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Hyperstatic reaction method for calculations of tunnels with horseshoe-shaped cross-section under the impact of earthquakes

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 179-188页

作者： Thanh Nguyen Chi Gospodarikov Alexandr saint petersburg mining university Saint PetersburgRussia Federation Hanoi university of mining and Geology HanoiVietnam

Tunnels are now an integral part of the infrastructure in major cities around the world. For many reasons, these tunnels have horseshoe-shaped cross-sections with round top and flat bottom. This paper presents some improvements to the use of the Hyperstatic Reaction Method-HRM for analysing tunnels with horseshoe-shaped cross-sections when these tunnels operate under the influence of earthquakes, particularly in cases when the tunnel lining is a continuous lining. The analysis used parameters of a tunnel from the Hanoi metro system, as well as parameters of the strongest earthquake that may occur in the central Hanoi area in the improved HRM and 2 D numerical methods using the ABAQUS software. On the basis of the results obtained, the paper gives conclusions about the HRM methodology when it is used to calculate tunnels that have horseshoe cross-sections operating under the influence of earthquakes.

关键词： hyperstatic reaction method earthquake horseshoe cross-section impact tunnel

倾斜煤层长壁开采承压底板力学结构及渗流稳定性分析

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Journal of Central South university 2023年第9期30卷 2948-2965页

作者：梁帅帅张东升范钢伟 KOVALSKY Evgeny 范张磊张磊韩学森 School of Mines China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Resources and Safe mining China University of Mining and TechnologyXuzhou 221116China Department of mining Engineering Saint Petersburg Mining UniversitySaint Petersburg 199106Russia

倾斜煤层开采底板破坏易造成水资源流失甚至突水灾害问题,倾斜煤层产量在中国总产量中占有一定比例,因此,开展关于地面结构对地下开采响应稳定性的研究有重要意义。首先,通过分析底板应力状态与变形破坏规律,建立了双向线性载荷作用下... 详细信息

倾斜煤层开采底板破坏易造成水资源流失甚至突水灾害问题,倾斜煤层产量在中国总产量中占有一定比例,因此,开展关于地面结构对地下开采响应稳定性的研究有重要意义。首先,通过分析底板应力状态与变形破坏规律,建立了双向线性载荷作用下四边固支倾斜层合板模型;然后,通过研究渗透系数与变形之间的关系得到渗流稳定性判别方法及条件,并通过工程案例确定了倾斜煤层保水开采的影响因素及其敏感性。倾斜煤层底板最大挠度工作面方向位于工作面中下部0.5864倍的工作面长度处,推进方向上位于0.5864倍的工作面推进距离处。通过正交试验分析得出底板挠度影响因素的显著性大小排序为:工作面长度>水压>推进度>地层倾角。层合板中上层层位边界为压应力区域,中部为拉应力区域,中下层层位则相反,剪应力分区域集中分布。工作面下侧区域各应力最大值均大于上侧区域的,表现出明显的非对称性。最后,确定了渗流稳定性评价指标及稳定条件:极限渗透系数(K_(li))与等效渗透系数(K_(eq))之比不小于1,即K_(li)/K_(eq)≥1。渗流稳定性影响因素的显著性大小为:水压>工作面长度>地层倾角,可为类似矿井的保水开采提供建议。

关键词：层合板模型倾斜煤层结构稳定性渗流稳定性等效渗透系数正交分析显著性分析

密集钻孔弱化坚硬顶板机理的数值模拟及应用研究

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Journal of Central South university 2023年第6期30卷 1865-1886页

作者：马军强李学华姚强岭夏泽徐强山长昊 Andrey SIDORENKO Aleksei APARIN Key Laboratory of Deep Coal Resource mining(Ministry of Education) China University of Mining and TechnologyXuzhou 221116China Faculty of mining Engineering Saint Petersburg Mining UniversitySaint Petersburg 199106Russia School of Mines China University of Mining and TechnologyXuzhou 221116China

煤矿坚硬顶板工作面回采后形成的侧向悬臂梁结构导致邻近工作面回采巷道和煤柱处于高应力状态,使得邻近工作面回采巷道围岩矿压显现剧烈。本文提出了一种密集钻孔诱导形成非连续弱面弱化坚硬顶板的技术方法。根据察哈素煤矿31315工作面... 详细信息

煤矿坚硬顶板工作面回采后形成的侧向悬臂梁结构导致邻近工作面回采巷道和煤柱处于高应力状态,使得邻近工作面回采巷道围岩矿压显现剧烈。本文提出了一种密集钻孔诱导形成非连续弱面弱化坚硬顶板的技术方法。根据察哈素煤矿31315工作面的工程地质条件,采用颗粒流数值计算软件PFC^(2D)建立了数值计算模型,研究了密集钻孔周围的应力响应机制和裂缝扩展规律。研究发现,密集钻孔开挖后,钻孔周围岩体因受集中应力而出现渐进性破坏并形成以最小水平主应力方向为长轴,最大水平主应力方向为短轴的椭圆形卸压区。同时,当钻孔直径(D)由30 mm增加到133 mm时,卸压区面积比(λ)从0增加到6.42%,卸压区宽度比(μ)从11.55%增加到54.6%。当钻孔间距(L)从300 mm增加到700 mm时,λ从30.86%减小到9.74%,μ从63.9%减小到33.2%,表明采用较大的直径和较小的间距能够提高密集钻孔对坚硬顶板岩层的弱化程度及卸压效果。现场工业性试验结果表明,密集钻孔诱导形成的非连续弱面有效地弱化了顶板岩层的强度,促进了工作面回采后侧向悬臂结构及时垮落,优化了巷道围岩所处的应力环境,保证了工作面生产安全。本研究为煤矿坚硬顶板的控制方案提供了一种新的技术方法。

关键词：密集钻孔非连续弱面切顶卸压回采巷道稳定性颗粒流数值计算软件(PFC^(2D))

Influence of polyolefin fibers on the strength and deformability properties of road pavement concrete

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第4期6卷 407-417页

作者： Olga Smirnova Alexey Kharitonov Yuriy Belentsov Department of Constructing mining Enterprises and Underground Structures Saint-Petersburg Mining UniversitySaint Petersburg 199106Russia Department of Technology of Building Materials and Metrology Saint-Petersburg State University of Architecture and Civil EngineeringSaint Petersburg 190005Russia Department of Building Materials and Technologies Emperor Alexander I St.Petersburg State Transport UniversitySaint Petersburg 190031Russia

Influence of the type and quantity of polyolefin fibers on the strength properties(compression strength, tensile strength in bending, strength in uniaxial tension), the deformation properties(elastic modulus, Poisson’s coefficient) and the abrasion resistance of cement concrete with water-to-cement ratio within 0.31 e0.55 were stated in the paper.The ways of fibers introduction into fresh concrete were investigated. It was shown that the fibers introduction method and procedure of mixing are the ways to improve the fibers uniform distribution in fresh concrete. The increase of the bending tensile strength and the uniaxial tensile strength of concrete with fibers reinforcement in comparison with the reference concrete was observed with the water-to-cement ratio decrease. The increase of uniaxial tensile strength at age of 28 days for concrete with macrofibers in amount of4.5 kg/m^3 was 23% and 29%;for macrofibers in quantity of 3 kg/m^3 was 19% and 26% with water-cement ratio equal to 0.49 and 0.31, respectively. The maximum reduction of abrasion in the range of 7.5%e10% was observed in concrete with water-to-cement ratio within0.44 e0.55 for all investigated types of fibers. The influence of fibers on the concrete abrasion with lower W/C ratio was negligible. The results can contribute to the rational use of modified polyolefin fibers in road pavement concrete.

关键词： Road pavement concrete Polyolefin fibers Strength Elastic modulus Abrasion Water-to-cement ratio

液态二氧化碳对俄罗斯某油藏稠油的膨胀与萃取作用实验

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石油勘探与开发 2018年第5期45卷 861-868页

作者： LOBANOV A A SHHEKOLDIN K A STRUCHKOV I A ZVONKOV M A HLAN M V PUSTOVA E J KOVALENKO V A ZOLOTUKHIN A B Northern(Arctic)Federal university ArkhangelskRussian Federation JSC RITEK SamaraRussian Federation Saint-Petersburg Mining University Saint PetersburgRussian Federation

利用俄罗斯某油藏稠油样品,通过实验分析稠油与液态CO_2混合后两者之间的质量传递作用以及混合物中重相(稠油和CO_2的混合物)和轻相(纯CO_2)的特性变化。研究表明,当混合物中CO_2浓度为10%时,稠油基本上不发生膨胀;当混合物中CO_2浓度高... 详细信息

利用俄罗斯某油藏稠油样品,通过实验分析稠油与液态CO_2混合后两者之间的质量传递作用以及混合物中重相(稠油和CO_2的混合物)和轻相(纯CO_2)的特性变化。研究表明,当混合物中CO_2浓度为10%时,稠油基本上不发生膨胀;当混合物中CO_2浓度高于26%时,由于稠油轻质组分的萃取量超过了CO_2在稠油中的饱和量导致重相体积减少,重相黏度呈指数增长,混合物中CO_2的浓度为26%时,有效降低重相黏度的作用最强;重相和轻相密度、体积系数、气体溶解度和闪蒸重相黏度均随着混合物中CO_2浓度的增加而变大;混合物中最佳的CO_2浓度是26%,此时稠油膨胀最大、重相的黏度值最小;混合物中CO_2的浓度为10%~26%时,轻相的体积最小,驱油效果最好。

关键词：提高采收率 CO2 稠油膨胀实验萃取实验相态特征

Swelling/extraction test of Russian reservoir heavy oil by liquid carbon dioxide

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Petroleum Exploration and Development 2018年第5期45卷 918-926页

作者： LOBANOV A A SHHEKOLDIN K A STRUCHKOV I A ZVONKOV M A HLAN M V PUSTOVA E J KOVALENKO V A ZOLOTUKHIN A B Northern Arctic Federal university JSC RITEK Saint-Petersburg Mining University

The mass transfer between heavy oil and liquid carbon dioxide and the changes of the heavy phase(mixture of heavy oil and CO_2) and light phase(pure CO_2) in the mixture were tested in lab with heavy oil samples from Russia. The experimental results showed that the heavy oil hardly expanded when the concentration of carbon dioxide in the mixture was 10%. When the concentration of carbon dioxide was higher than 26%, the volume of the heavy phase decreased, and the viscosity of the heavy phase increased exponentially as the light components extracted from the heavy oil exceeded the carbon dioxide saturated in the heavy oil. When the concentration of carbon dioxide in the mixture was 26%, the effect of viscosity reducing to the heavy phase was the strongest. The density of the light and heavy phases, volume factor, and solubility of gas and flash viscosity of heavy phase all increased with the rise of carbon dioxide concentration in the mixture. The best concentration of carbon dioxide in the mixture was 26%, when the heavy oil expanded the most and the viscosity of the heavy phase was the lowest. When the concentration of carbon dioxide in the mixture was between 10% and 26%, the volume of the light phase was the smallest and the oil displacement effect was the best.

关键词： enhanced oil recovery liquid CO2 heavy oil swelling test extract test phase behavior

Investigation of the influences of asphaltene deposition on oilfield development using reservoir simulation

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Petroleum Exploration and Development 2022年第5期49卷 1138-1149页

作者： TANANYKHIN D S STRUCHKOV I A KHORMALI A ROSCHIN P V Saint-Petersburg Mining University Saint-Petersburg 199106Russia LLC Tyumen Petroleum Research Center Tyumen 625000Russia Department of Chemistry Faculty of Basic Sciences and EngineeringGonbad Kavous UniversityGonbad Kavous 49717-99151Iran LLC SamaraNIPIneft Samara 443010Russia

This paper investigates the deposition of asphaltenes in the porous medium of the studied field in Russia and predicts production profiles based on uncertainty evaluation. This problem can be solved by dynamic modeling, during which production profiles are estimated in two scenarios: with and without the activation of the asphaltene option. Calculations are carried out for two development scenarios: field operation under natural depletion and water injection into the aquifer as a reservoir pressure maintenance system. A full-scale compositional reservoir simulation model of the Russian oilfield was created. Within a dynamic simulation, the asphaltene option was activated and the asphaltene behavior in oil and porous medium was tuned according to our own special laboratory experiments. The model was also matched to production historical data, and a pattern model was prepared using the full-scale simulation model. Technological and the asphaltene option parameters were used in sensitivity and an uncertainty evaluation. Furthermore, probable production profiles within a forecast period were estimated. The sensitivity analysis of the pattern model to input parameters of the asphaltene option allowed determining the following heavy-hitters on the objective function: the molar weight of dissolved asphaltenes as a function of pressure, the asphaltene dissociation rate, the asphaltene adsorption coefficient and the critical velocity of oil movement in the reservoir. Under the natural depletion scenario, our simulations show a significant decrease in reservoir pressure and the formation of drawdown cones leading to asphaltene deposition in the bottom-hole area of production wells, decreasing their productivity. Water injection generally allows us to significantly reduce the volume of asphaltene phase transitions and has a positive effect on cumulative oil production. Injecting water into aquifer can keep the formation pressure long above the pressure for asphaltene precipitation, preventing the asphaltene deposition resul

关键词： oilfield development asphaltene deposition uncertainty evaluation sensitivity analysis compositional reservoir simulation

Substituted diamides of dipicolinic acid as extractants and ionophores for rare earth metals

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Journal of Rare Earths 2023年第8期41卷 1234-1241,I0005页

作者： Yingchao Ren Valery A.Polukeev Ekaterina V.Kenf Liudmila I.Tkachenko Mikhail Yu Alyapyshev Vasily A.Babain Andrey V.Nechaev Andrey V.Legin Dmitry O.Kirsanov Institute of Chemistry Saint-Petersburg UniversityPeterhofUniversitetsky Prospect 26198504Saint-PetersburgRussia JSVC Vekton Ul.2-oy Luch 9192019Saint-PetersburgRussia Khlopin Radium Institute 194021282nd Murinsky avRussia ThreeArc mining LLC Pr.Narodnogo Opolchenia 10198216Saint-PetersburgRussia Rusredmet Vosstanovleniya str.15bl.3198320St.PeterburgKrasnoe seloRussia

The variety of newly synthesized diamides of dipicolinic acid(DPA)bearing methyl-and oxymethyl substituents in various positions of phenyl ring was investigated as potential ligands for liquid-liquid extraction of rare earth metal ions and as membrane active compounds in plasticized polymeric membranes of potentiometric sensors.It is found that scandium is extracted with 2,6-pyridinedicarboxylic acid diamides similarly to heavy lanthanides,while yttrium is extracted together with light group lanthanides.DPA shows high selectivity for the separation of cadmium/zinc,lead/nickel or copper/nickel pairs.The four out of six studied ligands demonstrate significant potentiometric sensitivity towards scandium,yttrium and lanthanides in 10^(-7)-10^(-3)mol/L concentration range in nitric acid solutions.The trends in sensitivity values vary depending on a ligand structure and the highest values are observed for Sc^(3+)and heavy lanthanides.According to the evaluated selectivity Sm^(3+)is the most preferred ion,while La^(3+)is the most discriminated.The differences in sensor behavior in rare earth metal solutions assume that such devices can be applied in sensor arrays for potentiometric analysis of lanthanide mixtures.

关键词： Dipicolini cacid diamides Scandium Yttrium Lanthanides Extraction Potentiometric sensors

Thermodynamics and Ion Flotation of Lanthanides

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材料科学与工程（中英文A版） 2011年第6期1卷 849-852页

作者： Olga Leonidovna Lobacheva Natalya Vladimirovna Dzhevaga Dmitriy Eduardovich Chirkst saint-petersburg State mining university Saint-Petersburg 199106 Russia