,峰值強度均呈線性增大趨勢,煤樣破壞模式以剪切破壞為主,且強度參數(shù)黏聚力和內摩擦角分別為14.02 MPa,25.93°。
[Abstract]:By using the modified coal and rock adsorption and permeability mechanical coupling test system, the raw coal samples of -780 m elevation B10 coal seam in Huainan mining area were taken as the research object. The mechanical properties of conventional triaxial compression of gas-bearing raw coal under high stress are studied. The results show that the axial strain curve of gas-bearing raw coal is mainly composed of elastic, yielding, failure or post-peak softening section, in which the elastic section is continuous. The smoothness is poor, most of them show the fluctuating and undulating characteristic of strain "softening and hardening". The brittle failure characteristic after peak is obvious, and under the same initial gas pressure, with the increase of initial effective confining pressure, the tendency of brittleness to ductility is weaker; Under the same initial effective confining pressure, the higher the initial gas pressure is, the more obvious the brittle failure is. (3) compared with the axial direction, the deformation stress and lateral strain curve are continuous in front of the peak, better in smoothness, and almost all in linear elasticity. However, the post-peak variation tends to be the same. (4) the deformation stress and strain curve shows a mechanism of expansion under low effective confining pressure, which begins before the peak, while at high effective confining pressure, it always extends to the right from the front of the peak to the back of the peak. Under the same effective confining pressure, with the increase of gas pressure, the rate of increase of peak forward axial direction, lateral strain, and peak strength are increased with the increase of gas pressure. Poisson's ratio showed an increasing trend, while elastic modulus showed a decreasing trend.) under the same gas pressure, with the increase of effective confining pressure, the rate of increase of peak forward axial strain, lateral strain and Poisson's ratio all showed a decreasing trend, while the peak strength, The elastic modulus shows an increasing trend.) with the increase of confining pressure or gas pressure, the peak strength of coal samples increases linearly. The failure mode of coal samples is mainly shear failure, and the cohesion of strength parameters and the angle of internal friction are 14.02 MPA ~ (25.93 擄).
【作者單位】： 中煤科工集團西安研究院有限公司;
【分類號】：TD322

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本文編號：1541697