2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)最新文献

{"title":"Numerical Analysis of the Influence of Tunnel Excavation on the Changes of Surrounding Rock Stress and Displacement","authors":"Libo Ding, Xing Chen, Youchuan Wu, Xiaopeng Wang","doi":"10.1109/ICHCESWIDR54323.2021.9656197","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656197","url":null,"abstract":"The Argveta exit of No. 2 Tunnel in Georgia is taken as the research object, and the three-dimensional geological numerical analysis model of the tunnel is established. The model simulates the construction condition of full-section tunnel excavation through passivation, and discusses the variation law of stress and displacement caused by excavation. According to the study results, with the construction of the tunnel, the surrounding rock pressure increases gradually, which has a lot to do with the tunnel excavation footage and temporary support time; the deformation of tunnel entrance is greatly affected by tunnel excavation, which has a gradual Increasing trend; for the simultaneous construction of tunnels with different spans, the impact of the excavation of a large-span tunnel on the rock, soil, temporary lining and the secondary lining is greater than the stress and deformation of a small-span tunnel.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127382549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vacuum preloading and geo-synthetics utilization, a promising preparation for the marine clay","authors":"Ming-Yuan Wang, Yajun Wang, Z. Shan, Zhuo Sun, Zunbang Xi, Kuan-jun Wang, Guo Li","doi":"10.1109/ICHCESWIDR54323.2021.9656380","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656380","url":null,"abstract":"The study focused on the marine clay preparation with the vacuum preloading and geo-synthetics the effect of which would be investigated comprehensively. The applicable experimental models and programs were given and the geo-parameters were investigated after the preparation. The results of the model experiments showed that the vacuum preloading and geo-synthetics utilization was a promising treatment for the marine clay which has been consolidated successfully.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127547479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear lag effect formula of corrugated steel webs based on spring model","authors":"Saidong Wei, Xiaoguang Wu","doi":"10.1109/ICHCESWIDR54323.2021.9656338","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656338","url":null,"abstract":"The stress characteristics of composite box girder with corrugated steel webs are quite different from those of ordinary concrete box girder. In order to study the normal stress distribution law of the upper and lower flange plates of the corrugated steel web shear lag effect, the corrugated steel web flange plate is reasonably equivalent to the longitudinal parallel parallel spring model. The minimum potential energy principle is used to understand the warping displacement function form of the corrugated steel web, and the normal stress distribution of the wing plate is obtained. Finally, the calculation formula for the normal stress distribution of the corrugated steel web flange plate is obtained. By comparing the calculated values and the measured values with the finite element values, it is found that the formula has good applicability to solve the normal stress distribution of corrugated steel web box girder under shear lag effect.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130094446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative analysis on the influence of foundation pit excavation and enclosure construction on subway deformation","authors":"Minxin Luo, Yun Chen, Jia-sheng Huang, C. Liang","doi":"10.1109/ICHCESWIDR54323.2021.9656242","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656242","url":null,"abstract":"As the development and utilization of underground space, underground engineering projects adjacent to the subway tunnel increase daily, and the effects of underground engineering construction on the tunnel become noticeable. Based on the foundation pit project neighboring Hangzhou metro line 1, in situ measurement results are used to analyze the horizontal and vertical displacement, alone with horizontal convergence, before and during the excavation. It’s found that the disturbance during the construction of the enclosure structure has a significant effect on the tunnel deformation.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122352403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Future drought projection of Southwestern China based on CMIP5 model and MCI index","authors":"Xiehui Li, Feiyang Mao, Lei Wang, Jingkun Yang","doi":"10.1109/ICHCESWIDR54323.2021.9656446","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656446","url":null,"abstract":"In the past 50 years, Southwestern China has suffered from frequent, intense droughts. MCI (meteorological drought composite index) was calculated, and ArcGIS Spatial Analyst was run in the present study. The simulation performance was compared between different CMIP5 models. Then we projected the temporal and spatial distributions of drought in the intermediate path (RCP4.5 scenario) in the two time periods (2018-2058 and 2059-2099) between 2018 and 2099. The results showed that (1) the number of days with moderate drought and above increased in Southwestern China in both two time periods. The high-value regions were mainly found at the borders between Sichuan and Yunnan Province from 2018 to 2099. The annual number of drought days was generally above 150d. The low-value regions were mainly found in some parts of southeastern Sichuan, Chongqing, and the large parts of Guizhou. The annual average number of drought days was generally below 100d; (2) At phase P1 (from 2018 to 2058), the projected spatial distribution of drought severity was generally consistent with that of the annual average number of days with moderate drought and above. At phase P2 (from 2059 to 2099), the high-value regions of drought severity were still primarily found at the borders between Sichuan and Yunnan Province. The low-value regions were mainly found in the large parts of Chongqing and Guizhou. As time progressed, the high-value regions of drought severity expanded, and the drought was aggravated; (3) At phase P1, the high-value regions of drought frequency were mainly found at the borders between Sichuan and Yunnan. In these regions, the drought frequency was above 80%. The low-value regions of drought frequency were mainly found in parts of western Guizhou and central and eastern Sichuan. In these regions, the drought frequency was below 20%. At phase P2, the high-value regions of drought frequency were generally found in Yunnan Province and southwestern Sichuan. In these regions, the drought frequency was above 60%. The low-value regions of drought frequency were mainly found in Chongqing and northern Guizhou. In these regions, the drought frequency was below 20%. From phase P1 to P2, the high-value regions of drought frequency expanded, and the drought frequency increased. The low-value regions of drought frequency shrank in size. The drought frequency also decreased. Taken together, the drought in Southwestern China was aggravated and occurred more frequently according to the projections from 2018 to 2099. Our research findings offered important guidance for drought early warning and prevention in Southwestern China.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130681209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on Integration of Solar Heating Technology for Rural Self-Sufficiency House in Cold Areas Take Beijing and surrounding areas as an example","authors":"Wei Gao, Haoran Ding, Mei Zhao, Huihua Li","doi":"10.1109/ICHCESWIDR54323.2021.9656431","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656431","url":null,"abstract":"Under the guidance of the national clean heating policy, the winter heating methods in cold rural areas need to be updated urgently. Taking rural solar heating technology as target, this paper puts forward the concept of heating technology integration. After analyzing the current status and problems of solar heating technology applied to rural houses, this paper also discusses the key points of design and integration between self-sufficiency houses and solar heating technology from active and passive solar heating technology. Finally, there are reasonable suggestions for the selection of heating technology for the self-sufficiency houses.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132069829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of sodium hydroxide concentration on the performance of alkali-activated recycled cement-based materials","authors":"Zunbang Xi, ZuoQi Sun, Jianming Wu, Yuchen Fu, Yajun Wang, Haifeng Xiu","doi":"10.1109/ICHCESWIDR54323.2021.9656399","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656399","url":null,"abstract":"Compared with traditional cement, alkai-activated cementitious materials have higher strength, lower hydration heat, simple manufacturing process and less investment. At the same time, this paper uses recyced cement-based materials, the combination of the two groups also conforms to the principle of green, low energy consumption. In this paper, sodium hydroxide was used as alkali excitation reagent to study the macroscopic compressive strength of samples under different concentrations of sodium hydroxide and the influence of calcium carbonate content on macroscopic strength at microscopic scale.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130883662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on reciprocal relationship among water amount-water quality-water efficiency based on the SWAT_WAQER model : —A case study of the Yulin catchment","authors":"Mingzhi Yang, Guang-Zheng Wu, Suge Zhu, Sinuo Li","doi":"10.1109/ICHCESWIDR54323.2021.9656345","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656345","url":null,"abstract":"In order to quantitatively analyze the interrelationship among total water consumption, water use efficiency and river water quality, this paper takes the Yulin Basin as the study object and constructs a “quantity-quality-efficiency” joint regulation model based on SWAT_WAQER, and calibrates runoff and water quality. By setting five scenarios of industrial water use efficiency and agricultural irrigation water use efficiency, the SWAT_WAQER model is used to simulate and analyze the total water consumption, pollution emission, and response state of water quality of river cross-sections under each scenario, and to analyze the interaction among them. The results show that the SWAT_WAQER model constructed in this paper performs well and it is applicable for changes in national economy water consumption, pollutants discharged into rivers and river water quality concentration under different water conservation scenarios. In the Yulin Basin, water consumption of per CNY 10,000 of industrial added value, industrial water consumption and river water quality up-to-standard rate show a linkage relationship of simultaneous decrease and simultaneous increase; water efficiency of irrigation, irrigation water use and water quality up-to-standard rate show a linkage relationship of “as one falls, another rises”; changes in water consumption of per CNY 10,000 of industrial added value have obvious influence on river water quality concentration, but changes in water efficiency of irrigation have limited influence on river water quality concentration.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129309154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the dynamic response of the powerhouse under the vibration load of the Hydropower Station","authors":"Xiaoxin Zhang, Jianping Zeng, Bin Wu, J. Gu","doi":"10.1109/ICHCESWIDR54323.2021.9656465","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656465","url":null,"abstract":"The vibration problem of hydro-turbine generator sets is very complicated. There are examples at home and abroad that the vibration of the generator sets causes the vibration of the plant structure, and even causes the structural damage to affect the normal operation of the power station. The Hydropower Station is a second-class (2) type project. In order to study the dynamic response of the plant under the vibration load of the unit, the finite element dynamic time history method is adopted, and the vibration loads are assumed to be simple harmonic loads. The dynamic response of the plant under the four working conditions are calculated, namely the rated operating conditions, two-phase short-circuit condition, half-magnet short-circuit condition and unit out-of-step condition. The calculation results show that under the four vibration response calculation conditions, the structural deformation is concentrated at the loading position of the machine pier. The dynamic displacements of the stator base section and the bottom section of the machine pier are relatively small and relatively evenly distributed. The stress concentration (or larger stress area) mainly occurs in the machine pier, and the dynamic stress in other parts of the plant is small. It is said that the stress concentration in the load application point and its nearby area is obvious. The displacement of the unit structure in all directions, the maximum root mean square velocity and the maximum root mean square acceleration value, and the vibration stress in each direction did not exceed the allowable value. The plant is safe under the vibration load of the unit.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126246061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Diameter and Thickness of Tunnel Lining on Anti-deforming Capability","authors":"Qing Li","doi":"10.1109/ICHCESWIDR54323.2021.9656299","DOIUrl":"https://doi.org/10.1109/ICHCESWIDR54323.2021.9656299","url":null,"abstract":"At present, there is no unified standard for the selection of the dimension of tunnel lining such as inner diameter and thickness in practical engineering. On this condition, the optimization of the dimension of lining is still a subject to be explored. A series of model tests with a geometric similarity ratio of 1:10 is conducted to study the anti-deforming capability of the lining structure with different inner diameters and thicknesses. The condition of overloading is considered by changing the ratio of the horizontal and vertical loads. The test results show that the overall deformation, local strain and the bending moment develop approximately linearly and slowly during the beginning stages of loading, however nonlinearly and rapidly during the overloading. The increase of the inner diameter of the lining leads to the increase of the convergence, maximum tensile strain, and internal force, which makes the lining into a more dangerous stress state. The increase of the lining’s thickness leads to the increase of internal force, but also leads to the decrease of the convergence and maximum tensile strain, which leads the lining into a safer stress state.","PeriodicalId":425834,"journal":{"name":"2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121532124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}