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Effect of Dry-Wet Cycle on Stability of Granite Residual Soil Slope 2

Effect of Dry-Wet Cycle on Stability of Granite Residual Soi...

2020 2nd International Conference on Advances in Civil engineering, Energy Resources and Environment engineering, ACCESE 2020

作者： Wang, De-Yong Zeng, Qing-Jun Wang, Jing Zhou, Mi CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangzhou510230 China Key Laboratory of Environmental Protection and Safety of Communication Foundation Engineering CCCC Guangzhou510230 China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai519082 China State Key Laboratory of Subtropical Building Science South China University of Technology Guangzhou Guangdong510640 China

The dry-wet cycle has a significant effect on the shear strength of the granite residual soil, which will affect the stability of the slope. A numerical model of the road cutting slope considering the strength change of the granite residual soil under conditions of dry-wet cycle was established. The numerical model was compared with the previous research results to obtain a good agreement, indicating the validity of the model established. Then several influence factors such as the number of cycles, initial cohesion, friction angle, initial slope angle, excavation slope angle and other factors are considered, and the parameter analysis of the stability development of the road cutting slope with the strength changes of the granite residual soil under dry and wet cycling conditions is considered. The research results show that the dry-wet cycle has a great impact on the stability of the road cutting slope of granite residual soil, which reduces the slope stability by about 10-30%. The conclusions of this paper provide a certain theoretical guidance for the design and application of the roadside slope engineering of granite residual soil. © Published under licence by IOP Publishing Ltd.

关键词： Numerical models

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Recent greening of grasslands in northern China driven by increasing precipitation

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Journal of Plant Ecology 2021年第5期14卷 843-853页

作者： Kai Di Zhongmin Hu Mei Wang Ruochen Cao Minqi Liang Genan Wu Ruru Chen Guangcun Hao Yaolong Zhao School of Geography South China Normal UniversityShipai CampusGuangzhou 510631China Synthesis Research Center of Chinese Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100101China China Communications Construction Co.Ltd. Fourth Harbor Engineering Institute Co.Ltd.Guangzhou 510230China China Communications Construction Co.Ltd. Key Laboratory of Environmental Protection&Safety of Communication Foundation EngineeringGuangzhou 510230China

Aims Recent warmer and wetter climate in northern China remains a hot topic in recent years,yet its effect on vegetation growth has not been fully *** study investigated the temporal change of vegetation cover and its correlations with climatic variables from 1982 to 2018 for grasslands in northern *** aim is to clarify whether the warmer and wetter climate in recent years drives the greening of the vegetation in this *** We investigated the temporal dynamic of vegetation normalized difference vegetation index(NDVI)and its driving forces based on long time-series *** regression was used to examine whether there was a turning point of the trend of NDVI and climatic *** correlation analyses were conducted to quantify the relationship between NDVI and climatic *** multivariable regression was used to quantify the contributions of climate variables to the temporal variations in *** Findings We found a turning point of NDVI trend in 2008,with GIMMS NDVI indicating a slight increase of 0.00022 yr?1 during 1982–2008 to an increase of 0.002 yr?1 for GIMMS NDVI during 2008–2015 and 0.0018 yr?1 for MODIS NDVI during 2008–*** was the predominant driver,and air temperature and vapor pressure deficit exerted a minor impact on the temporal dynamics of ***,our results suggest a turning point of NDVI trend,and that recent warmer and wetter climate has caused vegetation greening,which provides insights for better predicting the vegetation cover in this region under changing climate.

关键词： plant growth temporal dynamics turning point trend change climate change

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Three-dimensional geonet ecological slope protection technology and its engineering application

Three-dimensional geonet ecological slope protection technol...

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作者： WANG De-yong Zun Qing-jun Wang Jing Huang Wei-yuan CCCC Fourth Harbor Engineering Institute Co. Ltd. Key Laboratory of Environmental Protection & Safety of Communication Foundation Engineering CCCC Hohai university

A protective structure system for slope with combination of vegetation and 3 D geonet network was established. First the mechanism and ecological effects of slope protection with vegetation technology in slope engineering were discussed. Then specific implementation steps were proposed. Taking a slope ecological restoration project as an example, herbaceous plants suitable for slope protection were compared and tested, long term monitoring shows that the slope plants grow well, the protection effect of the new branches and roots were obvious, the stability of the slope was enhanced under comprehensive protection measures.

关键词： net Three-dimensional geonet ecological slope protection technology and its engineering application

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Nano-enabled strategies to promote safe crop production in heavy metal(loid)-contaminated soil

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Science of the Total Environment 2024年 947卷 174505页

作者： Chen, Li Fang, Linchuan Tan, Wenfeng Bing, Haijian Zeng, Yi Chen, Xunfeng Li, Zimin Hu, Weifang Yang, Xing Shaheen, Sabry M. White, Jason C. Xing, Baoshan College of Natural Resources and Environment Northwest A&F University Yangling712000 China Key Laboratory of Green Utilization of Critical Non-metallic Mineral Resources Ministry of Education Wuhan University of Technology Wuhan430070 China State Environmental Protection Key Laboratory of Soil Health and Green Remediation College of Resources and Environment Huazhong Agricultural University Wuhan430070 China Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu China Biofuels Institute School of Environment and Safety Engineering Jiangsu University Zhenjiang212013 China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an71000 China Institute of Agricultural Resources and Environment Guangdong Academy of Agricultural Sciences Guangzhou510000 China College of Ecology and Environment Hainan University Haikou570100 China School of Architecture and Civil Engineering Institute of Foundation Engineering Water- and Waste-Management Laboratory of Soil- and Groundwater-Management University of Wuppertal Wuppertal Germany Faculty of Environmental Sciences Department of Agriculture King Abdulaziz University Jeddah Saudi Arabia Faculty of Agriculture Department of Soil and Water Sciences University of Kafrelsheikh Kafr El-Sheikh Egypt The Connecticut Agricultural Experiment Station New HavenCT United States Stockbridge School of Agriculture University of Massachusetts Amherst United States

Nanobiotechnology is a potentially safe and sustainable strategy for both agricultural production and soil remediation, yet the potential of nanomaterials (NMs) application to remediate heavy metal(loid)-contaminated soils is still unclear. A meta-analysis with approximately 6000 observations was conducted to quantify the effects of NMs on safe crop production in soils contaminated with heavy metal(loid) (HM), and a machine learning approach was used to identify the major contributing features. Applying NMs can elevate the crop shoot (18.2 %, 15.4–21.2 %) and grain biomass (30.7 %, 26.9–34.9 %), and decrease the shoot and grain HM concentration by 31.8 % (28.9–34.5 %) and 46.8 % (43.7–49.8 %), respectively. Iron-NMs showed a greater potential to inhibit crop HM uptake compared to other types of NMs. Our result further demonstrates that NMs application substantially reduces the potential health risk of HM in crop grains by human health risk assessment. The NMs-induced reduction in HM accumulation was associated with decreasing HM bioavailability, as well as increased soil pH and organic matter. A random forest model demonstrates that soil pH and total HM concentration are the two significant features affecting shoot HM accumulation. This analysis of the literature highlights the significant potential of NMs application in promoting safe agricultural production in HM-contaminated agricultural lands. © 2024 Elsevier B.V.

关键词： Heavy metals

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Field Test and Inspection of Large Area Hydraulic Sand Ground Improved by Vibro-compaction 5

Field Test and Inspection of Large Area Hydraulic Sand Groun...

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2019 5th International Conference on Hydraulic and Civil engineering, ICHCE 2019

作者： De-Yong, Wang Sheng, Chen Xiao-Cong, Liang CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangzhou510230 China Key Laboratory of Environmental Protection and Safety of Communication Foundation Engineering CCCC Guangzhou510230 China

Liquefied Natural Gas (LNG) storage tanks have high requirements for the bearing capacity, settlement, resistance to liquefaction, and compactness of foundation. An LNG site about 500,000 m2 in the Middle East was hydraulic filled by trailing suction hopper dredger and cutter suction dredger, and it was improved by vibro-compaction. A filed test was carried out to optimize the key process parameters and inspection scheme. Field inspection methods included standard penetration test (SPT), cone penetration test (CPT), and zone load test (ZLT). The test results showed that the comprehensive inspection could be effectively inspected by CPT and SPT, the deformation modulus were back-calculated by ZLT and therefore the long-term settlement could be accurately predicted. The research can provide reference for the design, inspection and optimization of large area ground improved by vibro-compaction. © Published under licence by IOP Publishing Ltd.

关键词： Testing

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Experimental study on anti-eroding effect of slope protected by degradable geocell

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IOP Conference Series: Earth and environmental Science 2021年第1期634卷

作者： Wang De-yong Hu Jun-long Wang Jing Zun Qing-jun CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangzhou 510230 China Key Laboratory of Environmental Protection & Safety of Communication Foundation Engineering CCCC Guangzhou 510230 China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519082 China

In order to study the anti-erosion mechanism of the new degradable geocell which is designed for slope protection and the influence of rainfall intensity and materials on its anti-erosion performance, based on the laboratory simulated rainfall tests, the erosion damage mode and water erosion of slope under the protection of linen fiber and bamboo fiber braided geocell under different rainfall intensities are studied by taking photos of the slope surface and collecting and weighing the erosion material. The results show that the new type of degradable geocell for slope protection can effectively prevent the development of slope gullies, and the slope damage is mainly splash erosion and sheet erosion. The use of linen fiber and bamboo fiber braided geocell can effectively reduce the maximum water erosion by more than 10% and the accumulated water erosion by more than 20%. With the increase of rainfall intensity, the maximum water erosion and accumulated water erosion are increased, but the increase range is 20% ∼ 33% and 35% ∼ 57% lower than that of bare slope, respectively. The results show that the anti-erosion ability of bamboo fiber braided geocell is slightly better than that of linen fiber braided geocell, and the ratio of maximum water erosion and accumulated water erosion reduced is slightly higher than that of linen fiber braided geocell.

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Identification of MMG model for ship manoeuvring motion in 4-DOF using least square support vector machines 29th

Identification of MMG model for ship manoeuvring motion in 4...

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29th International Ocean and Polar engineering Conference, ISOPE 2019

作者： Wang, Xue-Gang Zou, Zao-Jian Jiang, Yan CCCC Fourth Harbor Engineering Institute Co. Ltd. GuangzhouGuangdong China CCCC Key Lab of Environmental Protection & Safety in Foundation Engineering of Transportation GuangzhouGuangdong China School of Naval Architecture Ocean and Civil Engineering State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781880653852

By taking the influence of the roll motion and propeller revolution into account, a method based on support vector machines is proposed for identifying the hydrodynamic derivatives and the coefficients of hull-propeller-rudder interaction in the MMG model for ship manoeuvring motion in 4 degrees of freedom. 10°/10°, 20°/20° zigzag tests and 35° turning circle manoeuvre are simulated for a container ship by using the hydrodynamic derivatives and interaction coefficients obtained from the captive model tests. Part of the simulation data of 20°/20° zigzag test is used to identify the hydrodynamic derivatives and interaction coefficients, and the identification results are compared with those of captive model tests to verify the identification method. Then 10°/10°, 20°/20° zigzag tests and 35° turning circle manoeuvre are predicted with the identified hydrodynamic derivatives and interaction coefficients. The predicted results are compared with those of simulation tests to demonstrate the good predictive ability and generalization performance of the proposed identification method. © 2019 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Support vector machines

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Road performance and construction of weathered siltstone for expressway subgrade

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IOP Conference Series: Earth and environmental Science 2021年第1期638卷

作者： Wang De-yong Hu Jun-long Wang Jing Gao Shang-hui CCCC Fourth Harbor Engineering Institute Co. Ltd. Guangzhou 510230 China Key Laboratory of Environmental Protection & Safety of Communication Foundation Engineering CCCC Guangzhou 510230 China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519082 China The Sixth Engineering Company of CCCC fourth Harbor Engineering Co. Ltd. Zhuhai51900

Whether weathered siltstone can be used for expressway subgrade filling, there is currently no clear regulation, and there is a lack of relevant evaluation standards. In order to solve the problem of expressway slag disposal and the source of subgrade fillers, relying on an expressway in northern Guangdong, the characteristics of compaction and disintegration of weathered siltstone material are tested and studied. The research shows that: the weathered sandstone material has strong softening and disintegration characteristics, but good compaction performance, and can be used for expressway subgrade filling. The filling process parameters of weathered siltstone subgrade are determined through field test.

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Review of soft rock weathered material for subgrade filling

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IOP Conference Series: Earth and environmental Science 2021年第1期638卷

With the continuous construction and development of Chinese infrastructure, more and higher requirements are imposed on the construction of expressway engineering. The construction of mountainous expressway has been gradually transformed from winding mountain to bridging and digging tunnels. Various forms of subgrade such as high filling and deep cutting, half filling and half cutting are unavoidable. The huge demand for roadbed filling and the inconvenience of transportation conditions have caused extreme costs for external materials. On the other hand, tunnel excavation brings a large amount of soft rock abandoned slag. If soft rock abandoned slag can be used for subgrade filling, it will not only help avoid resource waste, but also help reduce environmental damage. This paper introduces progress of researches at home and abroad on engineering properties, particle composition and distribution characteristics, CBR, compaction characteristics, etc. of soft rock, as well as the evaluation criteria and applicability of soft rock as subgrade filler in detail.

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Analysis and Improvement of Oblique Shear Phenomenon of Direct Shear Apparatus

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IOP Conference Series: Earth and environmental Science 2021年第1期768卷

作者： Teng Chao Liu Zhijun Wang Xuegang He Liping CCCC Fourth Harbor Engineering Institute Co. Lttd. Guangzhou 510230. China CCCC Key lab of environmental Protection &Safety in Foundation Engineering of Transportation Guangzhou 510230. China Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)

Direct shear test is an important method to test the shear strength of soil. But the phenomenon of 'oblique shear' often appears in the process of test, the soil sample subjected to eccentric pressure and uneven stress distribution, which affect the stability and accuracy of the test. This paper, starts from the construction of the direct shear apparatus, found that the relative displacement between the upper shear box and the axial pressure rod, is one important cause of 'oblique shear'. Set the steel ring between the lower shear box and the push rod, dose not affect the shear force measurement and can completely fix the upper shear box. There is no relative displacement between the upper shear box and the rod used to apply axial pressure after improvement, and no the phenomenon of 'oblique shear'. The experimental results are more stable and the coefficient of variation is smaller. The improvement scheme of the direct shear apparatus is simple, the improvement effect is obvious, and the stability and accuracy of the direct shear test are improved.

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