地下水封石洞油库渗水量非均匀分布特征与分析方法研究
发布时间：2018-09-07 17:13
【摘要】：地下水封石洞油库通过地下水在岩体中的流动实现控制油库密封性,因此研究围岩中地下水的渗流特性具有重要意义。渗水量是油库围岩渗流的重要性质参数,对于了解油库围岩基本性能、制定注浆降渗标准和优化运行模式具有重要的价值。作为一种地质材料,岩体中存在不规则的裂隙,其渗流特性受到裂隙的几何效应和力学效应影响。本文依托某国家石油储备地下水封油库工程,采用地质调查、现场监测、理论分析和数值模拟等方法,开展了油库渗水量非均匀特征与分析方法研究,系统分析了裂隙几何效应和力学效应对油库渗水量分布特征影响规律,取得了如下成果:(1)通过现场资料统计了该油库洞室围岩中裂隙几何参数,采用H-H迹长估算公式得到了迹长的分布规律及迹长期望值;提出了辐射流条件下裂隙岩体代表性体元(REV)尺寸确定方法,对比分析了辐射流和平行流条件下REV尺寸和等效渗透系数,分析了裂隙网络几何特征与岩体渗流特征非均匀关系。(2)推导了简单条件下裂隙岩体中圆形洞室渗水量表达式,获得了地应力场对洞室围岩中裂隙隙宽和洞室渗水量影响特征,获得了法向应力调整条件下地应力场引起的洞室渗水量非均匀分布特征。(3)开展了复杂条件下裂隙岩体中圆形洞室渗水量分析,采用离散介质流固耦合理论,研究了地应力场、裂隙力学特征和裂隙几何特征对洞室渗水量规模和分布的影响规律,获得了法向和剪切应力共同调整条件下地应力场、剪胀效应和结构面产状引起的洞室渗水量非均匀分布特征,提出了复杂条件下裂隙岩体中洞室渗水量计算经验公式。
[Abstract]:The sealing property of underground water reservoir is controlled by the flow of groundwater in rock mass, so it is of great significance to study the seepage characteristics of groundwater in surrounding rock. Seepage rate is an important property parameter of oil depot surrounding rock seepage, which is of great value for understanding the basic performance of oil depot surrounding rock, establishing grouting seepage reduction standard and optimizing operation mode. As a kind of geological material, there are irregular fractures in rock mass, whose seepage characteristics are affected by the geometric and mechanical effects of fractures. In this paper, by means of geological investigation, field monitoring, theoretical analysis and numerical simulation, the non-uniform characteristics and analytical methods of seepage quantity of oil depot are studied, based on the oil storage underground water sealing engineering of a certain country, and by means of geological investigation, field monitoring, theoretical analysis and numerical simulation, etc. The effects of fracture geometry effect and mechanical effect on water seepage distribution of oil depot are analyzed systematically. The following results are obtained: (1) the geometric parameters of fracture in the surrounding rock of the cavern of the oil depot are counted through the field data. The distribution of trace length and the expected value of trace length are obtained by using H-H trace length estimation formula, and the method of determining the (REV) dimension of representative volume element of fractured rock mass under the condition of radiation flow is put forward. The REV size and equivalent permeability coefficient under radiation flow and parallel flow are compared and analyzed. The non-uniform relationship between the geometric characteristics of fracture network and the seepage characteristics of rock mass is analyzed. (2) the expression of seepage quantity of circular cavern in fractured rock mass under simple conditions is derived. The influence of in-situ stress field on the width of fissure gap and the amount of water seepage in the surrounding rock of the cavern are obtained. Under normal stress adjustment condition, the non-uniform distribution characteristics of seepage amount in cavern caused by in-situ stress field are obtained. (3) the seepage quantity analysis of circular cavern in fractured rock mass under complex conditions is carried out, and the in-situ stress field is studied by using the fluid-solid coupling theory of discrete medium. The effect of fracture mechanics and fracture geometry on the scale and distribution of seepage in cavern is studied. The in-situ stress field under the condition of normal and shear stress adjustment is obtained. Based on the inhomogeneous distribution of water seepage in caverns caused by shear expansion effect and the occurrence of structural plane, an empirical formula for calculating the seepage amount of caverns in fractured rock mass under complex conditions is presented.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE972.2
本文编号：2228898
[Abstract]:The sealing property of underground water reservoir is controlled by the flow of groundwater in rock mass, so it is of great significance to study the seepage characteristics of groundwater in surrounding rock. Seepage rate is an important property parameter of oil depot surrounding rock seepage, which is of great value for understanding the basic performance of oil depot surrounding rock, establishing grouting seepage reduction standard and optimizing operation mode. As a kind of geological material, there are irregular fractures in rock mass, whose seepage characteristics are affected by the geometric and mechanical effects of fractures. In this paper, by means of geological investigation, field monitoring, theoretical analysis and numerical simulation, the non-uniform characteristics and analytical methods of seepage quantity of oil depot are studied, based on the oil storage underground water sealing engineering of a certain country, and by means of geological investigation, field monitoring, theoretical analysis and numerical simulation, etc. The effects of fracture geometry effect and mechanical effect on water seepage distribution of oil depot are analyzed systematically. The following results are obtained: (1) the geometric parameters of fracture in the surrounding rock of the cavern of the oil depot are counted through the field data. The distribution of trace length and the expected value of trace length are obtained by using H-H trace length estimation formula, and the method of determining the (REV) dimension of representative volume element of fractured rock mass under the condition of radiation flow is put forward. The REV size and equivalent permeability coefficient under radiation flow and parallel flow are compared and analyzed. The non-uniform relationship between the geometric characteristics of fracture network and the seepage characteristics of rock mass is analyzed. (2) the expression of seepage quantity of circular cavern in fractured rock mass under simple conditions is derived. The influence of in-situ stress field on the width of fissure gap and the amount of water seepage in the surrounding rock of the cavern are obtained. Under normal stress adjustment condition, the non-uniform distribution characteristics of seepage amount in cavern caused by in-situ stress field are obtained. (3) the seepage quantity analysis of circular cavern in fractured rock mass under complex conditions is carried out, and the in-situ stress field is studied by using the fluid-solid coupling theory of discrete medium. The effect of fracture mechanics and fracture geometry on the scale and distribution of seepage in cavern is studied. The in-situ stress field under the condition of normal and shear stress adjustment is obtained. Based on the inhomogeneous distribution of water seepage in caverns caused by shear expansion effect and the occurrence of structural plane, an empirical formula for calculating the seepage amount of caverns in fractured rock mass under complex conditions is presented.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE972.2
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1 毕丽平;地下水封石洞油库渗水量非均匀分布特征与分析方法研究[D];山东大学;2017年
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