【作者】 王晓蕾；

【导师】 武雄；

【作者基本信息】 中国地质大学（北京） ， 水文学及水资源， 2011， 硕士

【摘要】 国内外对膨胀岩本构关系的研究已经有30多年,但目前对膨胀岩本构关系的研究距离指导工程实践还有一定的距离。因此,本文研究原状和重塑膨胀岩的膨胀特性和强度特性以及其本构关系,并与膨胀岩所在地区的地质背景相结合,将地质背景、变形机制和本构关系三者联系起来,对今后膨胀岩地区的工程实践具有重要意义。本文利用膨胀仪、双联固结仪、常规直剪仪及无侧限压缩仪等,分别对不同条件下的原状土和重塑土的膨胀特性和强度特性进行了一系列的试验研究,取得了以下几点成果,归纳如下:1.对国内外现有的对膨胀岩本构关系的研究进行了综述,初步对膨胀岩本构关系有了一定的了解,并通过X射线、扫描电镜、物理力学指标测定等室内试验测定了延吉盆地地区膨胀岩的矿物组成,微观结构以及物理力学性质,分析了此地区膨胀岩的类别,对本地区膨胀岩的地质背景和自身性质有了初步的认识。2.总结膨胀岩的膨胀机理和影响因素,以延吉盆地膨胀岩大量的室内试验为基础,包括不同含水率下的原状土和重塑土的无荷膨胀率试验和膨胀力试验,来分析探索膨胀岩初始含水率、外部压力等与膨胀变形量以及膨胀力的关系,并总结出膨胀应变与含水率之间的本构关系。3.通过对不同初始含水率下的原状膨胀岩施加不同的法向应力做常规直剪试验和无侧限抗压试验,以及对不同初始含水率下的重塑膨胀岩及膨胀不同时间后的重塑膨胀岩做常规直剪试验和无侧限抗压试验,来总结不同含水率和垂直压力下的膨胀岩的应力应变特性,分析和寻找初始含水率、垂直压力以及膨胀不同时间后的含水率、膨胀率与抗剪强度,以及抗剪强度指标粘聚力和内摩擦角之间的关系,充分认识膨胀岩的峰值强度、残余强度随初始条件的变化特性,建立了抗剪强度、粘聚力、内摩擦角与初始含水率及膨胀后含水率的定量关系,并通过无侧限试验来分析含水率对与单轴抗压强度之间的关系,并进行拟合得到回归方程,得到含水率与抗压强度之间的定量关系,总结出膨胀岩的本构关系。4.通过对膨胀变形及抗剪强度、单轴抗压强度与含水率关系之间规律的总结,与工程实践相结合,寻找出膨胀岩施工过程中应保持的最优含水率。更多还原

【Abstract】 The constitutive relationship of expansive rock at home and abroad has been studied for more than 30 years, but this research of constitutive relationship of the expansive rock has quite a distance from guiding engineering practice. Therefore, this study paid attentions on the expansive characteristics ,strength characteristics and constitutive relationship of undisturbed and remolded expansive rocks .Also,this study,which had combined the characteristics with the geological background of rock ,has a great significance for the projects in the area full of expansive rocks in the future,due to the research was the combination of the geological setting, deformation mechanisms and constitutive relationship.The expansion characteristics and strength properties of undisturbed and remolded soil under different conditions are respectively studied in this paper,according to a series of experiments in room,in which light dilatometer, double oedometer, direct shear apparatus and the conventional unconfined compression apparatus, etc.The main achievements in this paper can be obtained as follows.1.On the domestic and international study of the constitutive relationship of expansive rock are reviewed, and a certain and initial understanding of the swelling rock,s constitutive relation had been had.Then, the mineral composition, microstructure and physical and mechanical properties of the Yanji Basin expansive rock was determined through X-ray, scanning electron microscopy, determination of physical and mechanical laboratory , the type of expansive rock was confirmed, and the region’s geological background and expansive nature of the rocks was realized primarily.2.Summary expansion mechanism and influence factors of the expansive rock, based on the laboratory tests of the expansive rocks in Yanji Basin, including no-load expansion and expansion capacity test of the original and remodeling soils under different moisture content . Analyse the test results and explore the constitutive relationship between the swelling strain and moisture content .3.Through the routine direct shear stress testing and unconfined compression tests of the different initial moisture content of the original expansive rocks ,as well as different initial moisture content of the remodeling expansive rocks and the ones which had expansive at different times, to sum up the stress-strain behavior of the expansive rocks under different water content and vertical pressure. Then analysis and search for the relations between the initial water content, vertical pressure , the moisture content of the rocks expansive for different times and shear strength and parameters of shear strength including cohesion and internal friction angle , and expansion of After swelling and, and establish the quantitative relationship of anti- shear strength, cohesion, internal friction angle and initial moisture content and moisture content after expansion , and fit regression equation of the relationship between the water content and compressive strength .4.Through summarying the relationship between the expansion deformation and shear strength, uniaxial compressive strength and moisture content, and combining with the engineering practice, look for the optimum water content in the construction process of the area full of swelling rocks.更多还原