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科技导报  2015 

斜井冻结凿井数值模拟方法

DOI: 10.3981/j.issn.1000-7857.2015.12.006, PP. 38-43

Keywords: 斜井,冻结凿井,初始应力场,掘砌过程,数值模拟

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Abstract:

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。

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