库水波动带岸坡原位声波测试及劣化特性研究

发布时间：2018-03-02 21:30

本文选题：三峡库区　切入点：消落带　出处：《工程地质学报》2017年02期 　论文类型：期刊论文

【摘要】：为了揭示库水波动带内岩体在库水位周期性升降,干-湿循环条件下,其物理力学性质变化特征,掌握不同岩性的劣化改造过程和差异性。选择消落带内变形破坏强烈的侏罗系库岸斜坡,在宏观调查的基础上,运用单孔、跨孔声波测试方法进行原位试验测试,同时进行原位样品试件采集,运用干湿循环、力学测试、耐崩解等手段进行室内试验测试。原位单孔声波测试KV值为0.2~0.51,跨声波测试KV值为0.46~0.91,表明岩体横向完整性差,纵向完整性相对较好,并且消落带内岩体随着高程的降低,其岩体完整性呈下降趋势;试件力学测试结果表明,20次干-湿循环后其强度平均下降30%~45%,且摩擦系数和黏聚力参数均呈逐渐降低趋势;耐崩解性试验表明,干-湿循环条件下,岩石耐崩解性逐渐降低,5次干-湿循环后,试件耐崩解性指数降低量达3.1%~20.2%。试验结果均证实了消落带内岩体受库水影响强烈,岩体长期在干-湿循条件下,其物理力学性质呈降低趋势,不同岩性劣化程度不同,岩体总体向破碎、解体的趋势发展,并且具有渐进性和累积性。
[Abstract]:In order to reveal the reservoir water fluctuation zone in rock mass of reservoir water level fluctuation, dry wet cycle condition, the physical and mechanical properties changes, deterioration of the transformation process and the differences between the different lithologies. Master selection within the fluctuating zone of deformation and failure of the Jurassic reservoir slope strong, based on macroscopic investigation, use single hole, cross hole sonic testing method for in situ test, at the same time in the sample collection, the use of dry wet cycle, mechanical testing, indoor test and other means of resistance. In situ disintegration of single hole sonic testing KV value 0.2~0.51, KV value is 0.46~0.91 cross acoustic test, show that the rock mass integrity transverse, longitudinal complete relatively good, and the rock mass in the riparian zone along the elevation decreased, decreased the integrity of rock mass is the mechanical test results; test showed that the 20 dry wet cycle after the average intensity decreased by 30%~45%, and the coefficient of friction and The cohesion parameters were gradually decreased; resistance to slaking test showed that the dry wet cycle condition, rock disintegrative resistance decreased gradually, 5 times of dry wet cycles, the specimen disintegrative resistance index decreased amount of 3.1%~20.2%. test results verified that the fluctuating zone of rock mass in the strong influence of reservoir water, rock mass long in the dry wet cycle condition, the physical and mechanical properties decreased, the degree of degradation of different lithologic rock mass, the overall trend of development to fragmentation, disintegration, and with the progressive and cumulative.

【作者单位】：中国地质调查局武汉地质调查中心;
【基金】：国家自然科学基金(41372321) 中国地质调查局灾害预警项目(12120114079301) 水工环调查项目(121201009000150023)资助
【分类号】：P642.2

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