深部砂岩地层中井壁结构稳定性分析
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摘要
为研究深部砂岩地层中的井壁结构稳定性问题,分析了深部砂岩地层中井壁结构的受力特点,对井壁围岩弱胶结砂岩的力学特性进行了试验研究,建立了深部砂岩地层井壁结构受力分析数值计算模型;并采用土压力盒,对现场井壁进行了压力测试分析。结果表明:深部砂岩地层井筒围岩强度较低,孔隙率较高;井筒开挖后,围岩变形量大,自稳性能差,对扰动更为敏感。随着埋深的增加,井壁壁后压力逐渐增高,扰动范围逐渐加大,最大主应力最小值出现在井壁与围岩交界部位。井壁壁间注浆前,压力不大;由于壁间注浆压力较高,壁间注浆时,壁后压力出现短时激增,附加压力较大。随着井筒开挖面逐渐远离监测水平,地层压力重分布,并趋于稳定。
In order to study the stability of the mine shaft liner structure in the deep sandstone stratum,the paper had an analysis on the stress features of the mine shaft liner structure in the deep sandstone stratum and had a experiment study on the mechanics features of the weak cemented sandstone in the surrounding rock of the mine shaft liner.A numerical calculation model of the stress analysis on the mine shaft liner structure in the deep sandstone stratum was established.An earth pressure cell was applied to the pressure test analysis on the site mine shaft liner.The results showed that the surrounding rock strength of the mine shaft in the deep sandstone stratum was low and the porosity was high.After the excavation of the mine shaft,the deformation volume of the surrounding rock was high,the self stability performance was poor and the disturbance to the surrounding rock was sensitive.With the depth increased,the back pressure of the mine shaft liner was steadily increased and the disturbance scope was steadily increased.The min value of the max principal stress was appeared at the section between the mine shaft liner and surrounding rock.Before the grouting in the mine shaft liner,the pressure was not high.Due to the grouting pressure in the mine shaft liner was high,during the grouting in the mine shaft liner,the back pressure was highly increased in the short time and the additional pressure was high.With the excavation face of the mine shaft was steadily far from the monitoring level,the earth pressure was redistributed and was in stable.
In order to study the stability of the mine shaft liner structure in the deep sandstone stratum,the paper had an analysis on the stress features of the mine shaft liner structure in the deep sandstone stratum and had a experiment study on the mechanics features of the weak cemented sandstone in the surrounding rock of the mine shaft liner.A numerical calculation model of the stress analysis on the mine shaft liner structure in the deep sandstone stratum was established.An earth pressure cell was applied to the pressure test analysis on the site mine shaft liner.The results showed that the surrounding rock strength of the mine shaft in the deep sandstone stratum was low and the porosity was high.After the excavation of the mine shaft,the deformation volume of the surrounding rock was high,the self stability performance was poor and the disturbance to the surrounding rock was sensitive.With the depth increased,the back pressure of the mine shaft liner was steadily increased and the disturbance scope was steadily increased.The min value of the max principal stress was appeared at the section between the mine shaft liner and surrounding rock.Before the grouting in the mine shaft liner,the pressure was not high.Due to the grouting pressure in the mine shaft liner was high,during the grouting in the mine shaft liner,the back pressure was highly increased in the short time and the additional pressure was high.With the excavation face of the mine shaft was steadily far from the monitoring level,the earth pressure was redistributed and was in stable.
引文
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[3]孟庆彬,韩立军,乔卫国,等.极弱胶结地层开拓巷道围岩演化规律与监测分析[J].煤炭学报,2013,38(4):572-579.
[4]宋朝阳,纪洪广,刘阳军,等.弱胶结围岩条件下邻近巷道掘进扰动效应影响因素[J].采矿与安全工程学报,2016,33(5):806-812.
[5]宋朝阳,纪洪广,张月征,等.主应力对弱胶结软岩马头门围岩稳定性影响研究[J].采矿与安全工程学报,2016,33(6):963-969.
[6]李廷春,卢振,刘建章,等.泥化弱胶结软岩地层中矩形巷道的变形破坏过程分析[J].岩土力学,2014,35(4):1077-1083.
[7]宋朝阳,纪洪广.软弱夹层对煤矿主斜井围岩稳定性的影响分析[J].中国矿业,2016,25(8):95-99.
[8]李文秀,闻磊,刘晓敏,等.矿区区域性水平移动及其对竖井的影响[J].岩石力学与工程学报,2009,28(S2):3926-3931.
[9]宋朝阳,纪洪广,孙利辉.高地应力深立井井筒围岩应力演化与变形规律及支护分析[J].煤炭工程,2016,48(10):89-92.
[10]伍国军,陈卫忠,杨建平,等.基于软弱夹层损伤破坏模型的软岩巷道支护优化研究[J].岩石力学与工程学报,2011,30(S1):4129-4135.