西南山区某气井井场地基稳定性模拟分析
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摘要
中国西南山区蕴藏着丰富的天然气资源,但随着开发规模的日益扩大,天然气井逐步转向山区这类地质环境恶劣的地区。本文以西南山区某气井为原型,在详细阐明井场区地质环境背景特征的基础上,首先对井场出现的典型地质问题——地下采空区进行定性判断和分析;之后选用F lac-2D有限差分软件,对井场加载前/后地下采空区可能造成的井场地基应力和变形特征,采用双洞和采空区这2种计算模型,进行数值模拟分析。模拟结果表明,井场加载前/后地基最大位移量为2 mm,地基局部地段出现拉应力区,但总体上地基稳定。研究结论将为后期建设中井场建筑物的优化布局及基础的选型提供依据。
There are rich gas deposits in southwestern mountainous area of China,and with the increasing scale of development,the gas exploitation are moving from plain to mountain areas where have adverse geological environment conditions.This paper takes a gas well in southwestern mountainous area as a primitive type,and based on explanation of the geological environment of the well site,firstly,we made a general assessment and analysis of the mined-out region,then chose the software Flac-2D of finite difference method to analyse the stress and deformation of foundation influenced by the load of well site before and after its construction.Simulation analysis chose two models,including double holes and mined-out area.Simulated results indicate that maximum displacement of foundation in direction y is 2 mm and tension stress appears in the part site of the foundation,but which is steady in general.Research conclusions may give a reference to the optimum layout and the lectotype of the well site foundation.
There are rich gas deposits in southwestern mountainous area of China,and with the increasing scale of development,the gas exploitation are moving from plain to mountain areas where have adverse geological environment conditions.This paper takes a gas well in southwestern mountainous area as a primitive type,and based on explanation of the geological environment of the well site,firstly,we made a general assessment and analysis of the mined-out region,then chose the software Flac-2D of finite difference method to analyse the stress and deformation of foundation influenced by the load of well site before and after its construction.Simulation analysis chose two models,including double holes and mined-out area.Simulated results indicate that maximum displacement of foundation in direction y is 2 mm and tension stress appears in the part site of the foundation,but which is steady in general.Research conclusions may give a reference to the optimum layout and the lectotype of the well site foundation.
引文
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[2]GB 18306-2001,中国地震动参数区划图[S].
[3]GB 50011-2001,建筑抗震设计规范[S].
[4]SY/T 5466-2004,钻前工程及井场布置技术要求[S].
[5]马少坤,黄茂松,刘怡林,等.红黏土地基承载力的离心模型试验与数值模拟[J].岩土工程学报,2009,31(2):276-281.Ma Sh K,Huang M S,Liu Y L,et al.Centrifugalmodel test and numerical simulation on bearing capaci-ty of red clay ground[J].Chinese Journal of Geotech-nical Engineering,2009,31(2):276-281.
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