| 本文已被：浏览 1095次 下载 781次 |
码上扫一扫！ |
|
|
| 海底管线维护中底床表层稳定粗化层的构建 |
|
李近元1,2,3, 马小川4, 阎军4
|
|
1.中国地质大学(北京) 海洋学院, 北京 100083;2.国电新能源技术研究院海洋地质与水文研究室, 北京 102209;3.中能电力科技开发有限公司, 北京 100034;4.中国科学院海洋研究所, 中国科学院海洋地质与环境重点实验室, 山东 青岛 266071
|
|
| 摘要: |
| 以东方岸外海域为例，计算了极端天气下不同水深条件构建稳定粗化层抛石颗粒的临界粒径；分析了影响粗化层稳定的不同因素，并对人工抛石构建粗化层提出建议。结果显示，在东方岸外30 m和60 m水深处，沉积物的中值泥沙粒径至少为30.33 mm和3.99 mm，才能抵御极端浪流的冲刷，且抛石层的厚度应至少为80.9 mm和10.8 mm，抛石层至少覆盖原始床沙的70%。粗化层的稳定性受颗粒隐蔽暴露效应、砂组分百分比、粗化层颗粒级配、覆盖厚度及覆盖百分比的共同影响，而抛石构建稳定粗化层的实质是对抛石粒径的合理选取及对细粒组分百分比的有效控制。另外，抛石级配的合理选择应受到重视，在施工过程中则需保证覆盖百分数和粗化层的覆盖厚度。粗细混合投放或者分层投放有利于更好地构建稳定粗化层。以上述方法构建稳定粗化层可为海底管道工程设施的维护提供有效支持。 |
| 关键词: 粗化层 隐蔽暴露效应 抛石方法 海底管线 |
| DOI：10.11759/hykx20170922001 |
| 分类号:P756 |
| 基金项目:国家自然科学基金（41406061） |
|
| Construction of stable armoring layers on seabed during submarine pipeline maintenance |
|
LI Jin-yuan1,2,3, MA Xiao-chuan4, YAN Jun4
|
|
1.School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083, China;2.Marine Geology and Hydrology Research Laboratory, Guodian New Energy Technology Research Institute, Beijing 102209, China;3.Zhong Neng Power-Tech Development Company Limited, Beijing 100034, China;4.CAS Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
|
| Abstract: |
| Taking the case of the area offshore Dongfang in Hainan Island, the present study calculates the critical diameter of grain in critical armoring layer. Factors influencing the stability of armoring layer are discussed and suggestions on construction of stable armoring layer are proposed. The results show that at the depth of 30 m and 60 m offshore Dongfang, 30.33 mm and 3.99 mm of the diameters of grain are required to resist scouring, and the thicknesses of riprap layer are at least 80.9 mm and 10.8 mm, respectively. The percentage of riprap needs to reach more than 70%. Stability of riprap layer is affected by hiding-exposure effect, sand content, gradation composition, thickness of layer, and overlay ratio. Essence of building stable riprap layer is the selection of the critical grain size and the amount of the fine content. Moreover, right gradation composition should be determined reasonably when choosing riprap, otherwise. The thickness and the overlay ratio of riprap layer need be sufficient during project operating. Mixing large and medium grain or layering riprap dumping should be better to build stable armoring layer. Such a method to build stable riprap layer can efficiently support the maintenance of submarine piplines. |
| Key words: armoring layer hiding-exposure effect stone dumping submarine pipeline |