论文总字数：41943字

摘 要

在国内的工程建设的过程中，软土导致的问题十分普遍的。正是由于高含水率、高压缩性、抗剪强度低等不良的物理力学特性，软土的处理成为建设施工的关键。因此，研究、分析、探讨软土地基的土性指标的规律，对于了解软土的工程特性，保证设计用的各项物理力学性质指标的正确性，具有十分重要的实际意义。本文以连云港S226省道沿线软土作为研究依托，通过对S226省道沿线钻孔的土样进行室内土工试验和原位试验，得到大量的数据。利用origin等分析软件对数据进行数理统计分析，并且通过回归分析的方法，找到了软土指标之间的关系。若将这些规律用于工程建设，可以起到一定的指导意义。主要研究内容包括以下几点：

• 1. 软土物理力学指标统计分析，主要分析的指标包括含水量、干密度、土粒比重、孔隙比、液限、塑限、塑性指数、液性指数、压缩系数、压缩模量、内摩擦角、粘聚力。统计各个指标的均值、标准差、变异系数以及变化范围，并且探究各个土层的指标差异的原因。
  2. 分别对物理指标间以及物理指标与力学指标进行线性回归分析，得到了拟合方程，并且通过相关系数R²判断指标之间相关性的强弱，可作为经验公式应用于连云港地区的工程实践应用中。
  3. 将S226省道沿线分为三段，分段统计各个区段内的物理力学指标，作出了每个区段的各指标的箱形分布图，探究物理力学指标在沿线方向上的变化规律。同样，沿深度方向上，以一定距离分段，作出了每个分段内各指标的平均值的折线图，探究其随着深度的变化规律。
  4. 统计了十字板剪切实验数据，作出了抗剪强度与灵敏度沿深度的变化图，并且通过线性回归的方法拟合抗剪强度与灵敏度和深度的关系式。抗剪强度与深度的关系式可用于工程地基强度的预测。
  5. 按照土层类别分类，统计各种土层的静力触探参数的变化范围，包括锥尖阻力、侧摩阻力以及摩阻比。探究了静力触探指标与软土可塑性之间的关系。
  6. 按连云港地区的自然地理与地质条件，对连云港地区进行工程地质区域划分，并对每个工程地质区域提出合适的开发模式。

关键词：物理力学指标、数理统计、回归分析、静力触探、地质区划

Abstract

During the construction of today, the problem of soft soil is very normal. Due to the adverse physical and mechanical properties of soft soil, such as the high water content, high compressibility, low shear strength and so on, the treatment has become a major problem in the construction process need to be addressed. Therefore, researches, analysises, investigates about the properties’ indexs of soft soil have a very important practical significance to understand the natural properties of soft soil and the correctness of the physical and mechanical properties of soft soil provided for designs. In this paper, Lianyungang soft soil along the provincial highway S226 as a research-based, through the area of soil samples were extracted and test indoor or in situ directly, then get a large amounts of data. The use of origin and other analysis software for data analysis and mathematical statistics, and the establishment of appropriate mathematical model, the laws can be found in soft soil metrics or between the metrics. These laws will be used to guide the construction will greatly reduce the workload and unknown factors engineering.

The main include the following:

1. soft soil physical and mechanical indicators statistical analysis, the main analysis of indicators, including water content, dry density, Specific Gravity, void ratio, liquid limit, plastic limit, plasticity index, liquidity index, compressibility, compression modulus, within friction angle, cohesion. Mean, standard deviation, coefficient of variation and the range of each index will be calculated to explore the causes of differences between the various indicators of soil.
2. respectively, the physical indicators and physical indicators, indicators of physical and mechanical indicators can be linear regression analysis, then get the regression equations. And the correlation coefficient R2 is determined by the strength of the correlation between the index . the equations can be applied as an empirical formula for Lianyungang region engineering practice.
3. along the provincial highway S226 will be divided into three segments, each segment statistical physics and mechanics indexes within the sector, and the box-shaped profile made of each index for each zone, to explore changes in the physical and mechanical properties along the direction. Similarly, along the depth direction, at a distance segment, making each segment of each index average line chart, explore its variation with depth.

(4) statistics vane shear test data, make a diagram shear strength, sensitivity and depth, and the fitting relationship shear strength and sensitivity and depth by linear regression method. The relationship of the shear strength can be used to predict ground engineering strength.

(5) in accordance with the soil classification, statistical range of static cone penetration parameters of various soil, including tip resistance, lateral friction and friction ratio. And then explore the relationship between static sounding and soft soil plasticity index between.

(6) according to the natural geography and geographical conditions of the region Lianyungang, Lianyungang can be divided into several engineering geological areas, and make appropriate development model for each engineering geological region.

KEY WORDS： physical and mechanical properties，mathematical statistics，regression analysis，static sounding， geological zoning

目 录

摘 要 4

Abstract 5

第一章 绪论 9

1.1 引言 9

1.2 国内外现状 10

1.2.1 软土的物理性质 10

1.2.2 软土的力学变形性质 10

1.2.3 软土的矿物成分以及颗粒组成分析 11

1.2.4 小结 12

1.3 本文研究思路和研究路线 12

第二章 连云港地区软土的工程条件 13

2.1 软土及其分布 13

2.2 研究区工程地质条件 14

2.2.1 地层情况及其成因 15

2.2.2 研究的软土类型 18

2.3 物理、力学指标的联系及分析方法 20

2.3.1 物理力学指标的联系 20

2.3.2 物理力学指标具体的统计研究分析方法 20

2.4 本章小结 21

第三章 连云港地区软土物理力学统计分布规律 22

3.1 地质数据的特点 22

3.2 软土物理力学性质参数分析 23

3.3 软土物理力学参数一元回归分析 26

3.3.1 物理指标之间相关分析 26

3.3.2 物理力学指标之间的拟合方程 32

3.4 本章小结 36

第四章 连云港地区软土工程性质的变化规律 38

4.1 物理力学指标沿线方向分布规律 38

4.1.1 物理指标沿线变化情况 38

4.1.2 力学指标沿线变化情况 41

4.2 物理力学指标沿深度的变化规律 42

4.2.1 物理指标沿深度变化情况 42

4.2.2 力学指标沿深度变化情况 44

4.3本章小结 45

第五章 连云港地区土层的十字板剪切实验参数 46

5.1抗剪强度沿深度的变化规律 46

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