厚砂土层斜井井壁应力分布规律三维光弹性模型试验

发布时间：2018-08-12 17:37

【摘要】：以穿越厚砂土层的某煤矿主斜井为工程背景,设计了物理模型试验,建立了斜井井壁三维光弹性应力冻结试验方法。实现了考虑斜向倾角作用下穿越厚砂土层斜井井壁应力状态的三维试验模拟,并结合应力冻结后模型横、纵向切片光弹测试得到的全场最大剪应力等值线图对井壁应力随埋深、环向角度变化规律进行了分析。研究结果表明,井壁横向切片内应力水平和应力分布不均匀性均远大于纵向切片,最大剪应力的应力集中区域出现在井壁两帮内缘水平面±25°范围内,斜井井壁顶部最大剪应力大于底部;随斜井井壁埋深增加,纵向应力近似线性增加,但不同环向角度对应的应力增加速度差异较大,从而导致不同埋深位置,井壁内部应力的量值和分布规律均有差异。
[Abstract]:Based on the engineering background of a coal mine main inclined well crossing thick sand layer, the physical model test is designed, and the three-dimensional photoelastic stress freezing test method of inclined shaft wall is established. Three-dimensional experimental simulation of sidewall stress state of inclined well through thick sand layer with consideration of oblique dip angle is realized. The maximum shear stress isoline diagram obtained by photoelastic test of full-field maximum shear stress along with buried depth is combined with the model after stress freezing. The variation law of circumferential angle is analyzed. The results show that the inhomogeneity of stress level and stress distribution in horizontal slice of shaft wall is much greater than that in longitudinal section, and the stress concentration area of the maximum shear stress appears in the horizontal plane 卤25 掳of the inner edge of the two sides of the shaft wall. The maximum shear stress at the top of the inclined shaft is greater than that at the bottom, and the longitudinal stress increases linearly with the increase of the depth of the inclined shaft wall, but the increasing speed of the stress corresponding to different circumferential angles varies greatly, resulting in different buried depth positions. There are differences in the magnitude and distribution of the stress inside the shaft wall.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点实验室;浙江工商大学技术与工程管理系;江苏建筑职业技术学校能源与交通工程学院;
【基金】：国家自然科学基金资助项目(51104146) 国家高等学校学科创新引智计划(111)资助项目(B14021)
【分类号】：TD265.32

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