Study on wave-influenced resistance to erosion of silty soil in Huanghe (Yellow) River Delta
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Study on Wave-influenced resistance to erosion of silty soil in Huanghe (Yellow) River Delta QIN Hao1∗ , CHEN Fang1 , LIU Yalin2 1
Research Center of Geotechnical and Structural Engineering, Shandong University, Shandong 250061, China
2
Marine Environmental Monitor Center of Wenzhou, Zhejiang 325027, China
Received 11 December 2008; accepted 7 April 2009 c The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2010
Abstract Along with the reduction of sediment yield of the Huanghe (Yellow) River, the erosion of the Huanghe River Delta aggravates, which has becomes an important factor that threatens the coastal protection structures. Starting from the study of the erosion resistibility of the sediment, this paper explores the internal mechanism of erosion phenomenon. This paper takes Diaokou as the study area and takes soils as samples which are mixed with clay into reconstructed samples whose ratio of clay content are 5%, 10%, 15%, 20% respectively, then dynamic tri-axial apparatus is applied to simulate wave loads of different intensity; then the resistibility of soil to erosion is determined via concentrated flow test and the structural property is determined via the disintegration test. Finally, the resistibility to erosion and the structural property of the non-compressed soil samples are compared with the compressed data. The results indicates that liquefaction failure exerts significant influence on the resistibility to erosion and the structural property of the silty soil in the Huanghe River Delta. Therefore, in the future erosion studies, the liquefaction phenomenon shall be fully considered. Key words: wave load, resistance of soils to erosion, disintegration test, liquefaction
1 Introduction Coastal zone and delta zone carries the world’s most developed economy and also the most complex geological environment dynamic systems. In this region, a very prominent problem is the erosion problem. The second largest oil field of China, Shengli oilfield, is located at the Huanghe (Yellow) River Delta, whose oil-bearing areas are mainly in the ocean-oriented part of the delta. The production of petroleum is in the intersection where land and ocean overlap. In recent decades, with the frequent cutoff of the Huanghe River, the sediment flux into the sea has dramatically reduced to 20% of that in the 1950s, and the Huanghe River Delta has changed from the annual average landmaking of 23 km2 in the past to the annual average erosion recession of 7.2 km2 at present, for example, 70% of the oil wells located at Feiyantan which submerge while in high tide. Erosion has greatly increased the cost of petroleum exploitation. The two most significant wave-induced performances of soil are erosion and liquefaction respectively. Therefore researchers’ interest focuses on these two as∗ Corresponding
author, E-mail: [email protected]
pects. For erosion research, two parameters express the soil resistibility to erosion forces applied by concentrated runoff: soil erodibility during concentrated flow KC and critical
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