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Earth Pressure on an Excavation Wall in Rock Mass
KSCE Journal of Civil Engineering ( IF 2.2 ) Pub Date : 2020-08-10 , DOI: 10.1007/s12205-020-1012-3
Solomon Adedokun , Moorak Son

In this study, the earth pressure on an excavation wall in rock mass is investigated under various conditions (type of rock, angle of join inclination, shear strength of joint, groundwater, permeability of wall, and earth pressure coefficient at rest). Based on the results of a physical model test of an excavation wall in joined rock mass, extended parametric study is performed considering the rock-structure interaction based on the discrete element method. The study results suggest that the earth pressure is strongly influenced by the condition of groundwater as well as the condition of wall and rock mass. The effect of groundwater on the earth pressure in a jointed rock mass different depending on rock type, the earth pressure coefficient at rest, wall permeability, and joint inclination angle. The groundwater effect was greatest under an impermeable wall condition and a vertical joint acted as an impermeable wall. Under inclined joint and groundwater conditions, the earth pressure in a permeable wall increased when compared with no groundwater condition and the increase was more evident when the earth pressure coefficient was smaller. As the rock and joint conditions were deteriorated further, the earth pressure increased and the influence of groundwater decreased. The study results also showed that for hard rock and good joint conditions, the influence of groundwater was more significant as the earth pressure coefficient increased, but as rock and joint weathered, the influence of groundwater was more significant as the earth pressure coefficient decreased.



中文翻译:

岩体中开挖墙的土压力

在这项研究中,研究了在各种条件下(岩石的类型,节理倾角,节理的抗剪强度,地下水,墙体的渗透性和静止土压力系数)在岩体中的开挖壁上的土压力。根据连接岩体中开挖墙的物理模型测试结果,基于离散元法考虑岩石与结构的相互作用,进行了扩展参数研究。研究结果表明,土压力受地下水条件以及围岩和岩体条件的强烈影响。地下水对节理岩体中土压力的影响因岩石类型,静止土压力系数,墙体渗透率和节理倾角而异。在不透水的墙体条件下,地下水的影响最大,垂直缝充当不透水的墙体。在倾斜节理和地下水条件下,与无地下水条件相比,透水壁中的土压力增加,而在土压力系数较小时,增加的压力更明显。随着岩石和节理条件的进一步恶化,土压力增加,地下水的影响减小。研究结果还表明,对于坚硬的岩石和良好的节理条件,随着土压力系数的增加,地下水的影响更为显着;而随着岩石和节理的风化,随着土压力系数的减小,对地下水的影响更为显着。在倾斜节理和地下水条件下,与无地下水条件相比,透水壁中的土压力增加,而在土压力系数较小时,增加的压力更明显。随着岩石和节理条件的进一步恶化,土压力增加,地下水的影响减小。研究结果还表明,对于坚硬的岩石和良好的节理条件,随着土压力系数的增加,地下水的影响更为显着;而随着岩石和节理的风化,随着土压力系数的减小,对地下水的影响更为显着。在倾斜节理和地下水条件下,与无地下水条件相比,透水壁中的土压力增加,而在土压力系数较小时,增加的压力更明显。随着岩石和节理条件的进一步恶化,土压力增加,地下水的影响减小。研究结果还表明,对于坚硬的岩石和良好的节理条件,随着土压力系数的增加,地下水的影响更为显着;而随着岩石和节理的风化,随着土压力系数的减小,对地下水的影响更为显着。与无地下水条件相比,透水壁中的土压力增加,而当土压力系数较小时,则增加更为明显。随着岩石和节理条件的进一步恶化,土压力增加,地下水的影响减小。研究结果还表明,对于坚硬的岩石和良好的节理条件,随着土压力系数的增加,地下水的影响更为显着;而随着岩石和节理的风化,随着土压力系数的减小,对地下水的影响更为显着。与无地下水条件相比,透水壁中的土压力增加,而当土压力系数较小时,则增加更为明显。随着岩石和节理条件的进一步恶化,土压力增加,地下水的影响减小。研究结果还表明,对于坚硬的岩石和良好的节理条件,随着土压力系数的增加,地下水的影响更为显着;而随着岩石和节理的风化,随着土压力系数的减小,对地下水的影响更为显着。

更新日期:2020-08-06
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