| 黏性土淹没射流破土实验研究 |
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| 引用本文： | 郑健,来向华,陈小玲,李冬.黏性土淹没射流破土实验研究[J].海洋学研究,2019,37(1):67-74. |
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| 作者姓名： | 郑健 来向华 陈小玲 李冬 |
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| 作者单位： | 自然资源部 第二海洋研究所,浙江 杭州,310012;自然资源部 第二海洋研究所,浙江 杭州,310012;自然资源部 第二海洋研究所,浙江 杭州,310012;自然资源部 第二海洋研究所,浙江 杭州,310012 |
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| 基金项目： | 国家自然科学基金项目资助(5167090521);浙江省电力有限公司基金项目资助(5211ZS16000C) |
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| 摘 要： | 海底水力喷射开沟技术在海底管道、光缆埋设等工程中得到广泛应用,然而黏土尤其是硬质黏性土中的水力开沟施工较为困难,为阐明其中的破土机制,开展了二维垂向淹没射流开沟物理模拟实验。通过观察射流破土的过程,发现:软黏土与硬质黏性土中冲坑发展的特点有所不同,破土机制也存在差异。射流对硬质黏性土的破坏中,压力导致的剪切破坏起到很大作用,在土力学原理上近似于地基土整体剪切破坏,据此建立了硬质黏性土射流破土模型,同时提出冲坑颈口直径在硬质黏性土冲坑形态中的重要性,并以此取代原有的冲坑直径作为一个预测指标。
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| 关 键 词： | 淹没射流 开沟 地基土承载力 |
| 收稿时间： | 2018-11-05 |
Experimental research on mechanism of soil breaking by submerged jets in clay |
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| ZHENG Jian,LAI Xiang-hua,CHEN Xiao-ling,LI Dong.Experimental research on mechanism of soil breaking by submerged jets in clay[J].Journal of Marine Sciences,2019,37(1):67-74. |
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| Authors: | ZHENG Jian LAI Xiang-hua CHEN Xiao-ling LI Dong |
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| Affiliation: | Second Institute of Oceanography, MNR, Hangzhou 310012, China |
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| Abstract: | Hydraulic jet trenching technology has been widely used in submarine pipeline and optical cable embedding engineering. However, jet trenching construction in stiff clay is difficult. In order to elucidate the mechanism of soil breaking, the physical simulation experiment of submerged vertical jet trenching was carried out. During the process of soil breaking, it is found that there are some differences between the development characteristics of scour hole in soft clay and stiff clay. Shear-compression stress is the main factor of soil breaking in stiff clay and the breaking mode in stiff clay can be explained by the Prandtl foundation ultimate bearing capacity theory. Based on this, the model of jet to break hardpan is established, and the diameter of hole's neck is proposed to replace the diameter of scour hole as a prediction index. |
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| Keywords: | submerged jet trenching bearing capacity |
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