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Three-dimensional numerical analysis of plant-soil hydraulic interactions on pore water pressure of vegetated slope under different rainfall patterns

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3696-3706页

作者： haowen guo Charles Wang Wai Ng Qi Zhang Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong KongChina

Understanding the pore water pressure distribution in unsaturated soil is crucial in predicting shallow landslides triggered by rainfall,mainly when dealing with different temporal patterns of rainfall ***,the hydrological response of vegetated slopes,especially three-dimensional(3D)slopes covered with shrubs,under different rainfall patterns remains unclear and requires further *** address this issue,this study adopts a novel 3D numerical model for simulating hydraulic interactions between the root system of the shrub and the surrounding *** series of numerical parametric studies are conducted to investigate the influences of slope inclination,rainfall pattern and rainfall *** rainfall patterns(advanced,bimodal,delayed,and uniform)and two rainfall durations(4-h intense and 168-h mild rainfall)are considered to study the hydrological response of the *** computed results show that 17%higher transpiration-induced suction is found for a steeper slope,which remains even after a short,intense rainfall with a 100-year return *** extreme rainfalls with advanced(PA),bimodal(PB)and uniform(PU)rainfall patterns need to be considered for the short rainfall duration(4 h),while the delayed(PD)and uniform(PU)rainfall patterns are highly recommended for long rainfall durations(168 h).The presence of plants can improve slope stability markedly under extreme rainfall with a short duration(4 h).For the long duration(168 h),the benefit of the plant in preserving pore-water pressure(PWP)and slope stability may not be sufficient.

关键词： Root-soil interactions Rainfall patterns Slope stability Three-dimensional(3D)

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Modelling the water diversion of a sustainable cover system under humid climates

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2429-2440页

作者： haowen guo Charles Wang Wai Ng Qi Zhang Chuanxiang Qu Liwen Hu Shenzhen Research Institute of Hong Kong University of Science and Technology Shenzhen518057China Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong SAR999077China CCCC Fourth Harbor Engineering Institute Co. LtdGuangzhou510230China

Extreme rainfall significantly threatens the safety of the landfill cover system,especially under humid *** study aims to provide design recommendations for a sustainable landfill cover system consisting of a low-permeability soil layer underlying a two-layer capillary barrier for humid ***,the numerical back-analysis was conducted for verification against a series of flume model ***,a parametric study was performed to investigate the effects of inclination angle,particle size and layer thickness on the lateral diversion length(DL)of the three-layer cover system under the 100-year return period rainfall of humid *** results show that the water lateral DL of the cover system can be greatly enhanced by increasing the inclination angle from 3°to 18°.Moreover,the bottom layer of the cover system with a coarser d10 was more susceptible to the impact of the heavy rainfall,while this can be alleviated by increasing the thickness of the bottom layer.A dimensionless number,defined as the ratio of thickness and d_(10) of the bottom layer,is proposed for designing lateral diversion of the three-layer cover system under humid *** preserve the maximum DL,it is suggested that the proposed dimensionless number should be larger than 95 and 110 for the design of rainfall events with 50-year and 100-year return periods for humid climates,respectively.

关键词： Unsaturated soil Recycling Construction waste Three-layer landfill cover Water infiltration

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Three-year field study on grass growth and soil hydrological properties in biochar-amended soil

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2764-2774页

作者： haowen guo Charles Wang Wai Ng Junjun Ni Qi Zhang Yuchen Wang Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong KongChina School of Transportation Southeast UniversityNanjingChina

Field monitoring was conducted to investigate and quantify the long-term effects of peanut shell biochar on soil-grass interaction over three *** 10 m5 m grassed plots were constructed in completely decomposed granitic *** of them were amended,respectively,with 5%and 10%biochar contents(m^(3)/m^(3))for grass growth,while the third was without biochar *** the threeyear monitoring,plant characteristics,saturated water permeability(k_(s))of grassed soil and soil suction were *** monitored results show that the grass leaf area index(LAI)and root length density(RLD)with biochar amendment were improved by 38%and 200%,*** the grassed plot without biochar,a threshold RLD existed with a value of 1.7 cm/cm^(3),beyond which k_(s) raised *** threshold RLD increased by 52%when biochar content increased from 0%to 10%.This implies that biochar may restrict the increase in k_(s) of grassed soil due to the rise in the threshold *** presence of biochar and grass can retain over 100%higher suction after heavy rainfalls,while 54%lower peak suction under evapotranspiration(ET)compared with the non-amended *** can alleviate the negative effects on hydraulic properties caused by plant growth and reduce ET-induced excessive water loss.A 5%peanut shell biochar content is recommended for the long-term management of vegetated earthen infrastructures.

关键词： Soil-grass interaction Biochar Long-term Water infiltration Soil drying

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水、气边界可控/测的大尺寸模型槽试验系统

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岩土工程学报 2024年第S1期46卷 37-42页

作者：路紫辰陈锐王浩陈子彬郭浩文黄俊文哈尔滨工业大学(深圳)土木与环境工程学院广东深圳518055 广东省土木工程智能韧性结构重点实验室广东深圳518055 香港科技大学土木与环境工程学系中国香港999077

准确评价垃圾填埋场土质覆盖层的水气调控性能对于污染治理尤为重要。现有模型试验设备的密封效果大多不理想,无法准确地控制气压,不能较好地模拟垃圾填埋场实际工况的水、气边界条件。为解决此类问题,设计了水、气边界可控/测的大尺寸... 详细信息

准确评价垃圾填埋场土质覆盖层的水气调控性能对于污染治理尤为重要。现有模型试验设备的密封效果大多不理想,无法准确地控制气压,不能较好地模拟垃圾填埋场实际工况的水、气边界条件。为解决此类问题,设计了水、气边界可控/测的大尺寸模型槽试验系统。该系统可监测覆盖层不同深度孔隙水压力、孔隙气压力和体积含水量的变化,并收集覆盖层的表面径流量、侧向导排量及底部渗漏量。模型槽侧壁通过内外套板及卡套挤压O型圈进行密封,经检验,该密封装置可确保模型槽具备良好的闭气性和闭水性,有助于进一步研究土质覆盖层防渗闭气规律及机理。通过应用该试验系统,评估了强降雨条件下植草(狗牙根草)倾斜双层毛细阻滞覆盖层水气耦合运移的短期响应。初步试验结果表明,植草倾斜覆盖层在强降雨结束时渗漏量占降雨量的2.4%,降雨时坡顶处砂土层的吸力大于击穿吸力,毛细阻滞作用未失效,若忽略气压的影响会低估覆盖层的导排性能。

关键词：模型槽边界条件密封水气耦合土质覆盖层

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Gas permeability and emission in unsaturated vegetated landfill cover with biochar addition

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Biochar 2023年第1期5卷 815-829页

作者： Junjun Ni Jingsong Zhou Yuchen Wang haowen guo School of Transportation Southeast UniversityNanjingChina Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong SARChina

Plant-biochar interaction has been recognized to affect the hydraulic properties of landfill cover soils,while its influence on landfill gas emission is rarely *** study investigated the coupled effects of biochar and vegetation on gas permeability and emission in unsaturated landfill cover through an integrated theoretical modelling and laboratory ***,a gas permeability model was developed for vegetated coarse-grained soils with biochar ***,a well-instrumented laboratory column test and two tests from the literature,considering bare,grass,biochar and grass+biochar conditions,were used for model ***,a numerical parametric study was conducted to investigate the influence of root growth and drought conditions on the gas emission *** showed that the developed model can satisfactorily capture the gas permeability of unsaturated soils at various degrees of *** lowest water retention capacity,the highest gas permeability and gas emission rate after 24 months of growth were observed in the grassed ***,adding biochar in vegetated soils can maximize the water retention capacity and decrease the gas permeability,resulting in the lowest gas emission *** measured gas emission rates for the four cases meet the recommended value by the design *** parametric study showed that the increased root depth from 0.2 m to 0.4 m improved the gas emission rate by 170%in the grass case but decreased by 97%in the grass+biochar *** the severe drought condition with soil suction around 500 kPa,the gas emission rate in the grassed case exceeded the design value by 18%,while those in the biochar cases were far below the allowable ***,peanut shell biochar should be considered to amend the grassed landfill cover using coarse-grained soils as it can significantly improve engineering performance in reducing gas emissions under extreme drought conditions.

关键词： Plant-biochar interaction Gas permeability model Gas emission Numerical simulation

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“海上田园”背景下的渔排多微电网经济运行优化策略

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福建理工大学学报 2024年第4期22卷 379-386,400页

作者：郭昊文陈思妍罗浩黄靖福建理工大学电子电气与物理学院福建福州350118

针对“海上田园”渔排多微电网系统,提出了微电网群系统模型,并针对其在无大电网支持的特殊环境下维持电力所面临的供应稳定性和经济效益的挑战,提出了两个经济性目标函数,综合考虑了微电网间的功率调度及其经济效益。应用非支配排序遗... 详细信息

针对“海上田园”渔排多微电网系统,提出了微电网群系统模型,并针对其在无大电网支持的特殊环境下维持电力所面临的供应稳定性和经济效益的挑战,提出了两个经济性目标函数,综合考虑了微电网间的功率调度及其经济效益。应用非支配排序遗传算法Ⅱ(NSGA-Ⅱ)和基于分解的约束多目标进化算法(CMOEA/D)对目标函数求解。结果表明,CMOEA/D算法在追求经济最优解方面表现出较高的效率和准确度,在最优解的质量和迭代时间上也都比NSGA-Ⅱ算法表现更优,验证了所提模型和算法的有效性。

关键词：多微电网多目标优化 NSGA-Ⅱ CMOEAD 优化策略

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“双碳”背景下公路裸露边坡生态修复的几点思考

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交通节能与环保 2024年第4期20卷 123-127页

作者：郝珖存董志良郭浩文中交四航工程研究院有限公司广东广州510230 中交集团交通基础工程环保与安全重点实验室广东广州510230 香港科技大学土木与环境工程学系中国香港999077

为掌握“双碳”背景下公路边坡生态修复的相关研究,文中基于CNKI、Web of Science等数据库及工程实践经验,从边坡恢复生态系统固碳潜力及其影响因素、植被对边坡工程稳定性的影响、边坡恢复生态系统稳定性的研究这几个方面,对边坡生态... 详细信息

为掌握“双碳”背景下公路边坡生态修复的相关研究,文中基于CNKI、Web of Science等数据库及工程实践经验,从边坡恢复生态系统固碳潜力及其影响因素、植被对边坡工程稳定性的影响、边坡恢复生态系统稳定性的研究这几个方面,对边坡生态修复领域研究现状进行了分析讨论,指出目前还存在边坡植被固碳尚且没有统一结论、缺乏生态系统长期稳定性的评价方法及数据等问题,并对此提出相关建议。

关键词：道路工程公路边坡生态恢复固碳潜力工程稳定性生态系统稳定性

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Analysis of a landfill cover without geomembrane using varied particle sizes of recycled concrete

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1263-1273页

作者： Charles Wang Wai Ng Cheuk Lam Ng Junjun Ni haowen guo Qi Zhang Qiang Xue Rui Chen Department of Civil and Environmental Engineering Hong Kong University of Science and TechnologyHong KongChina School of Transportation Southeast UniversityNanjingChina State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Department of Civil and Environmental Engineering Shenzhen Graduate SchoolHarbin Institute of TechnologyShenzhenChina

Previous studies have demonstrated the effectiveness of a novel three-layer landfill cover system constructed with recycled concrete aggregates(RCAs)without geomembrane in both laboratory and ***,no systematic investigation has been carried out to optimize the combination of the particle sizes for fine-grained RCAs(FRC)and coarse-grained RCAs(CRC)that can be used for the three-layer landfill cover *** aim of this paper is to assist engineers in designing the three-layer landfill cover system under a rainfall of 100-year return period in humid climate conditions using an easily controlled soil parameter D10 of *** numerical study reveals that when D10 of FRC increases from 0.05 mm to 0.16 mm,its saturated permeability increases by 10 *** a result,a larger amount of rainwater infiltrates into the cover system,causing a higher lateral diversion in both the top FRC and middle CRC *** further changes in the lateral diversion are observed when the D10 value of FRC is larger than 0.16 *** the particle sizes of FRC and CRC layers are shown to have a minor influence on the percolation under the extreme rainfall *** implies that the selection of particle sizes for the FRC and CRC layers can be based on the availability of *** it is well known that the bottom layer of the cover system should be constructed with very fine-grained soils if possible,this study provides an upper limit to the particle size that can be used in the bottom layer(D10 not larger than 0.02 mm).With this limit,the three-layer system can still minimize the water percolation to meet the design criterion(30 mm/yr)even under a 100-year return period of rainfall in humid climates.

关键词： Capillary barrier Landfill cover Particle size Recycled concrete

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Ta_(2)NiSe_(5) nanosheets as a novel broadband saturable absorber for solid-state pulse laser generation

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Science China Materials 2021年第6期64卷 1468-1476页

作者： Bingzheng Yan haowen guo Guanbai He Jiajia Mao Feifei Wang Kejian Yang Baitao Zhang Jingliang He State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China School of Physics Southeast UniversityNanjing 210096China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Two-dimensional(2D)ternary chalcogenides have attracted great attentions because of their novel chemical and physical properties arising from the synergistic effect and stoichiometric variation with the additional third element compared with their binary ***,high-quality 2D tantalum nickel selenide(Ta_(2)NiSe_(5))nanosheets are successfully fabricated by a liquid-phase exfoliation(LPE)*** ultrafast excited carrier relaxation time and nonlinear optical absorption response are investigated and reveal that the prepared 2D Ta_(2)NiSe_(5)nanosheets have excellent broadband saturable absorption properties,which are further illustrated by three passively Q-switched(PQS)allsolid-state lasers operating at 1.0,2.0 and 2.8μm with the Ta_(2)NiSe_(5)nanosheet-based saturable absorber(SA).Furthermore,mode-locked laser operation with the pulse width as short as 356 fs is also realized at 1.0μ*** work not only demonstrates the excellent nonlinear optical proprieties and optical modulation performance of Ta_(2)NiSe_(5),but also paves the way for exploring the photonic and optoelectronic proprieties of ternary chalcogenide materials.

关键词： Ta_(2)NiSe_(5) saturable absorbers passively Q-switched lasers ultrafast lasers

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制冷剂R1336mzz(E)液相黏度理论与实验研究

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化工学报 2021年第6期72卷 3261-3269页

作者：许晨怡叶恭然郭豪文庄园郭智恺韩晓红陈光明浙江省制冷与低温重点实验室浙江大学制冷与低温研究所浙江杭州310027 含氟温室气体替代及控制处理国家重点实验室浙江省化工研究院有限公司浙江杭州310023

研究新型制冷剂的热物理性质是制冷剂替代工作的基础。在新型环保HFO类制冷剂中,R1336mzz(E)因其与R245fa相似的热力学性质,在高温热泵和有机朗肯循环中有希望成为R245fa的替代制冷剂。采用旋转式毛细管黏度计,测量了278~333 K温度范围... 详细信息

研究新型制冷剂的热物理性质是制冷剂替代工作的基础。在新型环保HFO类制冷剂中,R1336mzz(E)因其与R245fa相似的热力学性质,在高温热泵和有机朗肯循环中有希望成为R245fa的替代制冷剂。采用旋转式毛细管黏度计,测量了278~333 K温度范围内R1336mzz(E)的液相黏度,并根据四种形式的液体黏度方程对实验数据进行拟合,得到R1336mzz(E)黏度与温度的关联式。结果表明,采用修正后的非线性Andrade关联式所关联的精度最高,其关联结果与实验结果之间平均绝对偏差(AAD)和最大绝对偏差(MAD)分别为0.170%和0.311%。基于R1336mzz(E)于高温热泵的应用前景,通过拟合所得的四种黏度关联式对实验数据进行至临界温度(403.37 K)的外推,根据误差分析,采用修正后的非线性Andrade关联式外推得到的数据最可靠,可作为R1336mzz(E)临界温度附近的黏度数据。研究工作可以为R1336mzz(E)的替代应用研究提供基础数据。

关键词：黏度热力学性质制冷剂 R1336mzz(E) 流体动力学

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