Simulation of the dynamic disturbance characteristics of the soft sediment in the Diexi ancient dammed lake, China
Simulation of the dynamic disturbance characteristics of the soft sediment in the Diexi ancient dammed lake, China
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DOI：
10.1007/s11629-020-6128-x
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发表时间：
2021-04
影响因子：
2.5
通讯作者：
Xiao-qun Wang;Jie Wei;Jiarong Zhao;Zhou Zhou-Zhou;Xin Huang
中科院分区：
文献类型：
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作者：
Xiao-qun Wang;Jie Wei;Jiarong Zhao;Zhou Zhou-Zhou;Xin Huang
在对沿着岷江叠溪古堰塞湖的早期研究中，在240余m的湖相沉积物中发现了10个具有包络和火焰结构的扰动层。本文在野外调查和室内岩心观测的基础上，对叠溪古堰塞湖地震引起的软沉积物扰动进行了研究。利用二、三自由度弹簧式地震模拟振动台对湖相沉积物进行了不同动力条件下的扰动试验。研究结果支持以下结论：（1）湖相沉积物中的扰动层是由该地区的强震引起的。(2)扰动层的特征与地震参数和沉积物固结程度有关。(3)地震烈度越大，扰动振幅越大;固结度越低，扰动振幅越大。(4)模拟试验证实叠溪古堰塞湖沉积物中的扰动层与该地区的强震相对应。这些结果对该地区正在进行的古地震研究具有参考价值。
In an earlier study of the Diexi ancient dammed lake along the Minjiang River in Southwest China, 10 disturbed layers with envelope and flame structures were found in more than 240 m of lacustrine sediments. In this paper, the soft-sediment disturbances caused by earthquakes in the Diexi ancient dammed lake were studied based on field investigations and laboratory core observations. A two- to three-degree-of-freedom spring-type earthquake simulation vibration table was used to carry out disturbance tests on lacustrine sediments under different dynamic conditions. The results support the following conclusions: (1) The disturbance layers in the lacustrine sediments were caused by strong earthquakes in the region. (2) The characteristics of the disturbance layers are related to the seismic parameters and the degree of sediment consolidation. (3) The greater the earthquake intensity is, the greater the disturbance amplitude is; moreover, the lower the consolidation degree is, the greater the disturbance amplitude. (4) The simulation tests verify that the disturbance layers in the sediments of the Diexi ancient dammed lake correspond to strong earthquakes in the region. These results are valuable for ongoing palaeoseismic research in the region.