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Calculation of Mass Concrete Temperature Containing Cooling Water Pipe Based on Substructure and Iteration Algorithm

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工程与科学中的计算机建模(英文) 2024年第1期138卷 813-826页

作者： Heng Zhang Chao Su Zhizhong Song zhenzhong shen Huiguang Lei Changjiang Institute of Survey PlanningDesign and ResearchWuhan430010China College ofWater Conservancy and Hydropower Engineering Hohai UniversityNanjing210098China Chief Engineer Office Wujiang Company of Goupitan Power Construction CooperationYuqing564408China

Mathematical physics equations are often utilized to describe physical phenomena in various fields of science and engineering.One such equation is the Fourier equation,which is a commonly used and effective method for evaluating the effectiveness of temperature control measures for mass concrete.One important measure for temperature control in mass concrete is the use of cooling water pipes.However,the mismatch of grids between large-scale concrete models and small-scale cooling pipe models can result in a significant waste of calculation time when using the finite element method.Moreover,the temperature of the water in the cooling pipe needs to be iteratively calculated during the thermal transfer process.The substructure method can effectively solve this problem,and it has been validated by scholars.The Abaqus/Python secondary development technology provides engineers with enough flexibility to combine the substructure method with an iteration algorithm,which enables the creation of a parametric modeling calculation for cooling water pipes.This paper proposes such a method,which involves iterating the water pipe boundary and establishing the water pipe unit substructure to numerically simulate the concrete temperature field that contains a cooling water pipe.To verify the feasibility and accuracy of the proposed method,two classic numerical examples were analyzed.The results showed that this method has good applicability in cooling pipe calculations.When the value of the iteration parameterαis 0.4,the boundary temperature of the cooling water pipes can meet the accuracy requirements after 4∼5 iterations,effectively improving the computational efficiency.Overall,this approach provides a useful tool for engineers to analyze the temperature control measures accurately and efficiently for mass concrete,such as cooling water pipes,using Abaqus/Python secondary development.

关键词： Fourier equation cooling water pipe mass concrete iteration algorithm

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Analysis on damage causes of built-in corridor in core rock-fill dam on thick overburden:A case study

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Frontiers of Structural and Civil Engineering 2022年第6期16卷 762-780页

作者： Jia’ao YU zhenzhong shen Zhangxin HUANG College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210024China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210024China

The stress state of the built-in corridor in core rock-fill dam on thick overburden is extremely complex,which may produce cracking and damage.The purpose of this paper was to investigate the effect of thick overburden on the stress and deformation of the built-in corridor in a rock-fill dam,and ascertain the damage causes of the corridor.The rationality of the analysis method for corridor with similar structure is another focus.The approach is based on finiteelement method and the calculation result accuracy is verified by the field monitoring data.The improved analysis method for corridors with similar structure is proposed by comparing various corridor load calculation methods and concrete constitutive models.Results demonstrate that the damage causes of the corridor are the deformability difference between the overburden and concrete and the special structural form.And the calculation model considering dam construction process,contact between concrete and surrounding soil,and concrete damage plasticity can reasonably reflect the mechanical behavior of the corridor.The research conclusions may have a reference significance for the analysis of tunnels similar to built-in corridors.

关键词： thick overburden built-in corridor stress deformation causes for damage concrete damaged plasticity

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Optimization design of anti-seismic engineering measures for intake tower based on non-dominated sorting genetic algorithm-Ⅱ

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Frontiers of Structural and Civil Engineering 2023年第9期17卷 1428-1441页

作者： Jia’ao YU zhenzhong shen Zhangxin HUANG Haoxuan LI State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210024China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210024China

High-rise intake towers in high-intensity seismic areas are prone to structural safety problems under vibration.Therefore,effective and low-cost anti-seismic engineering measures must be designed for protection.An intake tower in northwest China was considered the research object,and its natural vibration characteristics and dynamic response were first analyzed using the mode decomposition response spectrum method based on a three-dimensional finite element model.The non-dominated sorting genetic algorithm-II(NSGA-II)was adopted to optimize the anti-seismic scheme combination by comprehensively considering the dynamic tower response and variable project cost.Finally,the rationality of the original intake tower antiseismic design scheme was evaluated according to the obtained optimal solution set,and recommendations for improvement were proposed.The method adopted in this study may provide significant references for designing anti-seismic measures for high-rise structures such as intake towers located in high-intensity earthquake areas.

关键词： intake tower NSGA-II mode decomposition response spectrum method anti-seismic engineering measures optimization design variable project cost

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多元结构地基对防渗墙渗透溶蚀演化规律的影响

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地下空间与工程学报 2024年第1期20卷 287-301,310页

作者：甘磊刘源沈振中徐力群河海大学水利水电学院南京210098 河海大学水文水资源与水利工程科学国家重点实验室南京210098

深厚覆盖层地基渗透性能和厚度变化会影响坝基渗流场的分布,进而改变坝基防渗墙溶蚀演化进程。为研究多元结构地基变化对防渗墙渗透溶蚀的影响机制,结合流体力学、化学动力学理论和对流-扩散方程,提出覆盖层地基混凝土防渗墙渗透溶蚀耦... 详细信息

深厚覆盖层地基渗透性能和厚度变化会影响坝基渗流场的分布,进而改变坝基防渗墙溶蚀演化进程。为研究多元结构地基变化对防渗墙渗透溶蚀的影响机制,结合流体力学、化学动力学理论和对流-扩散方程,提出覆盖层地基混凝土防渗墙渗透溶蚀耦合分析模型,研究强透水层、弱透水层和第三透水层厚度及渗透系数对防渗墙中钙离子浓度、孔隙率和渗流特性的影响。结果表明:随服役年份增长,防渗墙钙离子浓度表现为先快速增长至峰值,随后不断下降的趋势,孔隙率和渗透系数呈指数型增长变化规律,大坝总渗透流量不断增大;各影响因素中,弱透水层渗透系数对防渗墙钙离子浓度、孔隙率和大坝总渗流量的影响最大,其次为强透水层厚度及其渗透系数;各工况下混凝土防渗墙使用年限为38.46~44.00年。研究成果可为深厚覆盖层多元结构地基上的土石坝工程的长效服役性能评估提供理论依据。

关键词：多元结构地基混凝土防渗墙渗透溶蚀孔隙率渗流特性

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土工席垫与排渗墙相结合的尾矿库渗控效果分析

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有色金属（矿山部分） 2024年第4期76卷 74-80页

作者：李雪辰沈振中河海大学水利水电学院南京210098 河海大学水文水资源与水利工程科学国家重点实验室南京210098

目的:土工席垫具有良好的集水和排水作用,但尾矿库在长期运行后,土工席垫经常出现因淤堵而失效的现象,这会导致坝体内部排水不充分,浸润面升高,进而增加渗透破坏的可能性,为此提出增设排渗墙来解决土工席垫失效引起的排渗安全问题。方法... 详细信息

目的:土工席垫具有良好的集水和排水作用,但尾矿库在长期运行后,土工席垫经常出现因淤堵而失效的现象,这会导致坝体内部排水不充分,浸润面升高,进而增加渗透破坏的可能性,为此提出增设排渗墙来解决土工席垫失效引起的排渗安全问题。方法:以某尾矿库工程为例,采用饱和-非饱和渗流计算理论,计算分析了土工席垫不同失效程度下以及增设排渗墙后渗流场的变化。结果:结果表明:随着土工席垫失效程度逐渐加深,尾矿库坝体内部浸润线会逐渐升高,直至不能满足渗流控制要求。结论:在增设排渗墙后,可以有效控制坝体内浸润线埋深,提高坝体的排渗能力,满足安全要求。

关键词：尾矿库渗流场土工席垫排渗墙排渗效果

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Comparative Analysis of Tunnel Seepage Field under Different Waterproof and Drainage System Using Analytical Methods

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Engineering（科研） 2020年第6期12卷 401-423页

作者： Serges Mendomo Meye zhenzhong shen State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing China College of Water Conservancy and Hydropower Engineering Hohai University Nanjing China

Tunnel seepage is an important factor affecting the progress and safety of tunnel construction. In this paper, the mining method tunnel construction in the water-rich weathered granite stratum is taken as the research object. Through the analytical calculation method, the distribution law of tunnel seepage field under different waterproof and drainage types is studied, and the comparative analysis is carried out. According to the analytical solution, the influencing factors of grouting parameters are proposed. The sensitivity of the tunnel seepage field to the variation of grouting parameters is analyzed. A novel waterproof and drainage system, and construction technology suitable for subway tunnels with large buried depth below groundwater level were proposed.

关键词： Seepage Field Waterproof Analytical Solutions Tunnel Controlled Drainage

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Research on the Permeability Characteristics of Granite with Different Weathering Degrees before and after the Influence of Mining Method Construction

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Engineering（科研） 2020年第6期12卷 382-400页

The influence of mining method tunnel construction on the groundwater environment is a very important and complex engineering environment problem, and the strong differential weathering of water-rich granite strata increases the difficulty of this problem. In this paper, the mineral composition and microstructure characteristics of granite with different weathering degrees before and after the influence of mining method were studied by in-situ and indoor seepage tests and theoretical calculation, and the impact of mining method tunneling on granite permeability was also analyzed. Calculation results revealed that the permeability coefficient of surrounding rock at 1.1 m away from excavation face increased 41.6 times as much as the original. The permeability coefficient of moderately and strongly weathered granite increased by 6.12 and 3.33 times, respectively and the permeability also increased. The variation of the permeability coefficient of fully weathered granite was the smallest, increasing by 1.67 times, which is due to mechanical excavation of a fully weathered layer on-site, and the disturbance was far less than that caused by blasting. The scale of the excavation damaged zone (EDZ) induced by mining method was determined by wave velocity test, which provides a basis for subsequent seepage field calculation and research.

关键词： Mining Method Granite Permeability EDZ Groundwater Environment Weathered Granite

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Numerical Simulation of the Influence of Tunnel Construction by Mining Method on the Seepage Field in Weathered Granite Stratum

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Engineering（科研） 2020年第6期12卷 424-456页

In actual space, considering the heterogeneity and anisotropy of rock and soil, the difference of hydrogeological conditions and the influence of tunnel excavation, tunnel seepage problem is a very complex three-dimensional seepage problem, which is very difficult to solve. The equivalent continuum model is one of the most commonly simplified models used in solving tunnel seepage problems. In this paper, the finite element software ABAQUS and the research results are used to establish a seepage numerical calculation model, study the influence of mining method construction on the seepage field in weathered granite, and clarify the influence of each stage of mining method construction on the groundwater environment. On this basis, the sensitivity of the seepage field to various factors such as natural environment, engineering geology and hydrogeology, tunnel construction and so on is analyzed, which provides a basis to establish the evaluation system of groundwater environment negative effect in weathered granite stratum by mining method tunnel construction.

关键词： Seepage Field ABAQUS Weathered Granite Mining Method

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利培酮联合无抽搐电休克治疗女性慢性精神分裂症的效果分析

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中国社区医师 2024年第4期40卷 49-51页

作者：朱永兴沈振中唐芙蓉陈梦云徐州市东方人民医院精神科江苏徐州221004

目的:分析利培酮联合无抽搐电休克治疗女性慢性精神分裂症的效果。方法:选取2022年1月—2023年5月徐州市东方人民医院收治的70例慢性精神分裂症女性患者作为研究对象,以随机数字表法分为两组,各35例。对照组采用利培酮治疗,观察组在对... 详细信息

目的:分析利培酮联合无抽搐电休克治疗女性慢性精神分裂症的效果。方法:选取2022年1月—2023年5月徐州市东方人民医院收治的70例慢性精神分裂症女性患者作为研究对象,以随机数字表法分为两组,各35例。对照组采用利培酮治疗,观察组在对照组基础上采用无抽搐电休克治疗。比较两组治疗效果。结果:两组不良反应总发生率比较,差异无统计学意义(P>0.05)。治疗前,两组5-羟色胺(5-HT)、多巴胺(DA)以及去甲肾上腺素(NE)水平比较,差异无统计学意义(P>0.05);治疗后,两组5-HT、DA、NE水平高于治疗前,且观察组高于对照组,差异有统计学意义(P0.05);治疗后,两组阳性症状、阴性症状、一般精神病理评分及总分低于治疗前,且观察组低于对照组,差异有统计学意义(P<0.05)。观察组治疗总有效率高于对照组,差异有统计学意义(P=0.022)。结论:利培酮联合无抽搐电休克治疗女性慢性精神分裂症的效果较好,可以改善患者神经递质水平与临床症状,且不会增加不良反应。

关键词：慢性精神分裂症女性利培酮无抽搐电休克

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Carbon Fiber Breakage Mechanism in Aluminum(Al)/Carbon Fibers(CFs) Composite Sheet during Accumulative Roll Bonding(ARB) Process

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 167-173页

作者：胡淑芬 SUN zhenzhong shen Fanghua DENG Jun 杨卫平杨浩坤 School of Engineering Jiangxi Agricultural UniversityNanchang 330045China School of Mechanical Engineering Dongguan University of TechnologyDongguan 510730China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan 510730China Smart Manufacturing Division Hong Kong Productivity Council78 Tat Chee AvenueHong Kong 5999075China

We put forward a method of fabricating Aluminum(Al)/carbon fibers(CFs) composite sheets by the accumulative roll bonding(ARB) method. The finished Al/CFs composite sheet has CFs and pure Al sheets as sandwich and surface layers. After cross-section observation of the Al/CFs composite sheet, we found that the CFs discretely distributed within the sandwich layer. Besides, the tensile test showed that the contribution of the sandwich CFs layer to tensile strength was less than 11% compared with annealed pure Al sheet. With ex-situ observation of the CFs breakage evolution with-16%,-32%, and-45% rolling reduction during the ARB process, the plastic instability of the Al layer was found to bring shear damages to the CFs. At last, the bridging strengthening mechanism introduced by CFs was sacrificed. We provide new insight into and instruction on Al/CFs composite sheet preparation method and processing parameters.

关键词： Al/CFs composite sheet accumulative roll bonding tensile strength plastic instability carbon fiber breakage

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