云南省曲靖市区膨胀土的判别与分类研究

【作者】 吴伟；

【导师】 范柱国； 张红兵；

【作者基本信息】 昆明理工大学 ， 地质工程， 2006， 硕士

【摘要】 膨胀土是现代工程地质学和土力学中一个特殊的领域,它是有别于黄土、红土、软土、冻土以及普通粘土的一类特殊粘性土。膨胀土主要是由强亲水性粘土矿物成分——蒙脱石和伊利石组成的,具有膨胀结构以及多裂隙性、强胀缩性和强度衰减性的高塑性粘性土。由于膨胀土在形貌上和工程地质性质上的特殊性,以及它对于工程建筑物所产生的严重破坏作用而引起人们的高度重视。 针对曲靖市区膨胀土分布广泛,具有一定的代表性,并且产生了一定的危害。笔者结合“曲靖城市环境地质调查”项目,专门对曲靖市区膨胀土的判别与分类进行研究。本文在对曲靖市区膨胀土成因及分布研究的基础上,对曲靖市区膨胀土进行了一系列的室内土工试验,并对试验数据进行了分析。我们对曲靖市区膨胀土采用野外地质地貌特征、建筑物破坏变形特征及试验指标来综合判别,并按照曲靖市区膨胀土的特性指标和野外地质特征将曲靖市区膨胀土分成强、中、弱三种膨胀土。根据曲靖市区膨胀土特征和当地实际工程建议对该区膨胀土地基问题采取爆扩桩来进行处理。更多还原

【Abstract】 Expansive soil is a special field in modern engineering geology and soil mechanics, it is a special field kind of clay, different from loess, laterite, soft soil, frozen soil and common clay. Expansive soil is composed of a great deal of strong hydrophilic clay minerals, such as montmorillonite and illite, it has much character, such as expansive construction, many cracks, strong expansive and contraction, intensity decadence. Expansive soil causes people’s great attention on figure, specialization of engineering geology character, and it makes great destroy to engineering building.According to the distribution of expansive soil in Qujing urban is very wide, it has typicality, and makes certain endanger, author research judgment and classification of expansive soil in Qujing urban by combine with the project of "Qujing city environment geological survey". This paper is on the basis of researching the cause of formation and distribution of expansive soil in Qujing urban, laboratory experiments have been done on representative samples from Qujing urban, and analyze the experimental data. We use comprehensive discrimination to expansive soil by outdoor geology and physiognomy characteristic, destroy characteristic of building and experimental index. According to the special index and outdoor geology character of expansive soil in Qujing urban , it is divided in strongly, center and the weak expansive soil. It is suggested taking explode-expand stakes to deal with expansive soil foundation by character of expansive soil and the local actual project.更多还原