天荒坪电站输水系统区域断层对输水系统影响研究

发布时间：2018-06-11 10:28

本文选题：抽水蓄能电站 + 输水系统　；参考：《浙江大学》2014年硕士论文

【摘要】：针对目前天荒坪抽水蓄能电站输水系统区域存在多处集中漏水点(主要与断层、岩脉等相关)问题,即输水系统区域集中渗流问题,采用输水系统区域流固热耦合作用分析、地质雷达现场探测与围岩水力劈裂分析等手段,来研究输水系统区域各断层对输水系统的影响,确定这些集中渗漏通道,继而预测评价输水系统区域围岩体在长期高水头作用下潜在的渗透稳定性和危害性。主要研究内容如下： 1)输水系统区域水文地质、工程地质条件及相关参数的收集与分析收集分析输水系统区域水文地质、工程地质分区及其相关参数的研究成果,掌握主要断层、岩脉和裂隙组的产状性质,特别注重各个与输水系统相交切的断层渗透特性及连通延伸特性、节理裂隙发育分区及渗透特性。收集分析输水系统区域各阶段的灌浆补强、堵头延长等工程位置及范围。 2)输水系统区域流固热耦合作用分析针对天荒坪抽水蓄能电站输水系统,在有关文献的基础上,首先建立了一组多孔岩体介质瞬态的流、固、热三场全耦合方程组.(其中包括固体变形、能量传输、流体流动三个相互耦合的过程,多物理场之间的交叉耦合还包括材料性质与独立变量之间的耦合关系),然后利用COMSOL软件(基于偏微分方程组的多物理过程模拟工具)作为平台,成功求解了这一全耦合偏微分方程组,得到了天荒坪抽水蓄能电站输水系统区域流固热耦合场。 3)应用地质雷达探测输水系统区域集中渗漏部位在华东院地质勘测资料和河海大学渗漏薄弱部位探测资料等基础上,应用地质雷达探测手段,在探洞、施工支洞等洞壁渗水点部位布设测点,探测输水系统区域富水断层和节理带,初步确定了各洞壁渗水点的浅层集中渗漏通道,为下一步集中渗漏通道的反演分析提供基础。 4)高水头作用下输水隧洞围岩水力劈裂分析针对水力劈裂分析研究的不足,根据断裂力学原理重点研究了以下问题：①地下洞室围岩区各种类型裂隙的Ⅰ型应力强度因子计算方法、复合型裂纹发生水力劈裂理论判据；②压剪断裂的力学机理,有水压力作用的压剪断裂应力强度因子的计算及其判据；③将以上理论应用于天荒坪抽水蓄能电站输水系统岔管区围岩的水力劈裂分析中。
[Abstract]:In view of the current problems in the region of the water transmission system in the Tian Huang Ping pumped storage power station (mainly related to the fault, rock vein, etc.), that is, the problem of concentrated seepage in the region of the water conveyance system, the analysis of the coupling effect of the regional flow and solid heat in the water conveyance system, the field detection of the geological radar and the analysis of the hydraulic splitting of the surrounding rock, to study the water conveyance system. The main research contents are as follows: the influence of the regional faults on the water transport system, and determine the concentration of the seepage channels, and then predict the potential seepage stability and harmfulness of the surrounding rock body of the water conveyance system under the long-term high water head.
1) collection and analysis of regional hydrogeology, engineering geological conditions and related parameters of water conveyance system.
The research results of regional hydrogeology, engineering geological division and its related parameters are collected and analyzed. The characteristics of major faults, rock veins and fracture groups are grasped, especially the fault permeability and connected extension characteristics, the zone and permeability of joint fracture development are paid attention to, and the water transportation system is collected and analyzed. The location and scope of grouting reinforcement and plugging extension at different stages of the area are also discussed.
2) analysis of the coupling effect of the region flow and heat in the water conveyance system
On the basis of relevant documents, a group of three full coupling equations of transient flow, solid and heat are set up on the basis of the relevant literature. (including three coupled processes of solid deformation, energy transfer and fluid flow, the cross coupling between the multi physical fields also includes the properties of material and the only one. " The coupling relationship between independent variables), and then using the COMSOL software (the multi physical process simulation tool based on partial differential equations) as a platform, the whole coupling partial differential equation group is successfully solved, and the regional flow and solid heat coupling field of the water transmission system of the Tian Huang Ping pumped storage power station is obtained.
3) use geo radar to detect concentrated leakage area in water conveyance system area.
On the basis of the geological survey data of the East China Hospital and the detection data of the weak leakage parts of the Hohai University, the geological radar detection means are used to set up the test points in the seepage point of the tunnel wall, such as the holes and the construction branches. The water rich fault and the joint zone in the water transportation system are detected, and the shallow seepage passage of the seepage points of each tunnel wall is preliminarily determined, and the next one is the next one. The basis is provided for the inversion analysis of the step concentrated leakage channel.
4) hydraulic fracturing analysis of surrounding rock of water conveyance tunnel under high head action
In view of the shortage of hydraulic fracturing analysis, the following problems are studied in accordance with the principle of fracture mechanics: (1) the calculation method of type I stress intensity factor of various types of cracks in the surrounding rock of underground caverns, the theoretical criterion of hydraulic splitting of composite type cracks, and the mechanical mechanics of compressive shear fracture, and the strength of pressure shear fracture stress with water pressure The above theory is applied to the hydraulic fracturing analysis of the surrounding rock in the bifurcated area of the water conveyance system of the Tian Huang Ping pumped storage power station.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223;TV732

【参考文献】