CAJ | 학술논문

宁东煤田主采煤层顶板广泛分布含水砂岩，该层砂岩受采动影响易于变形失稳。通过实验室试验，定量分析了含水砂岩组分，研究了其烘干、吸水随时间变化规律。研究发现该含水砂岩富含黏土矿物，砂岩分别烘干和浸水6h后含水率变化趋于稳定，且随着含水率增加该砂岩单轴抗压强度和弹性模量呈指数函数减小。声发射试验结果表明：干燥状态下，含水砂岩声发射计数峰值与应力峰值相对应，而随着含水率增加，声发射计数峰值较应力峰值位置滞后，呈现出“延迟”特征，并据此提出了预测预报该类砂岩顶板稳定的技术思路。
저동매전주채매층정판엄범분포함수사암，해층사암수채동영향역우변형실은。통과실험실시험，정량분석료함수사암조분，연구료기홍간、흡수수시간변화규률。연구발현해함수사암부함점토광물，사암분별홍간화침수6h후함수솔변화추우은정，차수착함수솔증가해사암단축항압강도화탄성모량정지수함수감소。성발사시험결과표명：간조상태하，함수사암성발사계수봉치여응력봉치상대응，이수착함수솔증가，성발사계수봉치교응력봉치위치체후，정현출“연지”특정，병거차제출료예측예보해류사암정판은정적기술사로。
Water-bearing sandstone is widely distributed in the roof of primary mining coal seam of Ningdong coal field, which is prone to deformation and instability. In this experiment component of water-bearing sandstone is quantitatively analyzed, and time relationship between drying and water suc-tion of sandstone is also studied. Research shows that this kind of sandstone is rich in clay minerals, and the variation of moisture content tends to keep stable six hours after being dried and soaked respectively;moreover, uniaxial compressive strength and elastic modulus of the sandstone decrease on the scale of exponential function with the increase of moisture content. The results of acoustic emission characteris-tics experiment show that count peak of acoustic emission of sandstone samples corresponds to the peak stress under the condition of being dried and lags behind with the increase of moisture content which shows“delaying”characteristics;in the mean time, pulse count decreases significantly with the peak of energy. According to these, technical thoughts are put forward to predict and forecast the stability of such kind of sandstone roof.