斜井冻结凿井数值模拟方法  

Method of numerical simulations for inclined shaft freezing sinking

作　　者：杨仁树[1] 王千星[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《科技导报》2015年第12期38-43,共6页Science & Technology Review

摘　　要：为提高ANSYS软件对斜井冻结凿井模拟的准确度,提出一种双模型法与改进重叠单元法相结合的数值模拟方法。以某矿主斜井表土冻结段施工为背景,考虑冻土为弹塑性介质,建立斜井冻结掘砌平面模型,采用本方法对掘砌模型进行模拟分析,并与传统方法进行比较。结果显示,采用双模型法模拟掘砌模型的初始应力-位移环境,得到的应力场、位移场与围岩未扰动状态下的理论值吻合;改进重叠单元法模拟井帮完全卸载后支护井壁的掘砌过程,得到不同模型顶面埋深下井壁内外缘的环向应力均小于10-6MPa,井壁位移均小于10-7m,与理论值接近,且本方法的模拟结果均优于传统方法,表明本方法具有较好的可行性和较高的模拟精度。In order to improve the simulation accuracy of the initial stress field and the digging process in inclined shaft sinking with ANSYS, a new method combining the double-model method and the advanced overlapping-element method is put forward. With a freezing inclined shaft construction in mind, taking the frozen soil as an elastic-plastic medium, a plane model of the freezing sinking of the inclined shaft is established, and the simulation is carried out. The simulation results show that the distribution characteristics of the model initial stress and displacement qualitatively agree with the theoretical results of the original ground stress obtained by adopting the double-model for the initial stress-displacement field. An advanced overlapping-element is adopted in simulating the excavation and support process under the total unloading, and the hoop stress of the inner shaft lining below 10^-6 MPa, and the lining displacement of below 10^-7 m under different model depths are obtained, which are close to the theoretical values. It is shown that the new method is superior to the traditional method, and is more accurate.

关 键 词：斜井 冻结凿井 初始应力场 掘砌过程 数值模拟 

分 类 号：TD262[矿业工程—矿井建设]