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在均匀侧压力作用下井壁截面内任意点都处于三向或多向受压状态,不会出现拉应力,而在不均匀侧压力下,井壁则会产生拉应力,以某矿风井累深121m井壁在不均匀侧压力作用的结构设计为例,介绍井壁的内力计算与分析。有限元分析结果表明:在井壁模型的0°边界外缘和90°边界内缘的混凝土环向应力最小,0°边界内缘和90°边界外缘的混凝土环向应力最大,需通过提高混凝土强度或者增加井壁厚度来满足工程施工和力学要求。
Under the action of uniform lateral pressure, any point in the cross section of wellbore is in a three-dimensional or multi-directional state with no tensile stress, while under uneven lateral pressure, the wellbore will generate tensile stress. As an example, the structural design of deep 121m borehole wall under uneven pressure is introduced, and the calculation and analysis of internal forces of borehole wall are introduced. The results of finite element analysis show that the hoop stress of concrete in the outer edge of 0 ° and the inner edge of 90 ° of the borehole model is the smallest, and the hoop stress of the concrete in the inner edge of 0 ° and the outer edge of 90 ° is the highest, Concrete strength or increase the wall thickness to meet the construction and mechanical requirements.