【摘要】：利用自主研發(fā)的煤巖剪切-滲流耦合試驗(yàn)裝置,開展了滲透水壓作用下完整砂巖試件剪切-滲流耦合特征試驗(yàn)研究。結(jié)果表明:(1)在恒定滲透水壓情況下,法向應(yīng)力越大,砂巖的抗剪強(qiáng)度越高,法向變形則越小,砂巖的剪切變形過(guò)程可分為3個(gè)階段:剪切變形的線性增長(zhǎng)階段、非穩(wěn)定破裂發(fā)展階段和剪斷后的摩擦滑移階段;(2)在恒定滲透水壓情況下,法向應(yīng)力越小,法向和剪切變形量越大,剪切斷面的起伏程度越大,表面次生裂紋發(fā)育越明顯、發(fā)育范圍越寬,砂巖的破壞程度越嚴(yán)重;(3)在整個(gè)剪切過(guò)程中,剪應(yīng)力出現(xiàn)幾次明顯的應(yīng)力降,首次應(yīng)力降出現(xiàn)在線彈性變化末期,同時(shí)伴有水流流出,說(shuō)明首次應(yīng)力降是第一條宏觀貫通的裂紋所致,且法向應(yīng)力越大,裂隙越窄,導(dǎo)水能力越差。
[Abstract]:In this paper, the shear seepage coupling characteristics of intact sandstone specimens under the action of permeable water pressure have been studied by using the coal and rock shear seepage coupling test equipment developed by ourselves. The results show that: (1) under the condition of constant permeable water pressure, the greater the normal stress, the higher the shear strength and the smaller the normal deformation of sandstone. The shear deformation process of sandstone can be divided into three stages: the linear increasing stage of shear deformation. (2) under the condition of constant permeable water pressure, the smaller the normal stress, the greater the normal and shear deformation, the greater the fluctuation of shear section, and the more obvious the development of surface secondary cracks. (3) during the whole shear process, the shear stress appeared several times obvious stress drop, the first stress drop appeared at the end of linear elastic change, and accompanied by the outflow of water. It shows that the first stress drop is caused by the first macroscopic crack, and the greater the normal stress, the narrower the crack and the worse the water conductivity.
【作者單位】： 重慶大學(xué)煤礦災(zāi)害動(dòng)力學(xué)與控制國(guó)家重點(diǎn)實(shí)驗(yàn)室;重慶大學(xué)復(fù)雜煤氣層瓦斯抽采國(guó)家地方聯(lián)合工程實(shí)驗(yàn)室;中煤科工集團(tuán)重慶研究院有限公司;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(No.51304255,No.51474040) 中國(guó)博士后科學(xué)基金資助項(xiàng)目(No.2014M552323) 重慶市項(xiàng)目博士后資助(No.Xm2014037)~~
【分類號(hào)】：TU45
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本文編號(hào)：2269842