红石岩堰塞坝力学参数随机场模拟研究  

Random field simulation of mechanical parameters of Hongshiyan barrier dam

作　　者：贾宇峰[1,2] 葛培杰 相彪 陈永康 JIA Yufeng;GE Peijie;XIANG Biao;CHEN Yongkang(State Key Lab of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Earthquake Engineering,Dalian University of Technology,Dalian 116024,China;College of Water Resources and Hydraulic,Yunnan Agricultural University,Kunming 650201,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]大连理工大学工程抗震研究所,辽宁大连116024 [3]云南农业大学水利学院,云南昆明650201

出　　处：《人民长江》2022年第8期173-178,共6页Yangtze River

基　　金：国家自然科学基金项目(51379029);国家重点研发计划项目(2016YFB0201001);山东省自然科学基金重点项目(ZR2020KE007)。

摘　　要：空间变异性是天然土体固有的一种属性,现场试验结果表明鲁甸地震形成的红石岩堰塞坝新堆积体具有明显的空间变异性,传统均值材料数值模型无法准确描述这种变异性。采用空间随机场理论根据现场勘测试验数据和室内三轴试验参数构建了红石岩堰塞坝的随机场模型,对该堆积体岩土力学相关参数进行了随机模拟。研究结果表明:红石岩新堆积体的邓肯-张E-B模型参数K、n、K_(b)和m服从对数正态分布;新堆积体随机场的竖向相关距离为2.84 m,水平相关距离为33.94 m;新模型能较好地模拟堆积体参数的空间变异性。Spatial variability is an inherent property of natural soil.The in-situ test results showed that the new accumulation body of Hongshiyan barrier dam generated by Ludian earthquake had obvious spatial variability,and traditional evenness model can hardly describe this spatial variability.Based on theory of spatial random field,we develop a random field model of Hongshiyan dam based on field survey data and laboratory triaxial test parameters.The geomechanical parameters of the dam body are simulated stochastically.The results show that the parameters K,n,K_(b) and m of Duncan-Chang E-B model of the Hongshiyan accumulation body obey the lognormal distribution.The vertical correlation distance of the random field of the new accumulation body is 2.84 m,and the horizontal correlation distance is 33.94 m.The presented model can well describe the spatial variability of the barrier dam body.

关 键 词：空间随机场 土石混合料 相关距离 三轴试验 红石岩堰塞坝 

分 类 号：TU43[建筑科学—岩土工程]