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通过SEM试验和压汞试验对鲁新煤矿的风化前后煤体和岩体进行试验研究,试验结果发现:11煤的煤样在未风化前微结构排列整齐,较为密实,平均孔隙率为4.78%,风化后部分裂隙相互贯通,孔隙率急剧增加为15.1%;顶板泥岩岩样在未风化前岩样表面呈多小孔状微结构,孔隙率为24%,具有较强的吸水性,风化后的岩样孔隙率增加至28.56%,岩样表面呈片麻状结构,呈现出多个微小孔洞逐步形成大孔洞的表面特点。试验结果表明,在弱胶结软岩巷道支护尤其是大巷支护中必须采取封闭围岩的支护技术,例如混凝土喷层支护,防止巷道表面围岩持续风化,影响软岩巷道稳定性。
Through the SEM test and mercury intrusion test, the coal bodies and rock masses before and after weathering in Luxin Mine were tested. The results showed that the coal samples of 11 coal were arranged neatly and densely before weathered, with an average porosity of 4.78% , Part of the cracks after weathered through each other, the porosity increased sharply to 15.1%; rock samples on the roof of unpredicted rock samples before the surface was a small porous microstructure, a porosity of 24%, with strong water absorption, weathering The porosity of rock samples increased to 28.56%. The surface of the samples showed patchouli structure, which showed the appearance of many small holes gradually forming the surface of large holes. The test results show that it is necessary to adopt the support technology of confined surrounding rock in roadway support, especially for roadway with weak cementing, such as concrete shotcrete support to prevent the continuous weathered surrounding rock of the roadway and affect the stability of soft rock roadway .