蒙特卡洛模型在现代黄河三角洲浅层沉积物压实速率模拟中的应用
发布时间：2018-12-18 06:25
【摘要】：在进行黄河三角洲浅层沉积物固结压实研究中,过去传统的方法通常基于钻孔和剖面,进行局部计算分析。为克服钻孔分布不均的局限性需研究整个现代黄河三角洲地区浅层沉积物的压实沉降特征,基于1987年黄河三角洲地区综合工程地质勘察获取的钻孔资料,采用了数学地质中的蒙特卡洛方法,结合土力学的分层总和法对整个现代黄河三角洲浅层沉积物的压实速率进行模拟,并分析了压实模拟的具体影响因素。结果表明当前浅层沉积物的90%累积概率(P90)的压实速率变化范围为0.18~9.07mm/a,影响模拟沉积层的压实速率主要因素为沉积物的初始孔隙比、压缩系数和平均沉积速率,上述要素均与压实速率呈显著正相关,软土层应是浅沉积地层压实沉降的主要贡献层。提出按照时间序列分别对不同流路时期叶瓣进行模拟,更符合现代黄河三角洲地区的沉积环境和历史,并对比23个地面沉降水准监测数据,定量分离了浅层沉积物固结压实分量,其约占沉降总量的13%。
[Abstract]:In the study of consolidation and compaction of shallow sediments in the Yellow River Delta, the traditional methods are usually based on boreholes and sections to carry out local calculation and analysis. In order to overcome the limitation of uneven distribution of boreholes, it is necessary to study the compaction subsidence characteristics of shallow sediments in the whole modern Yellow River Delta area. The Monte Carlo method in mathematical geology and the stratified summation method of soil mechanics are used to simulate the compaction rate of the shallow sediments in the whole modern Yellow River Delta and the specific factors affecting the compaction simulation are analyzed. The results show that the current 90% cumulative probability (P90) of the shallow sediments varies in the range of 0.189.07mm / a, and the main factor affecting the compaction rate of the simulated sediments is the initial porosity ratio of the sediments. The compression coefficient and the average deposition rate are all positively correlated with the compaction rate, and the soft soil layer should be the main contribution layer for the compaction settlement of shallow sedimentary strata. According to the time series, the leaf flaps of different flow paths are simulated, which is more consistent with the sedimentary environment and history of the modern Yellow River Delta region, and 23 land subsidence level monitoring data are compared. The consolidation compaction component of shallow sediment is quantitatively separated, which accounts for about 13% of the total settlement.
【作者单位】： 中国科学院海洋研究所海洋地质与环境重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(41276082)
【分类号】：P343.5;P642.26
本文编号：2385488
[Abstract]:In the study of consolidation and compaction of shallow sediments in the Yellow River Delta, the traditional methods are usually based on boreholes and sections to carry out local calculation and analysis. In order to overcome the limitation of uneven distribution of boreholes, it is necessary to study the compaction subsidence characteristics of shallow sediments in the whole modern Yellow River Delta area. The Monte Carlo method in mathematical geology and the stratified summation method of soil mechanics are used to simulate the compaction rate of the shallow sediments in the whole modern Yellow River Delta and the specific factors affecting the compaction simulation are analyzed. The results show that the current 90% cumulative probability (P90) of the shallow sediments varies in the range of 0.189.07mm / a, and the main factor affecting the compaction rate of the simulated sediments is the initial porosity ratio of the sediments. The compression coefficient and the average deposition rate are all positively correlated with the compaction rate, and the soft soil layer should be the main contribution layer for the compaction settlement of shallow sedimentary strata. According to the time series, the leaf flaps of different flow paths are simulated, which is more consistent with the sedimentary environment and history of the modern Yellow River Delta region, and 23 land subsidence level monitoring data are compared. The consolidation compaction component of shallow sediment is quantitatively separated, which accounts for about 13% of the total settlement.
【作者单位】： 中国科学院海洋研究所海洋地质与环境重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(41276082)
【分类号】：P343.5;P642.26
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