海域覆岩岩性结构特征及隔水性能研究

Research on Lithology Characteristic and Water-resisting Property of Overlying Strata under Sea Area

覆岩岩性结构及特征决定着隔水层的隔水性能、隔水能力及导水裂缝带发育高度。隔水层的隔水能力一般取决于隔水层的厚度、岩性组合关系和岩石强度等因素。从覆岩岩石的强度特征、岩石的物理力学性质、水理性质等指标,研究了覆岩的岩性结构特征;从岩石的强度、各向异性、流变性及膨胀性,对覆岩的隔水性能进行研究。认为北皂海域地层结构为软弱-软弱结构,覆岩类型属软弱-极软弱类型。岩层稳定性差,亲水性强,膨胀量大,增强了覆岩隔水性能。

Lithology structure and characteristic affect water-resisting property and height of water-conductive fissure zone.The water-resisting ability of aquifuge depends on its thickness,lithologies combination relationship and rock strength.This paper researched lithology characteristic of overlying strata from rock strength,physical and mechanics properties and hydrological properties.It also analyzed water-resisting property of overlying strata from rock strength,anisotropy,rheological property and dilatability.Results showed that stratal configuration of Beizao Sea Area was soft-soft structure and overlying strata type was soft-extremely soft structure.Because the stability of overlying strata was weak,its hydrophilicity was strong and swell capacity was large,its water-resisting property was increased.