【摘要】 为研究山东省巨野矿区埋深近700m的巨厚土层中煤矿立井水平地压大小计算方法,本文自行设计了最大固结压力可超过20MPa的高压K0蠕变试验系统。以取自巨野矿区埋深为300～600m的6组原状粘土样为例,进行了固结压力为6,8,10,12,14,16MPa下的K0蠕变固结试验,得到了相应的K0值大小,分析了K0值随深度的变化规律。用扫描电镜图像分析,结合计算机影像分析技术,对同一粘土试样在不同高压固结荷载下K0蠕变稳定后的微观结构进行了分析,发现随着埋深加大,固结压力增加,粘土的微观结构各向异性越明显;并根据这一微结构性变化特点解释了深部粘土K0值宏观变化的本质。更多还原

【Abstract】 The high pressure creep equipment was designed to study the horizontal ground stress of shaft lining in Juye mine area of Shandong province where the thickness of alluvium was nearly 700 m.The maximum consolidation pressure of the equipment could exceed 20 MPa.Six undisturbed clay samples taken from depth of 300～600 m in Juye coal field were used in K0 consolidation tests.The consolidation pressures were 6,8,10,12,14,16 MPa in these tests.The coefficients of lateral pressure K0 of the samples were obtained and the variation of K0 with depths were analyzed.The SEM tests of one clay sample under different consolidation pressure were performed and the microstructure was scanned.The variation of anisotropy of microstructure was analyzed with computer image analysis.It was shown that the anisotropy of microstructure of clay increased obviously with the increase of depth and consolidation pressure.The essential reasons of the macro variation of coefficients of lateral pressure K0 in consolidation tests were analyzed based on the microstructure characteristics.更多还原