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为了分析考虑温度应力后作用于深厚表土层立井井壁竖向附加力,建立了由于立井内、外壁温度差产生的温度自应力和径向膨胀受阻产生的温度应力解析式。基于井壁是由于竖向应力超过钢筋混凝土井壁极限抗压强度而发生破裂的事实,对作用于井壁上的温度荷载、自重、水平侧压力和竖向附加力在井壁内产生的竖向应力分量进行了分析,结果表明,竖向附加力是导致井壁破裂的最主要因素,温度应力也是诱发井壁破裂的重要因素。同时在考虑井壁温度应力和井壁破裂特征的基础上,利用井壁结构设计理论通过反演分析得到了地层疏水沉降时井壁承受的最大竖向附加力的数值,为新建井壁设计和已建成投产井壁的安全性评估提供重要参考依据。
In order to analyze the vertical additional force acting on the shaft wall of deep overburden after considering the temperature stress, the analytical formula of temperature stress due to the temperature self-stress and the radial expansion obstruction caused by the temperature difference between the inner and outer walls of the shaft has been established. Based on the fact that the borehole wall is ruptured due to vertical stress exceeding the ultimate compressive strength of the reinforced concrete shaft lining, the vertical load generated on the borehole wall due to the temperature load, deadweight, lateral pressure and vertical additional force acting on the borehole wall The stress components are analyzed. The results show that the vertical additional force is the most important factor leading to the rupture of the shaft wall, and the temperature stress is also an important factor for the rupture of the shaft wall. At the same time, considering the thermal stress of the borehole wall and the rupture characteristics of the borehole wall, the numerical value of the maximum vertical additional force sustained by the borehole wall when the layer is drained by settlement is obtained by using the borehole wall structure design theory. Has been completed and put into operation the safety assessment of the wall to provide an important reference.