【摘要】：為解決西部弱膠結(jié)軟巖巷道支護(hù)難題,在內(nèi)蒙古魯新煤礦對典型弱膠結(jié)泥巖取樣,并對其進(jìn)行不同狀態(tài)(天然狀態(tài)、飽和狀態(tài)和烘干狀態(tài))和不同圍壓水平的室內(nèi)三軸壓縮試驗,分析其強度特征和基本力學(xué)指標(biāo)與圍壓的變化關(guān)系。試驗數(shù)據(jù)表明:1自然狀態(tài)下弱膠結(jié)泥巖峰值強度和殘余強度非常低,隨著圍壓的增加,泥巖的峰值強度和殘余強度均有較大提高,且峰值強度與圍壓呈對數(shù)變化關(guān)系;2泥巖對水非常敏感,隨著含水率的增加峰值強度和殘余強度均降低,峰值強度降低幅度更明顯;3通過引入三軸軟化系數(shù)進(jìn)行分析,結(jié)果表明泥巖的軟化系數(shù)隨圍壓增加而下降,泥巖3種狀態(tài)下的彈性模量與圍壓增加呈線性增大變化。最后通過泥巖三軸壓縮四階段應(yīng)力-應(yīng)變曲線的擬合分析,建立了泥巖三軸壓縮全應(yīng)力-應(yīng)變關(guān)系。
[Abstract]:In order to solve the support problem of weak cemented soft rock roadway in the west of China, the typical weak cemented mudstone was sampled in Luxin Coal Mine, Inner Mongolia, and its different state (natural state) was carried out. In the laboratory triaxial compression tests with different confining pressure levels and saturated state and drying state, the relationship between the strength characteristics and the basic mechanical indexes and the confining pressure was analyzed. The experimental data show that the peak strength and residual strength of weakly cemented mudstone are very low in the natural state of 1: 1. With the increase of confining pressure, the peak strength and residual strength of mudstone increase greatly. The relationship between peak strength and confining pressure is logarithmic, and mudstone is very sensitive to water. With the increase of water content, both peak strength and residual strength decrease, and the amplitude of peak strength decrease is more obvious by introducing triaxial softening coefficient. The results show that the softening coefficient of mudstone decreases with the increase of confining pressure, and the elastic modulus and confining pressure increase linearly. Finally, through fitting and analyzing the stress-strain curve of mudstone under triaxial compression, the full stress-strain relationship of mudstone under triaxial compression is established.
【作者單位】： 西安科技大學(xué)建筑與土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51404193) 中國博士后基金面上項目(2015M572581) 陜西省自然科學(xué)基金青年人才項目(S2015YFJQ1194)
【分類號】：TD311

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