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在地下工程施工中 ,为强化软弱地层 ,近年来常采用冻结施工法。在开挖后 ,由于井壁周围发生应力集中 ,其弹性应力区首先进行应力重分布 ,而后随着地应力的增大 ,冻结井壁进入塑性区。故衬砌和“围岩”承受巨大的温度应力和地应力。本文充分考虑了冻结壁的物理力学非均匀特性并按拉麦 -屈雷斯加和胡勃 -米赛斯屈服条件分别导出了冻结井壁在联合荷载作用下的弹塑性区应力和位移公式 ,这有助于分析冻结管断裂的原因和计算井壁厚度 ,并对深化地下洞室温度应力研究和优化工程设计有一定意义。
In the construction of underground works, in order to strengthen the weak strata, frozen construction methods are often adopted in recent years. After excavation, due to stress concentration around the borehole wall, the elastic stress region is firstly stress redistributed, and then with the increase of the ground stress, the wall of the freezing hole enters into the plastic zone. Therefore, lining and “rock” to withstand the enormous temperature stress and stress. In this paper, we fully consider the physical and mechanical non-uniform properties of the frozen wall and derive the stress and displacement formulas of the elastic-plastic zone of the frozen shaft wall under the combined loading according to the conditions of Lame-Kuelerga and Hubble-Misseriy yielding, This is helpful to analyze the reason of freezing pipe fracture and calculate the wall thickness, and it is of certain significance to deepen the research on temperature stress of underground caverns and optimize engineering design.