發(fā)布時(shí)間：2018-09-07 17:13

【摘要】：地下水封石洞油庫(kù)通過(guò)地下水在巖體中的流動(dòng)實(shí)現(xiàn)控制油庫(kù)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(kù)圍巖滲流的重要性質(zhì)參數(shù),對(duì)于了解油庫(kù)圍巖基本性能、制定注漿降滲標(biāo)準(zhǔn)和優(yōu)化運(yùn)行模式具有重要的價(jià)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(yīng)和力學(xué)效應(yīng)影響。本文依托某國(guó)家石油儲(chǔ)備地下水封油庫(kù)工程,采用地質(zhì)調(diào)查、現(xiàn)場(chǎng)監(jiān)測(cè)、理論分析和數(shù)值模擬等方法,開(kāi)展了油庫(kù)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(yīng)和力學(xué)效應(yīng)對(duì)油庫(kù)滲水量分布特征影響規(guī)律,取得了如下成果:(1)通過(guò)現(xiàn)場(chǎng)資料統(tǒng)計(jì)了該油庫(kù)洞室圍巖中裂隙幾何參數(shù),采用H-H跡長(zhǎng)估算公式得到了跡長(zhǎng)的分布規(guī)律及跡長(zhǎng)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(duì)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(luò)幾何特征與巖體滲流特征非均勻關(guān)系。(2)推導(dǎo)了簡(jiǎn)單條件下裂隙巖體中圓形洞室滲水量表達(dá)式,獲得了地應(yīng)力場(chǎng)對(duì)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(yīng)力調(diào)整條件下地應(yīng)力場(chǎng)引起的洞室滲水量非均勻分布特征。(3)開(kāi)展了復(fù)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(yīng)力場(chǎng)、裂隙力學(xué)特征和裂隙幾何特征對(duì)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(yīng)力共同調(diào)整條件下地應(yīng)力場(chǎng)、剪脹效應(yīng)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(fù)雜條件下裂隙巖體中洞室滲水量計(jì)算經(jīng)驗(yàn)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(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE972.2

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

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本文編號(hào)：2228898