三维裂隙网络旋转整体模型方法确定岩体渗透张量
发布时间：2018-10-05 15:42
【摘要】：研究裂隙岩石的渗流特性,对油气开采、水土开发、环境保护和气体埋存等工程都具有重要意义,其中裂隙岩体渗透张量是表征大型岩体工程渗流特性的重要参数,比如大坝、地下隧洞、核电站地基以及石油储藏等方面应用。本文采用了对实际岩体还原度非常高的离散裂隙网络模型进行岩体渗流分析,并利用邻接矩阵优化了裂隙的空间储存模式,提高了数值模拟的计算效率;进行计算机裂隙岩体三维空间旋转计算,获得更真实的三维空间渗透张量;通过控制单一变量变化考察了裂隙岩体的几何参数对岩体渗透系数的影响程度,发现迹长变化对渗透系数的改变非常明显。具体工作为:空间裂隙网络在计算机的传统储存既占用大量动态内存,又储存大量无用数据,本文用邻链表数组的方式来存储裂隙圆盘的相交情况,直接按连通分量进行有效裂隙的储存,比使用二维数组存储节省大量的内存空间。在简化的管单元离散裂隙网络模型的基础上,为使用等效连续介质模型分析渗流问题,比较分析渗透张量的两种确定方法:以不同尺寸的计算机模拟裂隙岩体试件计算相应水力梯度方向的渗透系数,分析变化程度来确定渗透张量稳定性;通过旋转三维对象的方法旋转裂隙岩体网络生成域,拟合空间中各方向渗透系数,考察与渗透椭球的相似程度,来推断渗透张量存在性。相应的数值模型由现场实测参数模拟生成,与经现场校核过的渗透张量,主渗透系数和主方向误差与实测值均在20%左右。离散裂隙网络参数用来表征裂隙岩体的空间分布,构成了裂隙网络模型的基础。岩石裂隙的几何参数影响着裂隙网络模型的渗透率。本文分析了不同水力学参数对裂隙岩体渗流的影响,并发现迹长对渗透系数的影响作用最大:当标准迹长增大1~2倍时,渗透系数增大9倍左右,当在0.5~1倍迹长区间内,初期渗透系数增幅较慢,渗透系数可以增加4倍左右;间距对渗透系数的影响作用相对较小:间距在0.5~1.5倍变化范围内,随着间距的增大,使渗透系数减小1倍的大小。
[Abstract]:The study of seepage characteristics of fractured rock is of great significance to oil and gas exploitation, soil and water exploitation, environmental protection and gas storage. Among them, Zhang Liang of fractured rock mass is an important parameter to characterize seepage characteristics of large rock mass projects, such as dams. Application of underground tunnel, nuclear power plant foundation and oil storage. In this paper, a discrete fracture network model with high reduction degree of rock mass is used to analyze the seepage of rock mass, and the spatial storage mode of fracture is optimized by using adjacent matrix, which improves the efficiency of numerical simulation. The computer calculation of three-dimensional rotation of fractured rock mass is carried out to obtain a more true three-dimensional spatial permeation Zhang Liang, and the influence of geometric parameters of fractured rock mass on the permeability coefficient of rock mass is investigated by controlling the change of single variable. It is found that the change of trace length is very obvious to the permeability coefficient. The main works are as follows: the traditional storage of space fissure network in the computer not only occupies a lot of dynamic memory, but also stores a large amount of useless data. In this paper, we use the method of adjacent list array to store the intersections of crack disks. The storage of effective cracks directly according to connected components saves a lot of memory space than using two-dimensional array storage. On the basis of simplified pipe element discrete fracture network model, in order to use equivalent continuum medium model to analyze seepage problem, Two methods of determining permeability Zhang Liang are compared and analyzed: the permeability coefficient of hydraulic gradient direction is calculated by computer simulation of fractured rock mass specimen with different sizes, and the stability of infiltrating Zhang Liang is determined by analyzing the degree of variation; The existence of permeable Zhang Liang is inferred by rotating the network of fractured rock mass by rotating 3D object, fitting the permeability coefficient of every direction in the space, and investigating the similarity between the seepage ellipsoid and the seepage ellipsoid. The corresponding numerical model is generated from the field measured parameters, and the principal permeability coefficient and the principal direction error and the measured value are all about 20%, compared with Zhang Liang, which has been checked in the field. The discrete fracture network parameters are used to characterize the spatial distribution of fractured rock mass and form the basis of fracture network model. The geometric parameters of rock fracture affect the permeability of fracture network model. In this paper, the influence of different hydraulic parameters on seepage of fractured rock mass is analyzed, and it is found that trace length has the greatest effect on permeability coefficient: when the standard track length increases by 1 ~ 2 times, the permeability coefficient increases about 9 times, and when the trace length is 0.5 ~ 1, the permeability coefficient increases by about 9 times. At the beginning, the increase of permeability coefficient is slow, the permeability coefficient can be increased by about 4 times, and the effect of spacing on permeability coefficient is relatively small: when the distance is in the range of 0.5 ~ 1.5 times, the permeability coefficient decreases by 1 times with the increase of the distance.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU45
本文编号：2253951
[Abstract]:The study of seepage characteristics of fractured rock is of great significance to oil and gas exploitation, soil and water exploitation, environmental protection and gas storage. Among them, Zhang Liang of fractured rock mass is an important parameter to characterize seepage characteristics of large rock mass projects, such as dams. Application of underground tunnel, nuclear power plant foundation and oil storage. In this paper, a discrete fracture network model with high reduction degree of rock mass is used to analyze the seepage of rock mass, and the spatial storage mode of fracture is optimized by using adjacent matrix, which improves the efficiency of numerical simulation. The computer calculation of three-dimensional rotation of fractured rock mass is carried out to obtain a more true three-dimensional spatial permeation Zhang Liang, and the influence of geometric parameters of fractured rock mass on the permeability coefficient of rock mass is investigated by controlling the change of single variable. It is found that the change of trace length is very obvious to the permeability coefficient. The main works are as follows: the traditional storage of space fissure network in the computer not only occupies a lot of dynamic memory, but also stores a large amount of useless data. In this paper, we use the method of adjacent list array to store the intersections of crack disks. The storage of effective cracks directly according to connected components saves a lot of memory space than using two-dimensional array storage. On the basis of simplified pipe element discrete fracture network model, in order to use equivalent continuum medium model to analyze seepage problem, Two methods of determining permeability Zhang Liang are compared and analyzed: the permeability coefficient of hydraulic gradient direction is calculated by computer simulation of fractured rock mass specimen with different sizes, and the stability of infiltrating Zhang Liang is determined by analyzing the degree of variation; The existence of permeable Zhang Liang is inferred by rotating the network of fractured rock mass by rotating 3D object, fitting the permeability coefficient of every direction in the space, and investigating the similarity between the seepage ellipsoid and the seepage ellipsoid. The corresponding numerical model is generated from the field measured parameters, and the principal permeability coefficient and the principal direction error and the measured value are all about 20%, compared with Zhang Liang, which has been checked in the field. The discrete fracture network parameters are used to characterize the spatial distribution of fractured rock mass and form the basis of fracture network model. The geometric parameters of rock fracture affect the permeability of fracture network model. In this paper, the influence of different hydraulic parameters on seepage of fractured rock mass is analyzed, and it is found that trace length has the greatest effect on permeability coefficient: when the standard track length increases by 1 ~ 2 times, the permeability coefficient increases about 9 times, and when the trace length is 0.5 ~ 1, the permeability coefficient increases by about 9 times. At the beginning, the increase of permeability coefficient is slow, the permeability coefficient can be increased by about 4 times, and the effect of spacing on permeability coefficient is relatively small: when the distance is in the range of 0.5 ~ 1.5 times, the permeability coefficient decreases by 1 times with the increase of the distance.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU45
【参考文献】
相关期刊论文 前10条
1 王俊奇;董晔;李鹏宇;;三维离散裂隙网络管单元模型确定岩体渗透张量的尝试[J];水利与建筑工程学报;2016年03期
2 周志芳;庄超;;裂隙岩体渗透张量的特征值扰动分析[J];水利学报;2015年05期
3 王俊奇;岳潇;李闯;;三维裂隙网络管单元模型确定岩体渗透张量[J];华北电力大学学报(自然科学版);2015年01期
4 刘武;陈益峰;胡冉;周创兵;;基于非稳定渗流过程的岩体渗透特性反演分析[J];岩石力学与工程学报;2015年02期
5 马秀媛;芮洪兴;王倩;;多尺度岩石渗透特性的试验研究[J];岩土力学;2014年08期
6 刘倩;李宏;张永彬;;基于边界元法的岩体渗透系数尺寸效应研究[J];济南大学学报(自然科学版);2015年03期
7 车富强;陈益峰;李毅;张璇;郑海圣;;基于等效连续介质的坝区裂隙岩体渗控效应分析[J];中南大学学报(自然科学版);2014年06期
8 吴锦亮;何吉;陈胜宏;;裂隙岩体三维渗透张量及表征单元体积的确定[J];岩石力学与工程学报;2014年02期
9 杨建平;陈卫忠;吴月秀;谭贤君;;裂隙岩体等效渗透系数张量数值法研究[J];岩土工程学报;2013年06期
10 叶祖洋;姜清辉;姚池;周创兵;;岩体裂隙网络非稳定渗流分析与数值模拟[J];岩土力学;2013年04期
相关硕士学位论文 前1条
1 叶茂;三维裂隙网络线单元渗流模型及其校正[D];华北电力大学;2014年
，本文编号：2253951
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2253951.html
