舟山软土土性参数随机场研究

发布时间：2018-06-13 21:47

本文选题：土性参数 + 随机场　；参考：《浙江海洋大学》2017年硕士论文

【摘要】：软土土性的物理力学指标是处理软土地基强度和变形的基本参数,但受历史成因、赋存环境等众多因数的影响,土性表现出明显的地域特色以及变异特性,这对地基的处理与设计往往带来巨大的困难,需要综合考虑各种因数的影响。在岩土工程不确定性模型的研究中,随机场模型经过一个多世纪的发展,受到了广泛的认同。本文在收集了舟山地区大量的工程勘察报告的基础上,结合当地的实际,软土的土性参数概率特征进行了比较细致的统计与研究。本文首先大致的介绍了随机场理论,然后在此基础上引出并介绍了岩土工程随机场理论,主要包括平稳性、各态历经性以及相关距离的理论基础和求解方法;基于收集到的工程地质勘察报告和岩土参数,利用重度和压缩模量指标,验证了舟山粉质粘土以及淤泥质粉质粘土的平稳性和各态历经性;然后结合舟山不打静探的实际情况,选取了相关距离的求解方法并利用压缩模量指标求解出了舟山主岛三区的相关距离情况。在收集整理了主岛三区22个工程场地的粉质粘土和淤泥质粉质粘土的土层参数情况下,统计了天然含水量、天然重度、塑限三个物理指标以及压缩系数、固结快剪强度指标值三个力学指标的点变异系数,并利用前面求出的相关距离值求解出了空间变异系数,然后对土性参数的自相关特性进行了比较深入的分析和研究。本文限于收集的样本数量和范围尚不足够,研究结果具有一定的不确定性。
[Abstract]:The physical and mechanical index of soft soil property is the basic parameter to deal with the strength and deformation of soft soil foundation, but affected by many factors, such as historical causes, existing environment and so on, the soil property shows obvious regional characteristics and variation characteristics. This often brings great difficulties to the treatment and design of foundation, and needs to consider the influence of various factors. In the research of geotechnical engineering uncertainty model, the random field model has been widely recognized after more than a century of development. On the basis of collecting a large number of engineering investigation reports in Zhoushan area and combining with the local practice, this paper makes detailed statistics and studies on the probability characteristics of soil parameters of soft soil. In this paper, the random field theory is introduced, and then the geotechnical engineering random field theory is introduced, including the theoretical basis and solution method of stationary, ergodic and correlation distance. Based on the collected engineering geological survey report and geotechnical parameters, the stability and ergodic behavior of silty clay and silty clay in Zhoushan are verified by using the indexes of gravity and modulus of compression, and then combined with the actual situation of non-static exploration in Zhoushan, the stability and ergodic behavior of silty clay and silty clay in Zhoushan are verified. The method of calculating the correlation distance is selected and the correlation distance of the three areas of Zhoushan main island is solved by using the compression modulus index. After collecting and arranging the soil parameters of silty clay and silty clay in 22 engineering sites in the third area of the main island, three physical indexes, natural water content, natural gravity, plastic limit and compression coefficient, were counted. The point variation coefficient of the three mechanical indexes of the consolidation quick shear strength index value is calculated, and the spatial variation coefficient is solved by using the correlation distance value, and then the autocorrelation characteristics of the soil property parameters are analyzed and studied deeply. In this paper, the number and scope of samples collected are not enough, and the results are uncertain.
【学位授予单位】：浙江海洋大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU447

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