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Microstructure Features and the Macroscopic Acoustic Behavior of Gassy Silt in the Yellow River Delta

Journal of Ocean University of China 2024年第2期23卷 371-382页

作者： LIU Tao GUO Zhenqi ZHANG Yan WU Chen LIU Lele deng shenggui Laboratory for Marine Geology Pilot National Laboratory for Marine Science and TechnologyQingdao 266061China Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China College of Civil Engineering Anhui Jianzhu UniversityHefei 230601China The Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China College of Marine Geosciences Key Laboratory of Submarine Geosciences and ProspectingOcean University of ChinaQingdao 266100China

The morphological changes in isolated bubbles in gassy silt play a critical role in the microscopic structures between soil particles and bubbles and macroscopic physical *** on X-ray CT scanning experiments under various vertical loads(four levels),self-designed acoustic macro experiments,and a series of formula revisions to the macro-air-bearing silt sound-velocity prediction model,this paper discusses the macro-and micro-scale features of gassy silts from the Yellow River *** samples consisted of different proportions of silt from the Yellow River Delta and porous media,and they were used to form two types of aerosol silts with initial gas contents of 4.23%and 7.67%.The results show that the air bubble content and external load considerably affect the microstructural parameters and acoustic behavior of gassy silt in the Yellow River *** macroscopic sound velocity showed a linear positive correlation with vertical load and relation to microstructural parameters in varying manners and *** on the traditional Biot-Stoll acoustic model,the gas-phase medium coefficient was introduced for the proper calculation and prediction of the sound velocity of air-bearing *** errors of the overall prediction varied between 5.6%and 9.6%.

关键词： gassy silt vertical load microstructure parameters bubble vibration Biot-Stoll acoustic model

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OPC-MCA固化剂对盾构废泥的固化性能及其微观作用机制研究

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中南大学学报（自然科学版） 2024年第4期55卷 1492-1508页

作者：张恒根王卫华邓声贵何昊刘涛山东省海洋环境与地质工程重点实验室中国海洋大学山东青岛266100 中南大学资源与安全工程学院湖南长沙410083 中国海洋大学海洋地球科学学院山东青岛266100 青岛海洋科技中心海洋地质过程与环境功能实验室山东青岛266237

通过添加高炉矿渣(GGBS)、脱硫石膏(FGDG)、铝酸钙粉、生石灰和明矾到普通硅酸盐水泥P.O42.5(OPC)中,制备一种新型盾构废泥改良材料OPC-MCA。首先,通过正交测试法确定OPC-MCA中各原料的最优配比。然后,使用该材料和OPC在10%~40%的掺量... 详细信息

通过添加高炉矿渣(GGBS)、脱硫石膏(FGDG)、铝酸钙粉、生石灰和明矾到普通硅酸盐水泥P.O42.5(OPC)中,制备一种新型盾构废泥改良材料OPC-MCA。首先,通过正交测试法确定OPC-MCA中各原料的最优配比。然后,使用该材料和OPC在10%~40%的掺量下处理芜湖市城南过江隧道工程产生的盾构废泥,并检测不同固化时间(3、7、28 d)下的抗压强度。最后,采用扫描电镜(SEM)、工业CT系统和X射线衍射(XRD)观察和分析固化后废泥试样的微观形貌、孔隙和裂纹特征以及矿物成分变化。研究结果表明:OPCMCA的最优材料配比为51%OPC、32%GGBS、8%FGDG、5%铝酸钙粉、3%生石灰、1%明矾;OPCMCA对芜湖盾构废泥的固化能力比OPC的强,在低掺量情况下更是如此;固化剂掺量和固化时间的增加会导致试样强度增加、脆性增强,并使部分试样转变为拉伸破坏;在OPC-MCA固化的试样中检测到了OPC固化试样中未检测到的水化硅铝酸钙(C-A-S-H)和单硫型硫铝酸盐(AFm),并且钙矾石(AFt)含量也更高;在同等掺量下,OPC-MCA固化试样中大尺寸孔隙的比例以及孔隙的总体积均比OPC固化试样的小。

关键词：盾构废泥固化剂 CT扫描力学性能反应机理

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Factors Influencing the Thermal Conductivity of Silt in the Yellow River Delta

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Journal of Ocean University of China 2023年第4期22卷 1003-1011页

作者： YANG Xiuqing deng shenggui GUO Lei ZHANG Yan LIU Tao College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China College of Marine Geosciences Ocean University of ChinaQingdao 266100China Institute of Marine Science and Technology Shandong UniversityQingdao 266237China College of Civil Engineering Anhui Jianzhu UniversityHefei 230000China Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Qingdao 266100China Qingdao National Laboratory of Marine Science and Technology Qingdao 266100China

The thermal conductivity of marine sediments is an important thermophysical parameter in the study of seafloor heat flow and marine engineering *** the effect of thermal conductivity of marine sediments in the environment has a major engineering value and theoretical *** this work,a modified test method was used to measure the thermal conductivity of silt in the Yellow River Delta under different void ratios,moisture contents,temperatures,and *** showed that the thermal conductivity of silt in the Yellow River Delta decreased with the increase in the void ratio and increased with the water *** with sand and clay,silt in the Yellow River Delta was the least affected by the void ratio and moisture *** low temperatures,the heat transfer of soil was controlled by the average velocity of the phonons;therefore,the thermal conductivity of silt in the Yellow River Estuary increased with *** thermal conductivity of pore water decreased with increasing ***,certain salinity levels resulted in a phenomenon known as the‘compressing twin electrical layer’,which led to an increase in the contact area between soil *** the increase in salinity,the thermal conductivity of silt in the Yellow River Delta experiences an initial decline and a subsequent *** proposed thermal conductivity test method is more accurate than the existing technique,and the findings provide a basis for further study on the thermal characteristics of submarine sediments.

关键词： silt in the Yellow River Delta thermal conductivity void ratio water content temperature salinity

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Study on strength properties and soil behaviour type classification of Huanghe River Delta silts based on variable rate piezocone penetration test

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Acta Oceanologica Sinica 2023年第11期42卷 146-158页

作者： Yunuo Liu Guoqing Lin Yan Zhang shenggui deng Lei Guo Tao Liu Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Lab of Submarine Geosciences and Prospecting Techniques MOE China Ocean University of ChinaQingdao 266100China College of Marine Geosciences Ocean University of ChinaQingdao 266100China Institute of Marine Science and Technology Shandong UniversityQingdao 266237China Qingdao National Laboratory for Marine Science and Technology Qingdao 266100China

Fine-grained silt is widely distributed in the Huanghe River Delta(HRD)in China,and the sedimentary structure is complex,meaning that the clay content in the silt is *** piezocone penetration test(CPTu)is the most widely approved in situ test *** can be used to invert soil properties and interpret soil *** analyse the strength properties of surface sediments in the HRD,this paper evaluated the friction angle and its inversion formula through the CPTu penetration test and monotonic simple shear test and other soil unit *** evaluation showed that the empirical formula proposed by Kulhawy and Mayne had better prediction and inversion *** HRD silts with clay contents of 9.2%,21.4%and 30.3%were selected as samples for the CPTu variable rate penetration *** results show as follows.(1)The effects of the clay content on the tip resistance and the pore pressure of silt under different penetration rates were *** tip resistance Q_t is strongly dependent on the clay content of the silt,the B_(q)value of the silt tends to 0 and is not significantly affected by the change of the CPTu penetration rate.(2)Five soil behavior type classification charts and three soil behavior type indexes based on CPTu data were *** results show that the soil behavior type classification chart based on soil behavior type index ISBT,the Robertson 2010 behavior type classification chart are more suitable for the silty soil in the HRD.

关键词： Huanghe River Delta piezocone penetration test silty soils clay content friction angle soil behaviour type classification

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Arctic oscillation and the antarcic oscillation modes in the atmospheric stratosphere

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Acta Oceanologica Sinica 2005年第6期24卷 46-53页

作者： QU Weizheng HUANG Fei ZHAO Jinping YANG Liang HE Hui deng shenggui CAO Yong Physical Oceanography Laboratory Ocean University of ChinaQingdao 266003China

On the basis of the EOF analysis of global geopotential height anomaly(GHA)field at 10 hPa level,the arctic oscillation(AO)and the means antarctic oscillation(AAO)can bedetected more obviously at the upper level of atmosphere than the AO or the AAO in surface *** the hemisphere pattern of the AO and the AAO in the surface lager given by previous authors,the AO or the AAO in the stratosphere has its global *** zonal oscillations—the SouthernOscillation(SO)and the north oscillation(NO)in atmospheric surface layer become less clear inthe upper *** first mode(AO mode,abbreviated to AOM hereafter)and the second mode(AAO mode,abbreviated to AAOM hereafter)respectively have 41.47%and 27.04%of the total *** cumulative variance contribution of the first two modes reaches 68.51%.These twomodes are the main components for the interdecadal or decadal oscillation in the ***,there still exist two kinds of oscillation patterns with less probability,namely,thesymmetric pattern at mid-high latitudes in the Southern Hemisphere and the asymmetric *** analysis shows that the AOM and the AAOM all have a spectral peak for 22 a period,beingconsistent with the periodic variations of the solar magnetic field,and a peak for 11 a period,being consistent with the period of the numbers of *** filter analysis shows that theinfluencing factor for the upper atmospheric oscillation is the solar *** fluctuation ofthe solar magnetic field is the more influencing factor than the variation of the sunspot number.

关键词： solar activity arctic oscillation antarctic oscillation stratosphere

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Microstructure Features and the Macroscopic Acoustic Behavior of Gassy Silt in the Yellow River Delta

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中国海洋大学学报（自然科学英文版） 2024年第2期

作者： LIU Tao GUO Zhenqi ZHANG Yan WU Chen LIU Lele deng shenggui

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The coastal erosion and evolution of the Yellow River Delta abandoned lobe

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Journal of Geographical Sciences 2004年第4期14卷 465-472页

作者：李安龙李广雪曹立华 Zhang Qingde deng shenggui Institute of Estuarine and Coastal Studies Ocean University of ChinaQingdao 266003China Shandong Province Key Laboratory of Submarine Resource and Exploring TechnologyQingdao 266003China Institute of Estuarine and Coastal Studies Ocean University of ChinaQingdao 266003China

A statistic analysis predicting coastal change of the Yellow River abandoneddelta lobe formed from 1964 to 1976 using Landsat TM imagery was conducted by calculating thecoastal erosion/accumulation rates obtained from four different classic profiles and plotting thechange curves of coastline with time. The studies showed that the regularity of the evolution of thecoastline was very obvious after the delta lobe was abandoned. The coastal evolution can be dividedinto three different phases: erosion phase, transition phase and cyclical change phase. At present,the coast has evolved to the cyclical change phase. The natural coastline change cycle is 4 yearsbetween the dam and is 5 years to the west of the dam. In the cyclical change phase, thequasi-equilibrium line of the coast was located near the coastline of 1996, the current coast mayrecede 1.79 km to reach the natural equilibrium coastline. Therefore, some measures must be taken toprotect the dam or the dam will be destroyed by the force of nature. The curves also revealed themagnitude of erosion/accumulation rates would decrease gradually with time. The results of the studyoffer guidance for coast protection, and proves that the evolution of silty coast actually was acyclical change process too.

关键词： landsat TM remote sensing yellow river delta coast erosion erosionquasi-equilibrium line

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