琼州海峡跨海工程新Ⅶ线区地质条件及地质灾害因素评价
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摘要
通过对琼州海峡跨海工程(固定式)新Ⅶ线调查区浅层地质—地球物理特征的研究,揭示了研究区的地形地貌特征及地质条件,并对区内主要地质灾害因素进行了评价研究,认为新Ⅶ线区内海底表面无障碍物,区内也无任何断层,目前在潮流的作用下仍在移动的沙波和沙垄是其主要的潜在地质灾害因素,而斜坡稳定性和砂土震动液化(海底以下20m范围内砂土层)在120年一遇的极端波浪荷载作用下或在地震基本烈度为Ⅶ度的情况下均不会构成该跨海工程的潜在地质灾害因素。同时还指出,虽然区内地质条件均属于不具活动能力的限制性地质条件,但其对工程设施仍具有不可忽视的潜在危险性,应给予足够重视。
Results of study on shallow geological and geophysical characteristics in new line Ⅶ survey area for the Qiongzhou Strait engineering (fixed type) reveal its topographic and geomorphic features and evaluate the geological conditions and potential geohazard factors. There are not any obstacles in the survey area’s seafloor. There are no faults within the area. The sand waves and sand ribbons that are still moving under tidal flow action are the main potential geohazard factors in new line Ⅶ survey area, but slope stability and vibration liquefaction of sandy soil(soil layers 20 m below seafloor and saturated sandy soil 20 m below seafloor)will not become a potential geohazard even under the maximum wave action once every 120 years or during earthquakes of basic intensity of Ⅶ degree. Although the geological conditions are not active,attention is still should be paid to potential danger for the engineering facilities.
Results of study on shallow geological and geophysical characteristics in new line Ⅶ survey area for the Qiongzhou Strait engineering (fixed type) reveal its topographic and geomorphic features and evaluate the geological conditions and potential geohazard factors. There are not any obstacles in the survey area’s seafloor. There are no faults within the area. The sand waves and sand ribbons that are still moving under tidal flow action are the main potential geohazard factors in new line Ⅶ survey area, but slope stability and vibration liquefaction of sandy soil(soil layers 20 m below seafloor and saturated sandy soil 20 m below seafloor)will not become a potential geohazard even under the maximum wave action once every 120 years or during earthquakes of basic intensity of Ⅶ degree. Although the geological conditions are not active,attention is still should be paid to potential danger for the engineering facilities.
引文
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