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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 properties.Based 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 Delta.The 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 Delta.The macroscopic sound velocity showed a linear positive correlation with vertical load and relation to microstructural parameters in varying manners and degrees.Based 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 silt.The 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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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 construction.Understanding the effect of thermal conductivity of marine sediments in the environment has a major engineering value and theoretical significance.In 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 salinities.Results 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 content.Compared with sand and clay,silt in the Yellow River Delta was the least affected by the void ratio and moisture content.Under 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 temperature.The thermal conductivity of pore water decreased with increasing salinity.Moreover,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 particles.With the increase in salinity,the thermal conductivity of silt in the Yellow River Delta experiences an initial decline and a subsequent increase.The 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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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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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 variable.The piezocone penetration test(CPTu)is the most widely approved in situ test method.It can be used to invert soil properties and interpret soil behavior.To 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 experiments.The evaluation showed that the empirical formula proposed by Kulhawy and Mayne had better prediction and inversion effect.The HRD silts with clay contents of 9.2%,21.4%and 30.3%were selected as samples for the CPTu variable rate penetration test.The 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 summarized.The 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 evaluated.The 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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黄河废弃三角洲叶瓣海岸侵蚀与岸线演化

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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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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 China Qingdao 266003 China Physical Oceanography Laboratory Ocean University of China Qingdao 266003 China Physical Oceanography Laboratory Ocean University of China Qingdao 266003 China Physical Oceanography Laboratory Ocean University of China Qingdao 266003 China Physical Oceanography Laboratory Ocean University of China Qingdao 266003 China Physical Oceanography Laboratory Ocean University of China Qingdao 266003 China Physical Oceanography Laboratory Ocean University of China Qingdao 266003 China

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 layer.Unlike 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 features. The zonal oscillations—the SouthernOscillation (SO) and the north oscillation (NO) in atmospheric surface layer become less clear inthe upper air. The 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 variancecontribution. The 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 stratosphere. Inaddition, 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 pattern.Spectral 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 sunspots. Step filter analysis shows that theinfluencing factor for the upper atmospheric oscillation is the solar activity. The 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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小庙岭选矿公司钼精矿降铜的工艺改造

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金属矿山 2010年第11期39卷 95-98页

作者：邓胜贵邓胜华栾川龙宇钼业有限责任公司小庙岭选矿公司华中农业大学

为有效降低钼精矿产品中铜含量和减少氰化钠的用量,以降低生产成本、减少环境污染,进行了钼精扫选浮选柱底流局部开路分流的工艺改造。生产实践表明,改造后钼精矿产品中铜含量均小于0.4%,完全达到合格产品的要求(≤0.5%),且氰化钠抑制... 详细信息

为有效降低钼精矿产品中铜含量和减少氰化钠的用量,以降低生产成本、减少环境污染,进行了钼精扫选浮选柱底流局部开路分流的工艺改造。生产实践表明,改造后钼精矿产品中铜含量均小于0.4%,完全达到合格产品的要求(≤0.5%),且氰化钠抑制剂用量也由原来的60g/t降低到30g/t。

关键词：钼精矿降铜工艺方差分析

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青海地区健康体检人群非酒精性脂肪性肝病的相关因素分析

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高原医学杂志 2023年第2期33卷 12-17页

作者：李莉祁生贵更登杨省燕解建敏青海省心脑血管病专科医院 810012

目的:分析海拔2000 m以上青海省健康体检人群非酒精性脂肪性肝病(nonalcoholic fatty liver disease,NAFLD)的检出率及危险因素。方法:2017年1月—2019年12月我院体检中心对青海省海拔2000 m~、3000 m~、4000 m~的7604例体检人群进行健... 详细信息

目的:分析海拔2000 m以上青海省健康体检人群非酒精性脂肪性肝病(nonalcoholic fatty liver disease,NAFLD)的检出率及危险因素。方法:2017年1月—2019年12月我院体检中心对青海省海拔2000 m~、3000 m~、4000 m~的7604例体检人群进行健康检查,比较不同性别、民族、海拔NAFLD的检出率,NAFLD组与非NAFLD组性别、海拔构成情况、体格检查指标、血生化检查指标,二分类Logistic回归确定其危险因素。结果:海拔2000 m以上地区NAFLD总检出率为37.1%,男性NAFLD检出率高于女性NAFLD检出率(P<0.05)。不同海拔组NAFLD检出率差异有统计学意义(P<0.05)。Logistic回归分析显示,海拔增高、男性、年龄增高、舒张压升高、体重指数升高、谷草转氨酶升高、谷丙转氨酶升高、甘油三酯增高、尿酸升高、葡萄糖升高是高原地区NAFLD发病的危险因素,而高密度脂蛋白胆固醇升高为其保护因素。结论:NAFLD在高原地区存在较高的检出率,高原地区NAFLD的发病与海拔、年龄、性别、血压及各类代谢异常有关。环境低氧可能参与了高原地区NAFLD的发生和发展。

关键词：非酒精性脂肪性肝病高原危险因素检出率

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澳洲某磁铁精矿可选性研究及实践

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矿业工程 2022年第6期20卷 25-28页

作者：朱辛州黄雄飞华嵩邓胜贵扬州泰富特种材料有限公司江苏扬州225000

澳洲进口的某磁铁精矿产品因其全铁含量相对较低、二氧化硅含量相对较高,必须经过磁选工艺再选才可作为球团原料使用。磁铁精矿再选需要对进口物料进行事先的可选性预测,而传统矿物加工学理论如物相分析、筛分分析、磁性质分析、扫描电... 详细信息

澳洲进口的某磁铁精矿产品因其全铁含量相对较低、二氧化硅含量相对较高,必须经过磁选工艺再选才可作为球团原料使用。磁铁精矿再选需要对进口物料进行事先的可选性预测,而传统矿物加工学理论如物相分析、筛分分析、磁性质分析、扫描电镜分析等对物料可选性的评价耗时费力、时效性不够、指导性不强,为此以实验数据为基础、以生产数据为指导,总结出适合在磁铁精矿再选中快速评价入选原矿可选性的一种创新方法,实践证明作为与球团配套的单一磁选工艺,该方法简单可靠、快速高效,具有一定的工业指导价值。

关键词：磁铁精矿再选可选性研究快速预测创新方法

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经尿道前列腺等离子电切除术围手术期护理

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科学之友 2012年第4期 160-161页

作者：邓声桂镇雄县人民医院

文章探讨经尿道前列腺等离子电切除术术前术后的护理及健康教育,帮助病人安全度过围手术期,提高病人生活质量。

关键词：前列腺等离子电切除术围手术期护理

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