三峡库区巴东组泥化夹层特征

Mudding Catation Characteristics of Badong Formation in the Three Gorges Reservoir Region

三峡库区巴东组泥化夹层广泛发育,其分布特征及物理力学特性对库岸的稳定性具有重要的影响。以巴东县城库岸巴东组第二段、第三段泥化夹层为对象,采取了泥化夹层分别进行X射线衍射分析、颗粒级配分析和直接剪切,探讨泥化夹层的物理力学特征。结果表明:T2b2泥化夹层的颗粒大小分布较T2b3-1与T2b3-2泥化夹层均匀,且由大颗粒组成,而T2b3-2泥化夹层颗粒大小分布相对较集中;三种泥化夹层抗剪强度参数c分别为6.2 k Pa、9.5 k Pa、13.9 k Pa,分别为31.9°、29.3°、26.7°。泥化夹层剪切力学参数c、的变化趋势分别与夹层颗粒大小分布变化趋势有很强的相关性。该结果可为库岸斜坡的稳定性分析及预防提供可靠的力学参数。

Mudding citation of Badong formation widely developed,its distribution characteristics and the physical and mechanical properties have a significant impact on the stabilityof bank slope in the Three Gorges reservoir region. Taking the second paragraph（ T2b2）,third（ T2b3） mudding citation of Badong formation as an object in Badong county Badong Reservoir,T2b2,T2b3- 1,T2b3- 2these three mudding citation widely distributed in the study area were taken X-ray diffraction analysis test,particle size distribution analysis test and direct shear tests,discuss the physical and mechanical characteristics of mudding citation. The results showed that： T2b2,T2b3- 1,T2b3- 2three cements total content of mudding citation were 75%,77. 5%,82. 5%. Compared with T2b3- 1and T2b3- 2,T2b2 mudding citation particle size distribution is more uniform,and there are large particles. T2b3- 2mudding citation particle size distribution is relatively concentrated. Three kinds of mudding citation shear strength parameters c is6. 208 k Pa,9. 52 k Pa,13. 86 k Pa, is 31. 9°,29. 3°,26. 7°respectively. Mudding citation shear mechanical parameters c, value trends are strongly correlated with the total content and particle size distribution trends citationcement. The test results provide reliable mechanical parameters for reservoir bank slope stability analysis and prevention.