本文選題：單軸壓縮　切入點：循環(huán)加卸載　出處：《東北大學(xué)學(xué)報(自然科學(xué)版)》2016年08期

【摘要】：對取自陜西榆橫礦區(qū)小紀(jì)汗煤礦頂板砂巖的干燥和飽和試件進(jìn)行單軸循環(huán)加卸載試驗及聲發(fā)射監(jiān)測,分析了不同含水狀態(tài)巖石的強(qiáng)度以及變形特征、聲發(fā)射特征和加卸載響應(yīng)比變化情況.結(jié)果表明,水對上述性質(zhì)具有顯著影響:飽和試件強(qiáng)度和滯回環(huán)數(shù)量均低于干燥試件,壓密階段軸向應(yīng)變比干燥試件增加18.9%,峰值強(qiáng)度前軸向應(yīng)變比干燥試件降低17.4%,干燥和飽和試件在循環(huán)加載過程中彈性模量均有增大趨勢;干燥試件在整個加卸載過程中聲發(fā)射能量累積為3.87×10-11J,飽和試件聲發(fā)射能量累積為2.58×10-11J,僅為干燥試件的66.67%;干燥和飽和試件的加卸載響應(yīng)比呈現(xiàn)類似的變化規(guī)律,但飽和試件的加卸載響應(yīng)比峰值特征時間比干燥試件短,宏觀裂紋形成得更早.
[Abstract]:Uniaxial cyclic loading and unloading tests and acoustic emission monitoring were carried out on the dry and saturated specimens of roof sandstone taken from Xiaojihan coal mine in Yuheng mining area, Shaanxi Province. The strength and deformation characteristics of rocks with different water-bearing states were analyzed. The results show that water has a significant effect on the above properties: the strength and the number of hysteresis loops of saturated specimens are lower than those of dry specimens. The axial strain is 18.9m higher than that of the dry specimen at the compaction stage, and the peak strength of the former axial strain is 17.4 less than that of the dry specimen. The elastic modulus of the dry and saturated specimens increases during cyclic loading. During the whole loading and unloading process, the accumulation of acoustic emission energy was 3.87 脳 10 ~ (-11) J for the dry specimen and 2.58 脳 10 ~ (-11) J for the saturated specimen, which was only 66.67 of the dry specimen, and the loading and unloading response ratio of the dry and saturated specimen showed a similar change. However, the loading and unloading response time of saturated specimen is shorter than that of dry specimen, and the macroscopic crack is formed earlier.
【作者單位】： 東北大學(xué)資源與土木工程學(xué)院;貴州省非金屬礦產(chǎn)資源綜合利用重點實驗室;貴州大學(xué)礦業(yè)學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃項目(2013CB227902) 國家自然科學(xué)基金資助項目(51404067)
【分類號】：TD31

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本文編號：1686300