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An analysis of soil composition and mechanical properties of riverbanks in a braided reach of the Lower Yellow River

ISSN号：1673-9264
期刊名称：《中国防汛抗旱》
时间：0
分类：P942[天文地球—自然地理学]
作者机构：[1]State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China, [2]Yellow River Institute of Hydraulic Research, YRCC, Zhengzhou 450003, China
相关基金：Supported by the National Natural Science Foundation of China （Grant No. 50409002）, the Ministry of Science and Technology of China under the frame of Program Strategic Scientific Alliances between China and the Netherlands （Grant No. 2004CB720402） and the National Natural Science Foundation of China for Creative Research Groups （Grant No. 50221903）

作者： XlA JunQiang[1], WU BaoSheng[1], WANG YanPing[2], ZHAO ShouGang[2]

关键词：黄海, 土壤分析, 河堤侵蚀, 化学物质, Lower Yellow River, braided reach, riverbank erosion, riverbank-soU composition, mechanical properties, erosion-resistant strength, shear strength

中文摘要：

在一个编织活动范围的隧道调整在更低的黄河，河岸侵蚀的过程在起一个重要作用的河的过程是很突出的，特别在搜索的清楚的水的时期期间。河岸侵蚀的过程是仔细与土壤作文和河岸的机械性质有关。在这篇论文，在在 Huayuankou 和 Gaocun 之间的一个编织活动范围的最近的河岸侵蚀过程第一在水被坝所围住的水和 Xiaolangdi 水库，然后地观察的沉积拘留以后被调查，室内的土壤测试在编织活动范围在 10 条典型河岸被进行。通过分析试验性的结果，作文和机械性质被发现的河岸土壤的变化，和在编织活动范围引起严肃的河岸侵蚀的二个真实原因被识别。下列结论从这研究被得出：河岸的多数由连贯的土壤组成的(i) ，和罐头被土壤作文的明显的垂直层化结构描绘；( i i )这些河岸是很 erodible 由于在河岸土壤的更低的泥土内容和弱侵蚀抵抗的强度，与它的批评砍多是的应力价值( 0.1-0.3 Pa )不到平均近银行的流动的砍应力( 2.0-3.0 Pa )，它是引起严肃的河岸侵蚀的一个重要原因；( iii )河岸失败的经常的出现通常在洪水季节期间源于事实价值砍象有在河岸的水内容的增加的结合和内部磨擦角度减少那样的力量参数玷污，并且结合的价值随水的增加从 34～4 kPa 急速地减少满足在编织活动范围引起严肃的河岸侵蚀的重要理智，它是另外一个。

英文摘要：

The channel adjustment in a braided reach is very prominent in the fluvial processes of the Lower Yellow Rlver, In whlch the process of bank erosion plays an important role, especially durlng the perlod of clear water scourlng. The process of bank erosion is closely related to soil composition and mechanlcal properties of the riverbanks. In this paper, the recent bank erosion process in a bralded reach between Huayuankou and Gaocun was firstly investigated after the water impoundment and sediment detentlon of the Xlaolangdi Reservoir, and then a field observation and indoor soil testa were conducted at 10 typlcal riverbanks in the braided reach. Through analyzing the experlmental results, changes of t;brtnsml-soo; composition and mechanical properties were found, and the two real reasons causlng serlous bank erosion in the braided reach were identified. The following conclusions were drawn from thls study：（i） the majority of riverbanks are made up of cohesive soil, and can be characterlzed by obvlous vertlcal stratification structures of soil composition; （ii） these riverbanks are very erodlble due to the lower clay-content and weak erosion-resistant strength in the bank soil, wlth its crltlcal shear stress value （0.1-0.3 Pa） being much less than that of the average near-bank flow shear stress （2.0-3.0 Pa）, which is one important reason causing serious bank erosion; （iii） frequent occurrence of bank fallure during flood seasons usually results from the fact that the values of shear strength parameters such as the cohesion and internal friction angle decrease with the increase of water content In riverbank soil, and the value of cohesion reduces drastically from 34 to 4 kPa wlth the Increase of water content, which is another important reason causing serious bank erosion in the bralded reach.

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