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不同断面形状硐室围岩稳定性模拟研究

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采用FLAC3D软件进行四水平三因素(埋深、侧压力系数和硐室断面形状)条件下正交模拟试验以及变单因素下的模拟试验.采用极差分析方法对硐室围岩塑性区因子δ进行分析认为,影响塑性区因子δ最大的组合为A4B4C1,各因素的主次关系依次为硐室埋深、断面形状、侧压力系数.变单因素下的模拟结果认为,圆形硐室顶底板和两帮移近量及其周围水平应力随侧压力系数的增大呈线性递增;垂直应力随侧压力系数的增大呈线性递减.圆形硐室断面塑性区因子随侧压力系数增大呈指数函数增大;硐室顶底板及两帮移近量随埋深的增大呈指数函数增大,硐室周围水平应力和垂直应力随埋深的增大均呈线性递增关系.相同的外载条件下,直墙拱形硐室顶板变形量高于底板,矩形、梯形和圆形硐室的顶底变形量相当,且圆形断面硐室的变形量最小.
Simulation study on stability of surrounding rock of chambers with different cross-section shapes
In this paper,FLAC3D software was used to carry out orthogonal simulation tests under the conditions of four levels and three factors(buried depth,lateral pressure coefficient and chamber cross-section),as well as simulation tests under variable factors.The range analysis method was proposed to analyze the plastic zone factor δ of the surrounding rock of the chamber,After analysis,it was considered that the largest combination affecting the plastic zone factor δ was A4B4C1,and the primary and secondary relationships of each factor were chamber burial depth,cross-section shape,and lateral pressure coefficient.The simulation results under variable factors show that the displacement of the roof and floor of the round chamber and the two sides and the horizontal stress around them increase linearly with the increase of the lateral pressure coefficient,and the vertical stress decreases linearly with the increase of the lateral pres-sure coefficient.The plastic zone factor of round chamber cross-section increases exponentially with the increase of lateral pressure coef-ficient.The displacement of the roof,floor and two sides of the chamber increases exponentially with the increase of the burial depth,and the horizontal stress and vertical stress around the chamber increase linearly with the increase of the burial depth.Under the same exter-nal load conditions,the deformation of the roof of the straight wall arch chamber is higher than that of the floor,and the deformation of the roof and floor of the rectangular,trapezoidal and round chambers is the same,and the deformation of the round section chamber is the smallest.

chamber stabilityorthogonal designnumerical simulationcross-section factor of plastic zone

何伟珺、杨玉顺、许磊、丁立立、姚立堃

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淮阴工学院 建筑工程学院,江苏淮安 223001

玛纳斯县矿山安全服务保障中心,新疆昌吉 832200

硐室稳定性 正交设计 数值模拟 塑性区断面因子

2022年江苏省大学生创新创业训练计划资助项目2019年度江苏省建设系统科技项目(指导类)2021年度"淮上英才"驻淮高校优秀博士项目江苏省省高等学校自然科学研究面上项目

202211049176XJ215350001976Z301B2251621KJB44001

2024

10.19896/j.cnki.mtkj.2024.01.022

煤炭科技
江苏省徐州矿务集团有限公司 江苏省煤炭学会 中国矿业大学

煤炭科技

影响因子：0.17
ISSN：1008-3731
年,卷(期)：2024.45(1)
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