拉陵高里河下游区域矿井井壁冻融受力特征研究

Study on Freeze-thaw Force Characteristics of Mine Shaft Wall in the Lower Reaches of Lalinggaoli River

为探究冻结施工条件下的冻融过程对矿井井壁的温度与力学影响,以拉陵高里河下游区域为例,采用ABAQUS软件建立土体与井壁模型。利用数值模拟方法分析了冻结与融沉过程中的土体温度分布特征、井壁Mises应力特征、竖向附加力与融沉附加力随温度的演化规律。结果表明:在0℃以下时,竖向附加力的数值较为稳定,当温度超过0℃时,竖向附加力伴随着融沉过程快速降低。在0~5℃过程中,融沉附加力快速增长,当温度超过15℃后,融沉附加力达到稳定状态。在深度影响下,井壁的应力主要受到地应力的控制。随着地层深度的逐渐增加,融沉附加力最大值呈现为指数类型的变化趋势。

In order to investigate the influence of freeze-thaw process on the temperature and mechanics of mine shaft wall under freezing construction conditions,the soil and shaft wall model was established by ABAQUS software,taking the lower reaches of Lalingoli River as an example.The characteristics of soil temperature distribution,wall Mises stress,and the evolution of vertical and thawing additional forces with temperature during freezing and thawing were analyzed by numerical simulation.The results show that the value of vertical additional force is stable below 0℃,and when the temperature exceeds 0℃,the vertical additional force decreases rapidly along with the melt settling process.In the process of 0~5℃,the additional force of melt settling increases rapidly,and when the temperature exceeds 15℃,the additional force of melt settling reaches a stable state.Under the influence of depth,the stress of borehole wall is mainly controlled by ground stress.With the gradual increase of formation depth,the maximum value of the additional force shows an exponential trend.