CAJ | 학술논문

针对软板岩内部特殊的构造及其遇水膨胀的特点，以湖南省怀化芷江地区的板岩为例，选取14组岩样分别进行矿物成分、微观结构测试和侧向约束膨胀试验，研究软质板岩的膨胀特性及其微观机制。结果表明：软质板岩侧向约束膨胀率与吸水时间之间呈指数函数关系，在试验早期，侧向约束膨胀率随吸水时间的延长而增大，且增长速率较快，侧向约束膨胀率-吸水时间关系曲线较陡；在试验后期，侧向约束膨胀率趋于稳定，侧向约束膨胀率-吸水时间关系曲线由陡变缓。侧向约束膨胀率随着吸水率的增长呈乘幂函数关系增长，在试验早期增长较快，而后增长速率变小，直至最后趋于稳定。轴向膨胀率随轴向荷载的增加呈负对数函数减小，初期减小幅度较大，后期逐渐变低。结构面方向和试样轴向的夹角α在区间[0°，90°]之间变化时，极限侧向约束膨胀率随着夹角α的增大而减小。
침대연판암내부특수적구조급기우수팽창적특점，이호남성부화지강지구적판암위례，선취14조암양분별진행광물성분、미관결구측시화측향약속팽창시험，연구연질판암적팽창특성급기미관궤제。결과표명：연질판암측향약속팽창솔여흡수시간지간정지수함수관계，재시험조기，측향약속팽창솔수흡수시간적연장이증대，차증장속솔교쾌，측향약속팽창솔-흡수시간관계곡선교두；재시험후기，측향약속팽창솔추우은정，측향약속팽창솔-흡수시간관계곡선유두변완。측향약속팽창솔수착흡수솔적증장정승멱함수관계증장，재시험조기증장교쾌，이후증장속솔변소，직지최후추우은정。축향팽창솔수축향하재적증가정부대수함수감소，초기감소폭도교대，후기축점변저。결구면방향화시양축향적협각α재구간[0°，90°]지간변화시，겁한측향약속팽창솔수착협각α적증대이감소。
Fourteen groups of slate samples are selected to take the mineral ingredient and microstructure test and make the lateral restraint swelling experiment and study the swelling characteristics and micromechanism of soft slate, taking slate form Zhijiang, Huaihua in Hunan province for example and considering the internal structure of soft slate and its swelling characteristics with water. The results indicate that the relationship between the lateral restraint expansion ratio and water absorption time exhibits exponential function. In the early stage of test, the expansion ratio increases with the extension of water absorption time;the growth rate is fast;and expansion ratio-time relationship curve is relatively steep. At the end of the test, the expansion tends to be stable;and the shape of the curve becomes from steep to gentle. The relationship between the expansion ratio and water absorption rate exhibits the power function. In the early stage of test, the growth rate is fast with the increase of water absorption rate, and gradually becomes lower until it tends to be stable in the late period of the test. The axial expansion rate greatly decreases in the form of logarithmic function with the increase of the axial load in the early stage of test, and gradually becomes stable in the late period of the test. When the angleαbetween the soft slate structural plane and axial direction changing from 0° to 90°, the expansion ratio reduces with the increase of angleα.