本文關(guān)鍵詞： 黃河三角洲 工程地質(zhì)環(huán)境指標(biāo) 物理力學(xué)參數(shù) 粒度指示參量 數(shù)理相關(guān)統(tǒng)計(jì) 工程地質(zhì)條件　出處：《中國海洋大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：埕島淺海油氣開發(fā)工程所處海域，位于受渤海北東向強(qiáng)浪直接沖擊的黃河復(fù)式三角洲東北部。自黃河1976年改道后，本海區(qū)河流泥沙直接輸入大幅減少，海岸和水下岸坡遭到大幅度的侵蝕后退，位于該海域的海上石油產(chǎn)區(qū)也基本上處于較強(qiáng)的侵蝕沖刷狀態(tài)。該海域潮汐復(fù)雜，潮流作用較強(qiáng)，風(fēng)暴潮多發(fā)，水動力作用較強(qiáng)。這些因素的綜合作用使得本海區(qū)海況特征、淺層地質(zhì)條件以及海底松軟沉積物變形情況十分復(fù)雜，易發(fā)生多種災(zāi)害地質(zhì)現(xiàn)象，因而使得海底管線所處的海洋工程環(huán)境較易產(chǎn)生變化。海洋工程環(huán)境的變化易使海底管道處于強(qiáng)烈的腐蝕環(huán)境，造成研究區(qū)海底管道失效。因此，系統(tǒng)的、科學(xué)的海洋沉積環(huán)境變化對工程地質(zhì)條件影響的研究，就變得尤為必要。 本文資料依托勝利埕島油田海洋環(huán)境地質(zhì)調(diào)查評估項(xiàng)目，通過海上調(diào)查取樣、原位試驗(yàn)及室內(nèi)實(shí)驗(yàn)，分析處理得到工程地質(zhì)參數(shù)、水深以及粒度參數(shù)資料。 本文通過研究表層沉積物的鹽度、pH、Eh、密度、含水率等工程地質(zhì)環(huán)境指標(biāo)和水深、粒度參數(shù)等的平面分布規(guī)律，以及鉆孔沉積土體的物理力學(xué)參數(shù)和粒度參數(shù)的垂向分布規(guī)律，在對其進(jìn)行統(tǒng)計(jì)相關(guān)性分析的基礎(chǔ)上，得到地質(zhì)環(huán)境與粒度特征的統(tǒng)計(jì)學(xué)相關(guān)關(guān)系，并進(jìn)行線性回歸擬合，得到各個(gè)工程地質(zhì)參數(shù)與粒度指示參量之間的相關(guān)關(guān)系曲線，進(jìn)而研究粒度特征對工程地質(zhì)條件的指示性。 分析結(jié)果表明，對表層沉積物而言，其分布特征主要受控于水深因素。其工程地質(zhì)環(huán)境指標(biāo)和粒度參數(shù)在研究區(qū)的分布規(guī)律具有分帶性，西部和西南部沉積物pH、Eh、密度較高，鹽度、含水率較低，平均粒徑、中值粒徑、偏態(tài)值、峰態(tài)值較大，分選系數(shù)較小，沉積物偏粗，沉積物粒級較為集中，沉積物以較粗的砂質(zhì)粉砂和粉砂質(zhì)砂為主；東部和東北部沉積物pH、Eh、密度較低，鹽度、含水率較高，平均粒徑、中值粒徑、偏態(tài)值、峰態(tài)值較小，沉積物偏細(xì)，沉積物粒級分布較寬，以較細(xì)的粉砂和粘土質(zhì)粉砂為主。中部位于二者之間，為過渡地帶。根據(jù)表層沉積物運(yùn)移趨勢，結(jié)合相關(guān)關(guān)系可以得出，由岸向海，l栍倨膠獯鄖�，盐度值、含水率随水赦j齟蠖齟�，pH、Eh、密度隨水深增大而減��；l栍倨膠獯隕�，沉积物盐度值、含水率随水赦j齟蠖跣�，pH、Eh、密度隨水深增大而增大。 對于埕島研究區(qū)中部中心一號平臺附近海域柱狀樣沉積物而言，土體的物理力學(xué)參數(shù)與粒度參數(shù)以及取樣深度也存在著一定的相關(guān)關(guān)系。據(jù)此，可對各地質(zhì)歷史時(shí)期沉積環(huán)境下形成的工程地質(zhì)條件進(jìn)行評估。其評估結(jié)果與對比鉆孔實(shí)驗(yàn)所得數(shù)據(jù)基本一致。因此，，對于埕島海域中心一號平臺柱狀樣沉積物，其粒度特征對土體工程地質(zhì)物理力學(xué)參數(shù)具有良好的指示性，可以作為評估土體工程地質(zhì)物理力學(xué)參數(shù)的經(jīng)驗(yàn)指標(biāo)。 本文研究豐富了海底工程地質(zhì)環(huán)境研究的內(nèi)容，為研究區(qū)工程地質(zhì)環(huán)境分析提供理論依據(jù)，這對于研究區(qū)海底管道鋪設(shè)及海洋工程建設(shè)等課題有著一定的實(shí)際應(yīng)用價(jià)值。
[Abstract]:Offshore oil and gas development projects in the area, is located in Bohai North East to strong wave direct impact of the Yellow River double delta northeast. Since the Yellow River in 1976 after the diversion of river sediment in this area is directly input significantly reduced, coastal and underwater slope erosion greatly backward, in the waters of the sea oil producing areas it is basically a strong erosion state. The tidal current is complex, strong storm surge prone, the strong hydrodynamic effect. A combination of these factors makes the characteristics of shallow sea sea conditions, geological conditions and loose seabed soft sediment deformation is very complex, a variety of geological disaster prone to the phenomenon, which makes the ocean the submarine pipeline engineering environment is easy to change. Change of marine engineering environment to submarine pipeline in strong corrosive environment, causing pipeline failure. Therefore the study area, It is particularly necessary to study the influence of the systematic and scientific marine sedimentary environment on the engineering geological conditions.
Based on the Shengli Chengdao oil field marine environmental geological survey and evaluation project, the data of engineering geology, water depth and grain size parameters are obtained through marine investigation and sampling, in-situ test and laboratory experiments.
Through the study of Surface Sediment Salinity, pH, Eh, density, moisture content and other engineering geological environment index and water depth, the plane distribution of grain size parameters, the mechanical and physical parameters of soil and sedimentary grain size parameters of the vertical distribution, based on its statistical correlation analysis, statistical correlation get the geological environment and the characteristics of grain size, and linear regression, the correlation curve obtained between the various engineering geological parameters and size parameters, and then study the grain size characteristics of the engineering geological conditions of the indicator.
The analysis results show that the surface sediments, the distribution is mainly controlled by water depth factors. The distribution of engineering geological environment index and grain size parameters in the study area with zoning, West and southwest sediments pH, Eh, high density, salinity, water content is low, the average particle size, mean particle size, the skewness and kurtosis value is greater, the sorting coefficient is smaller, coarse sediments, sediment grain size is relatively concentrated, the sediment to coarse sandy silt and silty sand; the eastern and northeastern sediment pH, Eh, low density, high salinity, water ratio, average particle size, mean particle size, the skewness and kurtosis value is small, thin sediment, sediment particle size distribution is wide, with fine silt and clayey silt. Located in the middle between the two, as the transition zone. According to the sediment transport trends, combined with the relationship can be obtained by L from coast to sea. As a glue? Often? Taste and Li Shi Rong.??? Ju Ju Qian Huo Xi Jie? H, Eh, density decreases with depth; L from the meteorite Rui Liang glue??? Rong and lazy smell of americium?? Li Shi Qian Ju Huo Xian?? Jie. H, Eh and the density increases with the increase of water depth.
In Chengdao area of Central Research Center on the platform near the sea core sediments, soil physical and mechanical parameters and grain size parameters and sampling depth also has certain correlation. Accordingly, to evaluate the formation of sedimentary environment of various geological history under the engineering geological conditions. The evaluation results are basically consistent with the data comparison of drilling experimental results. Therefore, for the Chengdao center on the platform of core sediments, grain size distribution has a good indication on the physical and mechanical parameters of soil engineering geology, the experience can be used as indicators of soil physical and mechanical parameters of engineering geology evaluation.
This study enriches the research contents of the engineering geological environment of the seabed, and provides a theoretical basis for the analysis of engineering geological environment in the study area, which is of practical value for the research of submarine pipeline laying and marine engineering construction in the study area.

【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P736;P642

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