【作者】 王旭东；

【导师】 付小敏； 李树森；

【作者基本信息】 成都理工大学 ， 岩土工程， 2008， 硕士

【摘要】 小湾水电站大坝为混凝土双曲拱坝,其坝肩抗力体内发育不同性状的蚀变岩带,蚀变岩带的性状及其工程特性,特别是其蠕变特性对坝肩岩体变形及稳定性起控制作用,甚至影响大坝的安全。本论文就是结合这一工程问题,重点对蚀变岩的蠕变力学特性进行了深入分析、研究。小湾蚀变岩属于热液蚀变成因,断裂构造是热液上升的通道,蚀变岩的规模仅仅局限于断裂破碎带及其两侧,岩体结构较破碎,故在工程中被视为软岩。在研究中通过现场调研、勘察,分析了蚀变岩带在坝肩的空间分布规律,并且充分考虑了试验的代表性,在坝肩抗力体的不同部位,采集了大量蚀变岩,进行了室内试验,获得了蚀变岩的物理性质指标、长期强度和粘滞系数等蠕变力学特性参数。为处理坝肩岩体和坝体的设计提供了可靠的试验参数。在深入分析蚀变岩蠕变特性的基础上,归纳出了适合小湾电站坝肩蚀变岩的蠕变本构模型。利用岩土分析软件FLAC^3D对蚀变岩的单轴及三轴蠕变试验进行了数值模拟研究,并将单轴压缩蠕变试验模拟结果与室内试验结果进行了比较分析,得到满意结果。通过改变受力条件,对常规三轴压缩蠕变试验进行了数值模拟研究,分析了三向应力作用下,蚀变岩的蠕变特性。为进一步研究蚀变岩的蠕变特性进行了有益的探讨。更多还原

【Abstract】 The Xiaowan Hydropower station has the concrete’s dome dam, there is various Rotten-rock belt in the its dam abutment. the Rotten-rock belt’s character and it’s project characteristic, specially its creep property plays the control action to the distortion of dam abutment, even affects the security of the dam. This paper emphasizing analyze the Rotten-rock’s creep mechanical characteristic unifing this project question.The Rotten-rock of Xiaowan belongs to the hydrothermal alteration, and the rupture structure becomes the ascending channels of the heat liquid. the distribution of rotten-rock just is located in the rupture zone and its adjacent zone. the structure of its periphery rock mass is relatively fracture. So it be regarded as the soft rock in the project.Analyzed the Rotten-rock belt’s spatial distribution rule which is in the dam abutment, through the investigation and study in the locale. and Selected the different Rotten-rock to adopt the test specimen in the dam abutment, and tested in the indoor experiment. Obtained the data of physical property and the creep mechanics characteristic, such as long-term strength and viscosity coefficient of the Rotten-rock, and provided the reliable mechanics parameter for the dam abutment’s design. Summarized creep constitutive-model which is suited the Xiaowan Rotten-rock, through analysis creep property of Rotten-rock. Utilized FLAC^3D which is a numerical simulation software to analyze the single and three axes compressive creep tests, and carried on the comparative analysis the indoor creep test with the test result of numerical simulation. Finally, operated the numerical simulation with the three axes compressive creep tests,and analyzed the creep property. This article carried on the beneficial discussion for further studying the creep property of the Rotten-rock.更多还原