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Three-dimensional stability calculation method for high and large composite slopes formed by mining stope and inner dump in adjacent open pits

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International Journal of Mining Science and Technology 2024年第4期34卷 507-520页

作者： Zuchao liang Dong Wang guanghe li Guangyu Sun Mingyu Yu Dong Xia Chunjian Ding College of Mining Engineering Liaoning Technical UniversityFuxin 123000China Inner Mongolia Pingxi Baiyinhua Coal Industry Co. Ltd.Xilingol League 026000China Guoneng Baorixile Energy Co. Ltd.Hulunbuir 021008China

The 2D limit equilibrium method is widely used for slope stability ***,with the advancement of dump engineering,composite slopes often exhibit significant 3D mechanical ***,it is of significant importance to develop an effective 3D stability calculation method for composite slopes to enhance the design and stability control of open-pit slope *** the composite slope formed by the mining stope and inner dump in Baiyinhua No.1 and No.2 open-pit coal mine as a case study,this research investigates the failure mode of composite slopes and establishes spatial shape equations for the sliding *** integrating the shear resistance and sliding force of each row of microstrip columns onto the bottom surface of the strip corresponding to the main sliding surface,a novel 2D equivalent physical and mechanical parameters analysis method for the strips on the main sliding surface of 3D sliding masses is ***,a comprehensive 3D stability calculation method for composite slopes is developed,and the quantitative relationship between the coordinated development distance and its 3D stability coefficients is *** analysis reveals that the failure mode of the composite slope is characterized by cutting-bedding sliding,with the arc serving as the side interface and the weak layer as the bottom interface,while the destabilization mechanism primarily involves shear *** spatial form equation of the sliding mass comprises an ellipsoid and weak plane *** analysis revealed that when the coordinated development distance is 1500 m,the error rate between the 3D stability calculation result and the 2D stability calculation result of the composite slope is less than 8%,thereby verifying the proposed analytical method of equivalent physical and mechanical parameters and the 3D stability calculation method for composite ***,the3D stability coefficient of the composite slope exhibits an exponential co

关键词： Composite slope Destabilization mechanism 3D mechanical effect Three-dimensional stability Coordinated development distance

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Evolution of soil DOM during thermal remediation below 100℃:concentration,spectral characteristics and complexation ability

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 31-41页

作者： Wan Huang Ziren Wan Di Zheng lifeng Cao guanghe li Fang Zhang State Key Joint Laboratory of Environment Simulation and Pollution Control State Environment Protection Key Laboratory of Microorganism Application and Risk ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China National Engineering Laboratory for Site Remediation Technologies Beijing 100015China

The impact of thermal remediation on soil function has drawn increasing *** far,as the most active fraction of soil organic matter,the evolution of dissolved organic matter(DOM)during the thermal remediation lacks in-depth investigation,especially for the temperatures value below 100℃.In this study,a series of soil thermal treatment experiments was conducted at 30,60,and 90℃ during a 90-d period,where soil DOM concentration increased with heating temperature and *** molecular weight,functional groups content and aromaticity of DOM all decreased during the thermal *** excitation-emission matrices(EEM)results suggested that humic acid-like substances transformed into fulvic acid-like substances(FIII/FV increased from 0.27 to 0.44)during the heating process,and five DOM components were further identified by *** change of DOM structures and components indicated the decline of DOM stability and hydrophilicity,and can potentially change the bioavailability and *** temperature also resulted in the decline of DOM complexation ability,which may be caused by the loss of binding sites due to the decrease of polar function groups,aromatic structures and hydrophilic *** study provides valuable information about the evolution of DOM during thermal remediation,which would potentially change the fate of metal ions and the effectiveness of the post-treatment technologies in the treated region.

关键词： Thermal remediation below 100℃ Heating temperature Soil DOM concentration DOM spectral characteristics Excitation-emission matrices(EEM) Complexation ability

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鼻内镜手术治疗鼻窦炎鼻息肉的临床疗效分析

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世界复合医学 2024年第3期10卷 151-155页

作者：李光合汶上县人民医院耳鼻咽喉头颈外科山东济宁272500

目的探讨鼻内镜手术治疗鼻窦炎鼻息肉的临床疗效。方法方便选取2022年1月—2023年6月汶上县人民医院耳鼻喉科治疗的86例鼻窦炎鼻息肉患者为研究对象,按随机数表法分为两组,每组43例。对照组使用传统鼻内镜手术,观察组使用改良鼻内镜手术... 详细信息

目的探讨鼻内镜手术治疗鼻窦炎鼻息肉的临床疗效。方法方便选取2022年1月—2023年6月汶上县人民医院耳鼻喉科治疗的86例鼻窦炎鼻息肉患者为研究对象,按随机数表法分为两组,每组43例。对照组使用传统鼻内镜手术,观察组使用改良鼻内镜手术,对比两组的临床疗效、康复指标及并发症、症状积分及嗅觉功能评分、鼻腔通气功能及相关指标。结果观察组治疗总有效率(95.35%)明显高于对照组(74.42%),差异有统计学意义(χ^(2)=7.340,P<0.05)。观察组术创上皮化时间以及症状消失时间均短于对照组,水肿、积脓、粘连、囊泡等并发症发生率低于对照组;观察组治疗后鼻塞、水肿、流涕、头痛等症状评分低于对照组,嗅觉功能评分高于对照组;观察组鼻腔气道阻力、鼻腔鼻窦结局测试20条、嗓音障碍指数-10均低于对照组,鼻腔容积大于对照组,差异有统计学意义(P均<0.05)。结论改良鼻内镜手术治疗鼻窦炎鼻息肉的临床疗效显著,能有效缓解症状,加快鼻黏膜康复速度,改善鼻腔功能及生活质量。

关键词：鼻窦炎鼻息肉鼻内镜手术临床疗效症状变化

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齐大山铁矿东帮边坡空间形态优化

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辽宁工程技术大学学报（自然科学版） 2024年第2期43卷 129-134页

作者：梁冰于金江李广贺辽宁工程技术大学矿业学院辽宁阜新123000

针对齐大山铁矿东帮边坡空间形态优化问题,在分析边坡工程地质条件的基础上,将极限平衡法与数值模拟法相结合,评价原设计到界边坡稳定性,优化设计到界边坡的形态参数,探讨追踪距离对边坡三维稳定性的影响规律。研究结果表明:采用逐水平... 详细信息

针对齐大山铁矿东帮边坡空间形态优化问题,在分析边坡工程地质条件的基础上,将极限平衡法与数值模拟法相结合,评价原设计到界边坡稳定性,优化设计到界边坡的形态参数,探讨追踪距离对边坡三维稳定性的影响规律。研究结果表明:采用逐水平优化方法设计的到界边坡角为46°,每阶段的边坡二维稳定性系数均满足安全储备系数要求;边坡的三维稳定性系数与追踪距离呈负相关指数函数关系,当追踪距离为50 m时,齐大山铁矿东帮到界边坡角可设计为48°,整体边坡角提高了2°,经济效益显著。

关键词：露天铁矿三维效应空间形态边坡稳定性追踪距离

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An emerging market for groundwater remediation in China： Policies, statistics, and future outlook

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Frontiers of Environmental Science & Engineering 2018年第1期12卷 1-3页

作者： Deyi Hou guanghe li Paul Nathanai School of Environment Tsinghua University Beijing 100084 China School of Geography University of Nottingham Nottingham NG7 2RD UK

There is a rapidly emerging and potentially huge market for the remediation of contaminated ground- water in China. The Chinese government published a Water Action Plan in April 2015, a Soil Action Plan in May 2016, and a draft Soil Pollution Prevention and Control Law in June 2017. All of these new policies and regulations put pressures on local governments and contaminated site owners, obliging them to conduct site investigation and to cleanup contaminated groundwater. The Chinese population in northern regions heavily depend on groundwater, with nearly 70% of water supply coming from aquifer sources in the Beijing-Tianjin-Hebei region. However, poor groundwater quality due to natural geochemical background and anthropogeic pollution is a serious concern, with poor or very poor quality water observed in nearly 80% of groundwater monitoring wells in 17 northern provinces. Shallow groundwater in many areas has been contaminated by toxic pollutants such as heavy metals and chlorinated organic compounds. There is an urgent need to better understand the situation and to conduct groundwater remediation at contaminated sites. The Chinese government is investing heavily in the research and development for groundwater remediation, which is expected to greatly add to the quality and quantity of groundwater remediation projects in the near future.

关键词： Groundwater pollution Contaminated land,Groundwater remediation Emerging market

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China released the Action Plan on Prevention and Control of Soil Pollution

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Frontiers of Environmental Science & Engineering 2016年第4期10卷 1-2页

作者： Fang Zhang guanghe li School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing10084 China

China released the Action Plan on Prevention and Control of Soil Pollution （i.e. ＂Soil Ten Chapters＂） on May 31st 2016. The plan aims to arrest the worsening situation by 2020, improve the soil quality with a comprehensively controlled risk by 2030, and form a virtuous ecosystem cycle by 2050. According to the plan,

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The effect of texture and irrigation on the soil moisture vertical-temporal variability in an urban artificial landscape： a case study of Olympic Forest Park in Beijing

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Frontiers of Environmental Science & Engineering 2015年第2期9卷 269-278页

作者： Xiaofeng ZHANG Xu ZHANG guanghe li School of Environment Tsinghua University Beijing 100084 China

Soil moisture variability in natural landscapes has been widely studied; however, less attention has been paid to its variability in the urban landscapes with respect to the possible influence of texture stratification and irrigation management. Therefore, a case study was carried out in the Beijing Olympic Forest Park to continuously monitor the soil in three typical profiles from 26 April to 11 November 2010. The texture stratification significantly affected the vertical distribution of moisture in the non- irrigated profile where moisture was mostly below field capacity. In the profile where irrigation was sufficient to maintain moisture above field capacity, gravity flow led to increased moisture with depth and thus eliminated the influence of texture. In the non-irrigated sites, the upper layer （above 80 cm） exhibited long-term moisture persis- tence with the time scale approximating the average rainfall interval. However, a coarse-textured layer wea- kened the influence of rainfall, and a fine-textured layer weakened the influence of evapotranspiration, both of which resulted in random noise-like moisture series in the deeper layers. At the irrigated site, frequent irrigation neutralized the influence of evapotranspiration in the upper layer （above 60 em） and overshadowed the influence of rainfall in the deeper layer. As a result, the moisture level in the upper layer also behaved as a random noise-like series; whereas due to deep transpiration, the moisture of the deep layer had a persistence time-scale longer than a month, consistent with characteristic time-scales found for deep transpiration.

关键词： moisture vertical distribution moisture tem-poral variation texture stratification irrigation meteorolo-gical forcing urban landscape

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Impact of solids on biphasic biodegradation of phenanthrene in the presence of hydroxypropyl-β-cyclodextrin(HPCD)

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Frontiers of Environmental Science & Engineering 2010年第3期4卷 329-333页

作者： Zhenyi ZHANG Chihiro INOUE guanghe li Department of Environmental Sciences&Engineering Tsinghua UniversityBeijing 100084China Graduate School of Environmental Studies Tohoku UniversitySendai 980-8579Japan

The consequence of polycyclic aromatic hydrocarbons(PAHs)in the environment is of great *** hydrophobic properties of PAHs significantly impact phase distribution causing limited *** biodegradation has been extensively carried out by surfactants and the redeployment effect was ***,the quantitative relationship concerning the impact of solids was rarely reported.A batch of biphasic tests were carried out by introducing Mycobacterium vanbaalenii PYR-1 and hydroxypropyl-β-cyclodextrin(HPCD)into a mixture of phenanthrene solution and various glass beads(GB37-63,GB105-125,and GB350-500).The comparative results demonstrated that HPCD had little effect on microbial growth and was not degradable by bacterium.A model was proposed to describe the biodegradation *** regression results indicated that the partition coefficient kd(1.234,0.726 and 0.448 L·g–1)and the degradation rate k(0 mmol·L^(–1):0.055,0.094,and 0.112;20 mmol·L^(–1):0.126,0.141,and 0.156;40 mmol·L^(–1):0.141,0.156 and 0.184 d^(–1))were positively and negatively correlated with the calculated total surface area(TSA)of solids,*** enhanced in the presence of HPCD,and the enhancing factor f was calculated(20 mmol·L^(–1):15.16,40.01,and 145.5;40 mmol·L^(–1):13.29,37.97,and 138.4),indicating that the impact of solids was significant for the enhancement of biodegradation.

关键词： biphasic biodegradation hydroxypropyl-β-cyclodextrin(HPCD) polycyclic aromatic hydrocarbons(PAHs)

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Microbial community and functional genes in the rhizosphere of alfalfa in crude oil-contaminated soil

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Frontiers of Environmental Science & Engineering 2012年第6期6卷 797-805页

作者： YiZHONG Jian WANG Yizhi SONG Yuting liANG guanghe li School of Environment Tsinghua UniversityBeijing 100084China State Key Joint Laboratory of Environmental Simulation and Pollution Control Tsinghua UniversityBeijing 100084China

A rhizobox system constructed with crude oil- contaminated soil was vegetated with alfalfa （Medicago sativa L.） to evaluate the rhizosphere effects on the soil microbial population and functional structure, and to explore the potential mechanisms by which plants enhance the removal of crude oil in soil. During the 80-day experiment, 31.6% of oil was removed from the adjacent rhizosphere （AR）; this value was 27% and 53% higher than the percentage of oil removed from the far rhizosphere （FR） and from the non-rhizosphere （NR）, respectively. The populations of heterotrophic bacteria and hydrocarbon- degrading bacteria were higher in the AR and FR than in the NR. However, the removal rate of crude oil was positively correlated with the proportion of hydrocarbon- degrading bacteria in the rhizosphere. In total, 796, 731, and 379 functional genes were detected by microarray in the AR, FR, and NR, respectively. Higher proportions of functional genes related to carbon degradation and organic remediation, were found in rhizosphere soil compared with NR soil, suggesting that the rhizosphere selectively increased the abundance of these specific functional genes. The increase in water-holding capacity and decrease in pH as well as salinity of the soil all followed the order of AR 〉 FR 〉 NR. Canonical component analysis showed that salinity was the most important environmental factor influencing the microbial functional structure in the rhizosphere and that salinity was negatively correlated with the abundance of carbon and organic degradation genes.

关键词： crude oil-contaminated soil phytoremedia-tion rhizosphere effects rhizobox functional genes

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Stability of inner dump slope under coal pillar support:case study in an open‑pit coal mine

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International Journal of Coal Science & Technology 2022年第2期9卷 193-210页

作者： guanghe li Xiaoxu Yang Dong Wang Yanting Wang Xiangyu Yu College of Mining Liaoning Technical UniversityFuxin 123000LiaoningChina

The stability of an inner dump slope was investigated under the efect of coal pillar support considering the development position of *** on the instability mechanism and load distribution characteristics of the supporting coal pillar,the three-dimensional mechanical efects of the supporting coal pillar are *** the two-dimensional equivalent principle and the residual thrust method,the stability of the inner dump slope was analyzed under the efect of pillar support at diferent dump development *** quantitative efects of various factors on the inner dump slope stability were revealed,and the coal pillar shape parameters were optimized through numerical *** results indicate that the slope stability coefcient is linearly related to the top width and height of the coal pillar,slope angle,and base inclination angle,and has an exponential relation with the coal pillar strike length and slope height *** are quadratic and absolute value relations with the coal pillar outer and the inner bottom angle,*** top width of the coal pillar in the inner dump of Shengli East No.2 open-pit coal mine should be at a level of+824 m,and the optimal top width and height are 15 and 36.7 m,*** instability mechanism of the supporting and retaining coal pillar obtained by numerical simulations and the stability of the inner dump are in good agreement with the theoretical *** results provide a theoretical basis for the design,treatment,and safe implementation of similar open-pit mine slope engineering.

关键词： Inner dump Supporting coal pillar Slope stability Numerical simulation Morphological parameters

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