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The Engineering Geological Characteristic and Its Suitability Analysis in ShuangTaiZi Estuary Region

Author: LiuAiJiang
Tutor: WuJianZheng；ZhuLongHai
School: Ocean University of China
Course: Marine Geology
Keywords: Shuangtaizi Estuary Engineering geology Hazard geology Mobile platform
CLC: P754
Type: Master's thesis
Year: 2009
Downloads: 93
Quote: 2
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Abstract


With increasing the degree of ocean development, the marine industry has gradually become an important part of the development of the national economy, the exploration and development of offshore oil and gas resources is one of the country's energy strategy. Investigation subsea engineering geological characteristics and its variation, to identify potential geological disasters factors in the region for marine construction services, has important guiding significance to the development of offshore oil and gas resources. Liaohe Oilfield routing and drilling, water depth, topography and shallow stratigraphic exploration wellsite survey data to explore the the Shuangtaizi estuarine engineering geological characteristics and engineering suitability. Based on the characteristics of engineering geology and depositional environment of the study area is divided into four sedimentary area of ??shallow marine area, the Gaizhou beach depositional area, tidal channel deposition zone and estuarine tidal flat - tidal channel deposition zone. Estuarine tidal flat - tidal channel deposition zone geomorphology, sedimentary environment complex, specific analysis of recent tidal flat formed over the past few years, tidal channels and shallow marine surface sediments are mainly silt, silty soil, its engineering The poor nature; cover bottomland and recent intertidal sediments of the same as the silt, sandy silt, but recently the intertidal than cover bottomland low intensity. The study area there are more disasters, geological phenomena, mainly the erosion residue formed due to seabed scour and erosion ditch buried tidal channel buried valley, shallow gas, etc., the presence of these disasters geological phenomenon tremendous offshore operations inconvenience handled properly will lead to irreparable engineering accidents. The seat bottom platform suitable for the job, in cover bottomland deposition and the recent influx of beach sediment area jobs, the surface layer of silt, sandy silt sand flow easily formed under the action of the waves and the trend in the area of ??each deposition, and cause the seat bottom type slip platform when operating in shallow marine areas and tidal channel deposition area, due to the two districts muddy surface sediment, the platform in place, there is a greater settlement; platform with a pile shoe suitable cover marshland and tidal channel deposition operating area, but the second layer of silt in the tidal channel deposition zone thickness uneven, some regions will occur pierced destruction; the no pile boots platform suitable in various districts operating, bearing layer depth of 10-20m, mainly silt and sand quality powder soil. Deposition within the different operating platforms in the wave and current action there are more serious erosion, scour depth caused by excessive soil reduce the lateral resistance of the pile, so that the lower part of the main holding force granular soil liquefaction, resulting in Pile unstable platform.

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