【摘要】：地下水封石洞油庫通過地下水在巖體中的流動實現(xiàn)控制油庫密封性,因此研究圍巖中地下水的滲流特性具有重要意義。滲水量是油庫圍巖滲流的重要性質(zhì)參數(shù),對于了解油庫圍巖基本性能、制定注漿降滲標準和優(yōu)化運行模式具有重要的價值。作為一種地質(zhì)材料,巖體中存在不規(guī)則的裂隙,其滲流特性受到裂隙的幾何效應和力學效應影響。本文依托某國家石油儲備地下水封油庫工程,采用地質(zhì)調(diào)查、現(xiàn)場監(jiān)測、理論分析和數(shù)值模擬等方法,開展了油庫滲水量非均勻特征與分析方法研究,系統(tǒng)分析了裂隙幾何效應和力學效應對油庫滲水量分布特征影響規(guī)律,取得了如下成果:(1)通過現(xiàn)場資料統(tǒng)計了該油庫洞室圍巖中裂隙幾何參數(shù),采用H-H跡長估算公式得到了跡長的分布規(guī)律及跡長期望值;提出了輻射流條件下裂隙巖體代表性體元(REV)尺寸確定方法,對比分析了輻射流和平行流條件下REV尺寸和等效滲透系數(shù),分析了裂隙網(wǎng)絡幾何特征與巖體滲流特征非均勻關(guān)系。(2)推導了簡單條件下裂隙巖體中圓形洞室滲水量表達式,獲得了地應力場對洞室圍巖中裂隙隙寬和洞室滲水量影響特征,獲得了法向應力調(diào)整條件下地應力場引起的洞室滲水量非均勻分布特征。(3)開展了復雜條件下裂隙巖體中圓形洞室滲水量分析,采用離散介質(zhì)流固耦合理論,研究了地應力場、裂隙力學特征和裂隙幾何特征對洞室滲水量規(guī)模和分布的影響規(guī)律,獲得了法向和剪切應力共同調(diào)整條件下地應力場、剪脹效應和結(jié)構(gòu)面產(chǎn)狀引起的洞室滲水量非均勻分布特征,提出了復雜條件下裂隙巖體中洞室滲水量計算經(jīng)驗公式。
[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.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE972.2

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1 畢麗平;地下水封石洞油庫滲水量非均勻分布特征與分析方法研究[D];山東大學;2017年

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本文編號：2228898