地下水封石油洞库初始地应力回归分析
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摘要
对于地下洞室的稳定性分析,初始地应力的回归分析是十分重要的第一步。现行的初始地应力回归方法如函数法、位移反分析法、边界法等不易操作,且准确度也不高。本文以黄岛地下水封石油洞库为例,根据实测的初始地应力拟合出水平向主应力与竖直向自重应力的关系,在已有自重应力计算结果的基础上,通过坐标变换,将拟合出的水平向主应力转换至模型坐标下的正应力和剪应力,利用FLAC3D的FISH语言,遍历所有单元读入上一步得到的正应力和剪应力,计算至收敛后直接生成初始地应力场。将回归结果与现场实测结果进行对比分析,相对误差在10%以内,取得了较好的效果,此种方法简单且有效。
For the stability analysis of underground cavern,initial stress regression analysis is a very important first step.The existing initial stress regression methods,such as function method,displacement back analysis method and boundary method,are not easy to operate.Their accuracy is not high.This paper takes the Huangdaowater sealed underground oil cavern as an example.The relationship between the principal stress and the vertical self-weight stress is obtained,according to the measured initial in-situ stress.On the basis of the numerical simulation calculated results of self-weight stress,the horizontal principal stress convert to the normal stress and shear stress of model coordinates by coordinate transformation.Finally,based on the FISH language of FLAC3D,read the normal stress and shear stress obtained in the previous step,and calculate to convergence.Then the initial stress field is generated directly.The calculated results are compared with the measured results in the field.The relative error is less than 10%.This method is simple and effective.
For the stability analysis of underground cavern,initial stress regression analysis is a very important first step.The existing initial stress regression methods,such as function method,displacement back analysis method and boundary method,are not easy to operate.Their accuracy is not high.This paper takes the Huangdaowater sealed underground oil cavern as an example.The relationship between the principal stress and the vertical self-weight stress is obtained,according to the measured initial in-situ stress.On the basis of the numerical simulation calculated results of self-weight stress,the horizontal principal stress convert to the normal stress and shear stress of model coordinates by coordinate transformation.Finally,based on the FISH language of FLAC3D,read the normal stress and shear stress obtained in the previous step,and calculate to convergence.Then the initial stress field is generated directly.The calculated results are compared with the measured results in the field.The relative error is less than 10%.This method is simple and effective.
引文
Chen X,Sun J Z,Zhang J K,et al.2009.Fitting analysis of geo-stress field inhuangdao water sealed underground oil tank site[J].Chinese Journal of Geotechnical Engineering,31(5):713-719.
Li Y S,Yin J M,Ai K,et al.2006.Geostress regression analysis method and engineering case application[J].Journal of Yangtze River Scientific Research Institute,23(4):41-46.
Qiu X B,Li S C,Li S C.2003.3D geostress regression analysis method and its application[J].Chinese Journal of Rock Mechanics and Engineering,22(10):1613-1617.
Yao X C,Li N,Qu X,et al.2010.Back analysis of three-dimensional initial geostress laxiwa underground powerhouse[J].Rock and Soil Mechanics,31(1):246-252.
Yu C,Li H B,Li G W,et al.2010.Inversion analysis of initial stress field of Dalian underground oil storage cavern[J].Rock and Soil Mechanics,31(12):3984-3990.
Yu J H,Jin W L,Zou D Q.2003.Displacement function method for analyzing initial earth stress[J].Rock and Soil Mechanics,24(3):417-419.
北京东方新星石化工程股份有限公司.2009.国家石油储备黄岛地下水封洞库工程岩土工程勘察报告[R].北京:北京东方新星石化工程股份有限公司.
陈祥,孙进忠,张杰坤,等.2009.黄岛地下水封石油洞库场区地应力场模拟分析[J].岩土工程学报,31(5):713-719.
李永松,尹健民,艾凯,等.2006.地应力回归分析方法与工程应用实例[J].长江科学院院报,23(4):41-46.
邱祥波,李术才,李树忱.2003.三维地应力回归分析方法与工程应用[J].岩石力学与工程学报,22(10):1613-1613.
姚显春,李宁,曲星,等.2010.拉西瓦水电站地下厂房三维高地应力反演分析[J].岩土力学,31(1):246-252.
于崇,李海波,李国文,等.2010.大连地下石油储备库地应力场反演分析[J].岩土力学,31(12):3984-3990.
喻军华,金伟良,邹道勤.2003.分析初始地应力场的位移函数法[J].岩土力学,24(3):417-419.
Li Y S,Yin J M,Ai K,et al.2006.Geostress regression analysis method and engineering case application[J].Journal of Yangtze River Scientific Research Institute,23(4):41-46.
Qiu X B,Li S C,Li S C.2003.3D geostress regression analysis method and its application[J].Chinese Journal of Rock Mechanics and Engineering,22(10):1613-1617.
Yao X C,Li N,Qu X,et al.2010.Back analysis of three-dimensional initial geostress laxiwa underground powerhouse[J].Rock and Soil Mechanics,31(1):246-252.
Yu C,Li H B,Li G W,et al.2010.Inversion analysis of initial stress field of Dalian underground oil storage cavern[J].Rock and Soil Mechanics,31(12):3984-3990.
Yu J H,Jin W L,Zou D Q.2003.Displacement function method for analyzing initial earth stress[J].Rock and Soil Mechanics,24(3):417-419.
北京东方新星石化工程股份有限公司.2009.国家石油储备黄岛地下水封洞库工程岩土工程勘察报告[R].北京:北京东方新星石化工程股份有限公司.
陈祥,孙进忠,张杰坤,等.2009.黄岛地下水封石油洞库场区地应力场模拟分析[J].岩土工程学报,31(5):713-719.
李永松,尹健民,艾凯,等.2006.地应力回归分析方法与工程应用实例[J].长江科学院院报,23(4):41-46.
邱祥波,李术才,李树忱.2003.三维地应力回归分析方法与工程应用[J].岩石力学与工程学报,22(10):1613-1613.
姚显春,李宁,曲星,等.2010.拉西瓦水电站地下厂房三维高地应力反演分析[J].岩土力学,31(1):246-252.
于崇,李海波,李国文,等.2010.大连地下石油储备库地应力场反演分析[J].岩土力学,31(12):3984-3990.
喻军华,金伟良,邹道勤.2003.分析初始地应力场的位移函数法[J].岩土力学,24(3):417-419.