黏性土淹没射流破土实验研究

doi:10.3969/j.issn.1001-909X.2019.01.009

海洋学研究 ›› 2019, Vol. 37 ›› Issue (1): 67-74.DOI: 10.3969/j.issn.1001-909X.2019.01.009

黏性土淹没射流破土实验研究

郑健, 来向华, 陈小玲, 李冬

自然资源部第二海洋研究所, 浙江杭州 310012

收稿日期:2018-11-05 修回日期:2018-12-24 出版日期:2019-03-15 发布日期:2022-11-21
作者简介:郑健(1993-),男,江苏灌云县人,主要从事岩土工程方面的研究。E-mail:damingzt92@163.com
基金资助:
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)

Experimental research on mechanism of soil breaking by submerged jets in clay

ZHENG Jian, LAI Xiang-hua, CHEN Xiao-ling, LI Dong

Second Institute of Oceanography, MNR, Hangzhou 310012, China

Received:2018-11-05 Revised:2018-12-24 Online:2019-03-15 Published:2022-11-21

摘要/Abstract

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。

关键词: 淹没射流, 开沟, 地基土承载力

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.

Key words: submerged jet, trenching, bearing capacity

中图分类号:

P754

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.

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.

参考文献

[1] RAJARATNAM N, BELTAOS S. Erosion by impinging circular turbulent jets[J]. Journal of the Hydraulics Division, 1977, 103(10):1 191-1 205.
[2] MAZUREK K A,HOSSAIN T.Scour by jets in cohesionless and cohesive soils[J].Canadian Journal of Civil Engineering,2007,34(6):744-751.
[3] MAZUREK K A,RAJARATNAM N,SEGO D C.Scour of cohesive soil by submerged circular turbulent impinging jets[J].Journal of Hydraulic Engineering,2001,127(7):598-606.
[4] DUNN I S. Tractive resistance of cohesive channels[J]. Journal of Soil Mechanics and Foundation Division, ASCE, 1959, 85: 1-24.
[5] NOBEL A J, TALMON A M, VLASBLOM W J. Cavitating jets for dredging clay[C]//The 17th International Conference on the Hydraulic Transport of Solids, 7-10 May, 2007, Cape Town, South Africa.
[6] HO C E. Turbulent fluid jet excavation in cohesive soil with particular application to jet grouting[D].Massachusetts: Massachusetts Institute of Technology, 2005.
[7] MACHIN J, MESSINA F, MANGAL J, et al. Recent research on stiff clay jetting[C]//Offshore Technology Conference, 2001.
[8] GU Lei, NI Fu-sheng, ZHANG Hao. Numerical calculation of jet scouring in sand and clay based on ALE method[J]. Science and Technology and Engineering, 2017, 17(11):103-107.
顾磊, 倪福生, 张浩. 基于ALE方法的射流冲刷砂土和黏土的数值计算[J]. 科学技术与工程, 2017, 17(11):103-107.
[9] ZHANG Shu-sen. Experimental research on trenching in stiff clay by submerged vertical traveling jets[J]. Journal of Coastal Research, 2016, 32(2):365-373.
[10] MA Fei, SONG Zhi-hui. Dynamic characteristics of water jet flow and the failure mechanism of soils[J]. Journal of University of Science and Technology Beijing, 2006,28(5):413-416.
马飞,宋志辉.水射流动力特性及破土机理[J].北京科技大学学报,2006,28(5):413-416.

黏性土淹没射流破土实验研究

Experimental research on mechanism of soil breaking by submerged jets in clay

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