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库水作用下弱胶结碎石土力学特性劣化规律试验研究

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弱胶结土广泛分布于金沙江两岸,其力学特性对水十分敏感.乌东德水库蓄水后,金沙江下游皎平渡渡口及山洞遗址将处于水下60～90 m处,开展库水对弱胶结土力学特性劣化规律的研究对于该遗址的保护具有重要意义.对皎平渡地区弱胶结土分别开展了干燥、天然、饱和、泡水7 d和泡水14 d状态下的直剪试验、携剪试验和三轴试验,分析了库水对弱胶结土力学特性的影响规律.结果表明,库水对弱胶结土力学特性的影响分为2个阶段:土体饱和前为第一阶段,主要受水的胶结和润滑等物理作用影响,弱胶结土的强度随含水率增大呈先升高后降低的演化规律;完全饱和后为第二阶段,受水的水解和溶解等化学作用影响显著,其力学特性劣化程度随浸水时长增加不断增大.此外,对比不同试验方法所得结果发现,试样制备过程中的扰动对弱胶结土强度测试结果有明显影响,整体上看,携剪试验的测试结果依次高于直剪试验和三轴试验.研究结果可以为皎平渡遗址保护工程等库水作用下的土工结构设计与防护提供依据.
Experimental Study on the Degradation Law of Mechanical Properties of Weakly Consolidated Gravel Soil under the Influence of Reservoir Water
Weakly consolidated soil is widely distributed on both sides of the Jinsha River,and its mechanical properties are very sensitive to water.After the Wudongde Reservoir is impounded,the Jiaopingdu ferry and cave ruins in the lower rea-ches of the Jinsha River will be under 60～90 m of water.It is of great significance for the protection of the ruins to study the deterioration of mechanical properties of weakly consolidated soil by reservoir water.Direct shear tests,portable shear tests and triaxial tests were carried out on weakly consolidated soil in Jiaopingdu area under dry,natural,saturated,immersed for 7 days and 14 days respectively.The influence law of mechanical properties of weakly consolidated soil induced by reservoir water was analyzed.The results show that the influence process of reservoir water on the mechanical properties of weakly consolidated soil can be divided into two stages:the first stage is before soil saturation,and the strength of weakly consolidated soil increases first and then decreases with the increase of water content.After full saturation,the second stage is significantly affected by hydroly-sis and dissolution of water,and the deterioration degree of mechanical properties increases with the increase of water immer-sion time.In addition,by comparing the results obtained by different test methods,it is found that the disturbance during sam-ple preparation has a significant impact on the strength test results of weakly consolidated soil.Overall,the test results of the portable shear test are higher than those of the direct shear test and triaxial test.The study results can provide a basis for the design and protection of geostructures under the action of reservoir water such as Jiaopingdu ruins protection project.

weakly consolidated gravel soilwater immersion timewater contentstrengthruins protection

王帝又、王文松、吴冠仲、彭绍驰

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地质灾害防治与地质环境保护国家重点实验室,四川成都 610059

成都理工大学环境与土木工程学院,四川成都 610059

中铁西北科学研究院有限公司,甘肃兰州 730000

弱胶结碎石土 浸水时长 含水率 强度 遗址保护

四川省自然科学基金项目四川省自然科学基金项目中国中铁引导课题中铁科研院重大专项成都理工大学2023年中青年骨干教师发展资助计划项目

2022NSFSC00032022NSFSC10712020-KJ001-Z001-A12020-YD-30210912-SJGG2023-09012

2024

10.19614/j.cnki.jsks.202409034

金属矿山
中钢集团马鞍山矿山研究院 中国金属学会

金属矿山

CSTPCD北大核心
影响因子：0.935
ISSN：1001-1250
年,卷(期)：2024.(9)