南海和阿拉伯湾钙质砂工程特性对比研究

李怀亮; 黄山田; 王晓飞; 李飒; 戴旭

doi:10.16562/j.cnki.0256-1492.2018.02.007

南海和阿拉伯湾钙质砂工程特性对比研究

1.
中海油安装公司，天津 300456

2.
天津大学建筑工程学院，天津 300072

基金项目:
国家自然科学基金重点项目“复杂环境下深海工程结构动力特性与安全可靠性研究”(51239008);国家自然科学基金“基于温变条件下深海管土耦合作用及其破坏机理研究”(51379145);高技术船舶科研计划“浮式保障平台工程”2016[22]

详细信息

作者简介: 李怀亮(1975—)，男，高工，主要从事海上构筑物的建造，运输，安装等方面的工作，E-mail:1805127265@qq.com

中图分类号: TU449

蔡秋蓉编辑

收稿日期: 2016-07-18

修回日期: 2017-04-21

刊出日期: 2018-04-28

Comparison of engineering characteristics of calcareous sands in the South China Sea and Arabian Bay

1.
The installation branch of Offshore Oil Engineering Co., Ltd., Tianjin 300456, China

2.
Department of Civil Engineering, Tianjin University, Tianjin 300072, China

Received Date: 18 July 2016

Revised Date: 21 April 2017

Publish Date: 28 April 2018

摘要

摘要:
钙质砂在我国南海有广泛的分布。随着海上石油工业和海洋资源的开发利用，钙质砂问题日益得到重视。用室内试验的方法，采用相同级配的南海钙质砂和阿拉伯湾钙质砂进行了分析，结果显示，相同级配的南海钙质砂和阿拉伯湾钙质砂的最大最小干密度存在明显差异，南海钙质砂均低于阿拉伯湾钙质砂。同时在级配以及密实度相同的条件下，南海钙质砂的应力-应变关系表现为硬化，而阿拉伯湾钙质砂表现为软化; 两者在Dr=0.3时，内摩擦角接近，均为33°左右，但随着相对密实度的增加，南海钙质砂内摩擦角增长速度更快，在Dr=0.8时达到37.7°，明显高于相同密实度的阿拉伯湾钙质砂的34.9°。电镜分析显示，在微观结构上，南海钙质砂的颗粒多棱角，内孔隙更加发育，这是造成南海钙质砂与阿拉伯湾钙质砂物理力学性质差异的重要原因之一。
- 钙质砂 /
- 物理力学性质 /
- 南海 /
- 阿拉伯湾
Abstract:
Calcareous sand is widely spread in the South China Sea. As a special type of soil, its physical and mechanic properties vary from place to place, that always bring troubles to engineers to determine the parameters for design. With the rapid development of ocean engineering, this problem has caught great attention in practice. In this paper, the physical and mechanic properties of calcareous sand from the South China Sea and Arabian Bay are studied by indoor tests. The results show that under the same particle gradation, the dry unit weight of the sands in Arabian Bay is higher than that in South China Sea, if they have same relative density. The relationship of stress-strain exhibits soften for Arabian Bay sand and stiffen for the South China Sea sand. When relative density Dr=0.30, the friction angle of calcareous sand in the South China Sea and Arabian Bay is about 33°. However, with the increment in Dr, the friction of South China sand increases faster than that of Arabian Bay sand. When Dr=0.80, the friction angle of calcareous sand in the South China Sea is up to 37.9°which is greater than 34.9° of Arabian Bay sand obviously. The results of scanning electron microscope (SEM) reveal that the inner pore of calcareous sand in the South China Sea is more developed, and the particles have higher angularity. These characteristics should be taken into account when building platform on calcareous sands in practice.
- calcareous sand /
- physical and mechanical properties /
- the South China Sea /
- Arabian Bay

HTML全文

图 1 各地区钙质砂的密度

Figure 1.

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图 2 各地区钙质砂的最大孔隙比

Figure 2.

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图 3 各地区钙质砂的最小孔隙比

Figure 3.

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图 4 阿拉伯湾和南海钙质砂的颗粒级配曲线

Figure 4.

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图 5 各地区钙质砂的内摩擦角

Figure 5.

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图 6 钙质砂的应力-应变关系曲线(Dr=0.68)

Figure 6.

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图 7 钙质砂的应力-应变关系曲线(σ=400kPa)

Figure 7.

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图 8 钙质砂的内摩擦角与相对密实度的关系

Figure 8.

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图 9 剪切前后的颗粒级配曲线(σ=400kPa)

Figure 9.

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图 10 400kPa下南海钙质砂与阿拉伯湾钙质砂的破碎情况

Figure 10.

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图 11 钙质砂的微观结构

Figure 11.

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表 1 钙质砂最大最小干密度

Table 1. The maximum and minmum unit dry weight and void ratio of calcareous sand

试验项目	最小干密度/(g/cm³)	最大干密度/(g/cm³)	最大孔隙比	最小孔隙比
阿拉伯湾	1.522	1.806	0.820	0.534
南海	1.239	1.639	1.244	0.696

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