【摘要】：通過(guò)煤巖熱流固耦合試驗(yàn)系統(tǒng)(THM-2)對(duì)砂巖進(jìn)行循環(huán)加、卸載試驗(yàn),研究加、卸載速率對(duì)其變形和滲透特性的影響.結(jié)果表明:初始循環(huán)時(shí),巖石的軸向變形量Δε1較大,隨著循環(huán)試驗(yàn)的進(jìn)行,Δε1趨于穩(wěn)定,受卸載速率v2的影響較小.加載變形模量和卸載變形模量均逐漸上升,隨著循環(huán)次數(shù)的增加,上升速度逐漸變緩;同一循環(huán)內(nèi),卸載變形模量大于加載變形模量,且隨著加、卸載的進(jìn)行,差值逐漸減小.加載階段和卸載階段滲透率變化量的差值隨著循環(huán)次數(shù)的增加逐漸減小;從第5次循環(huán)開(kāi)始,滲透率曲線呈"∞"形,滲透率演化規(guī)律可以用軸向應(yīng)變的變化特點(diǎn)表征,軸向應(yīng)變的變化量Δεi1受到卸載速率vi2和應(yīng)力加載上限σimax的綜合作用,二者對(duì)應(yīng)變?cè)谛遁d初期起到積極的促進(jìn)作用,三者之間的相互關(guān)系可用冪函數(shù)表達(dá).
[Abstract]:The influence of loading and unloading rate on deformation and permeability of sandstone was studied by using coal-rock thermal-fluid-solid coupling test system (THM-2) to carry out cyclic loading and unloading tests to study the effect of loading and unloading rate on the deformation and permeability of sandstone. The results show that the axial deformation of rock 螖 蔚 1 is larger during the initial cycle. With the development of cyclic tests, 螖 蔚 1 tends to be stable, and is less affected by unloading rate v 2. In the same cycle, the unloading modulus is larger than the loading modulus, and with the loading and unloading, the difference decreases with the increase of the number of cycles. The difference of permeability variation between loading stage and unloading stage decreases with the increase of cycle times. From the fifth cycle, the permeability curve is "鈭，

本文編號(hào)：2431248