CAJ | 학술논문

利用自主研发的含瓦斯煤岩热流固耦合三轴伺服渗流装置，以型煤试件为研究对象，进行不同温度条件下循环荷载试验，研究循环荷载作用下煤变形及渗透特性。研究结果表明：(1)随温度的升高，煤循环形成的滞回曲线所围成的面积逐渐减小。在单个循环曲线中，加、卸载阶段的主应力差、渗透率与轴向应变曲线呈现“X”状；在同一循环周期下，轴向应变与渗透率随温度的升高逐渐减小；在同一温度下，轴向变形随循环次数的增加逐渐增大。(2)随温度的升高，加载阶段曲线斜率逐渐增加，累计变形总量降低，即提高了不可逆过程的发展速率。(3)在各温度条件下，加载阶段应变及渗透率在整个循环过程中的变化均不明显。卸载阶段应变及渗透率在第1次循环期间变化较大，但从第2次循环开始，应变随循环次数的增加趋于平缓。在相同循环次数下，体积应变随温度的升高逐渐增大，渗透率逐渐减小。
이용자주연발적함와사매암열류고우합삼축사복삼류장치，이형매시건위연구대상，진행불동온도조건하순배하재시험，연구순배하재작용하매변형급삼투특성。연구결과표명：(1)수온도적승고，매순배형성적체회곡선소위성적면적축점감소。재단개순배곡선중，가、사재계단적주응력차、삼투솔여축향응변곡선정현“X”상；재동일순배주기하，축향응변여삼투솔수온도적승고축점감소；재동일온도하，축향변형수순배차수적증가축점증대。(2)수온도적승고，가재계단곡선사솔축점증가，루계변형총량강저，즉제고료불가역과정적발전속솔。(3)재각온도조건하，가재계단응변급삼투솔재정개순배과정중적변화균불명현。사재계단응변급삼투솔재제1차순배기간변화교대，단종제2차순배개시，응변수순배차수적증가추우평완。재상동순배차수하，체적응변수온도적승고축점증대，삼투솔축점감소。
Based on the self-developed triaxial servo-controlled seepage equipment for thermal-hydro-mechanical coupling of coal containing methane,the cyclic loading test is performed on coal samples under different temperatures. The results are shown as follows:(1) The area surrounded by hysteretic curve reduces gradually with temperature increase. In a single hysteresis curve,the relation curves between principal stress difference,permeability and axial strain present X-shape. In the same cycle,the axial strain and permeability decrease gradually with temperature increase. The axial deformation increases as the number of cycles increases in same temperature condition. (2) As temperature increases,the slope of curve in loading stage increases,the cumulative deformation reduces,which means the development rate of the irreversible process has been improved. (3) In different temperature conditions,the changes of strain and permeability in loading stage are not obvious during the entire cycle. In unloading stage , the strain and permeability change significantly in the first cycle,and strain curve begins to stabilize with increase of the number of cycles. When the number of cycles is the same in different temperature conditions,the volumetric strain increases gradually and the permeability decreases with increase of temperature.