bluuebunny/crossref_metadata_2025_split huggingface dataset:
Selection and optimization of water filling scheme in front of super-high arch dam
Authors: Li Jintao , Tan Yaosheng , Liu Chunfeng , Liu Yang , Liu Youzhi 
Published: June 2021

Abstract
During the construction of super-high arch dam, the timing of water filling in front of the dam is the key link in the safety management and control of arch dam. Besides the cantilever of dam and the transverse joint aperture of concrete arch dam, the stress in the corridor area at the bottom of the dam should be considered for the timing of water filling in the dam. In this paper, Baihetan super-high arch dam project was taken as an example to study this problem, and the risk of overall dam overhang under gravity load and the influence of different water levels on the transverse joint aperture and stress in the corridor area was systematically analyzed. The research results showed that different water level elevations have obvious influence on the transverse joint aperture and stress state in corridor area, and the selection of water level elevations needs to comprehensively consider the mutual coupling relationship among these influencing factors, so as to realize the effective control of dam safety risk.
Environmental-friendly drilling fluid system in offshore natural gas hydrate formations
Authors: Zhang Yubin , Qiu Zhengsong , Zhao Xin , Ma Yongle , Mu Jiaxing , Liu Yunfan 
Published: June 2021

Abstract
There are abundant natural gas hydrate resources in offshore. However, the development of drilling fluid system is restricted by low ambient temperature, special formation conditions of weak cementation and high environmental protection requirements of marine discharge. In this paper, a new environmental-friendly drilling fluid system in offshore gas hydrate formations has been developed by optimizing the additives. The comprehensive evaluation shows that the freezing point of the drilling fluid can reach -10 °C, and it still has good rheological properties at 4 °C. The apparent viscosity ratio of the drilling fluid is less than 1.3, and the fluid filtration is only 4 mL. With good shale hydration inhibition, it can significantly reduce the swelling ratio and increase the cuttings dispersion recovery radio. There is no hydrate formation in drilling fluid for 24 hours at 4 °C and 10 MPa simulated conditions, which shows a good ability to inhibit gas hydrate formation. At the same time, compared with the experimental fluid without hydrate decomposition inhibitor, the drilling fluid can delay hydrate decomposition. In addition, the drilling fluid has good environmental protection performance, which can meet the requirements of high environmental protection in offshore.
Study on Shaking Table Test of Underground Substation Considering Soil-Structure-Equipment Interaction
Authors: Zheng Hongyu , Wen Bo 
Published: June 2021

Abstract
The electrical equipment has a large quality proportion, and the interaction between equipment and structure cannot be ignored, especially under seismic loads. A 1/25 scale model was designed and made for shaking table test to study its seismic performance, and the acceleration and displacement responses of soil, structure and equipment under unidirectional and bidirectional ground motions were analyzed respectively. The test results show that the acceleration response of the structure and soil increases gradually from bottom to top under the soil-structure-equipment interaction. The acceleration response of equipment is greater than that of the floor where it is located, and it is greater at the position of the side column than that at the position of the central column. The acceleration amplification factor of the soil adjacent to the structure is much larger than that of the soil far away from the structure relative to that at the bottom of the layered shear box.
The earthquake under the action of underground structure and the influence of the distance between adjacent buildings
Authors: Liu Pengjun , Zheng Guodong , Zhang Qishuo 
Published: June 2021

Abstract
With the large-scale construction of urban rail transit in China, subways often cross the bottom of surface buildings or are located near them. In order to study the complex catastrophic correlation effects of the underground structure of the subway, the soil and the adjacent existing structures under earthquakes. We carried out numerical simulation calculations to study the effects of underground structures and adjacent existing structures under earthquakes. The interaction law of nearby existing buildings, the influence mechanism of the neighboring building’s depth factors on the seismic response of the complex system, and the system’s seismic response law were determined.
Moisture Content Distribution and Variation Law of Highway Subgrade in High-Latitude and Low-Altitude Deep Seasonal Frozen Ground Region
Authors: Gao Wei , Sun Wei , Wang Xu , Dong Naibao 
Published: June 2021

Abstract
According to the tracking observation of the highway subgrade moisture content in the high-latitude and low-altitude seasonal frozen ground region in Heilongjiang province, the time-varying variation law of the subgrade moisture content and the distribution state of the subgrade moisture content at different depths are analysed to confirm that the distribution pattern of moisture content in fine-grained soil subgrade does not strictly conform to capillary ascent distribution law of groundwater (or surface water), which is related to the coverage and gap of the pavement, slope water seepage and water-holding capacity of the subgrade soil. In general, the distribution state can be roughly divided into B distribution, C distribution, D distribution and S distribution. As the distribution of subgrade moisture content is no longer the conventional pattern of “low up and high down”, the control of subgrade height should not be rigidly stuck to the subgrade height controlled by capillary ascent height, while multiple measures should be taken to ensure water temperature and strength stability of subgrade.
Calculation of common evaluation indexes for heritage evaluation of water conservancy projects
Authors: Lu Bing , Yao Jianfeng , Ding Mengjiao , Chen Siyu , Wang Hanxiao 
Published: June 2021

Abstract
In this article, through further study of water conservancy engineering heritage, compiled a set of system of water conservancy engineering heritage research evaluation methods, namely analytic hierarchy process (AHP) method combined with the Delphi evaluation, through this research, hope that through quantifiable data model and offer reference for evaluation of the water conservancy engineering heritage. Thus, the system protection, effective management and rational utilization of water conservancy heritage can be better promoted.
An Effectiveness Study of SPC Control Charts on the Quality Control for Construction in Asphalt Pavement
Authors: Xu Zhiyong , Zhou Qiang , Chen Gang , Wang Yun , Yang Xiongwei , Liu Zhen 
Published: June 2021

Abstract
Aiming at the problems of insufficient dynamic control and data mining of Expressway pavement construction quality in Yunnan, this paper analyzes the application of Exponentially Weighted Moving Average (EWMA) control chart in dynamic control of Expressway asphalt pavement construction quality. Firstly, the quality characteristic value of pavement construction is defined as the data type of multiple variation sources, and the mathematical model of multiple variation sources is studied to solve the problem of excessive false alarm. Then, on the theoretical basis of statistical process control (SPC), the paper compares and analyzes the three control chart schemes of traditional Hugh Hart control chart, Tabular Cumulative Sum (CUSUM) control chart and EWMA control chart, and concludes that the application effect of EWMA control chart is obviously better than the other methods in the aspects of applicability and inspection output. Finally, combining with the measured data of asphalt mixture temperature and asphalt weight in pavement construction, EWMA control diagram is used to carry out practical research, and the results are better.
The Standardization System of Water Conservancy Project Cost Management under the EPC General Contract Mode
Authors: Li Sha , Wang Yijia , Zeng Yu 
Published: June 2021

Abstract
It is the development trend for water conservancy project to adopt EPC general contract mode. The realization of scientific and effective project cost management under total price contract is the key to guarantee the contractor’s economic benefit. Based on the contractor’s perspective, this paper sorts out the content of cost management at each stage, clarifies the responsible subject of cost management at each stage, and explores the construction of cost management standardization system.
Turbidity Removal of Landscape Water by Filtration Bed with Suspended Media
Authors: Zhang B H , Ren Y X , Liu H , Guo D , Shao Y H 
Published: June 2021

Abstract
High turbidity seriously affects the landscape effect of urban landscape water. In order to explore the turbidity removal effect of filtration bed with suspended media materials on landscape water, a filtration test was carried out with Xinhe river in Fengxi new city. The results showed that the filter bed had an effective and reliable removal performance on turbidity and suspended solids in landscape water. The turbidity removal rates were 44.50%-77.24%, and the suspended solid removal rates were 50.37%-78.85%. The use of expended polystyrene filter media material and upward flow direction got higher remove effect of the turbidity. Suspended solid particles with size less than 100 μm is the limiting factor affecting the treatment effect of the filter bed, and the expanded polystyrene filter material had a better removal effect on the particulate matter in this range. On the premise of ensuring the treatment effect, the filter bed with suspended media has the advantages of low backwash energy consumption and long filtration period, therefore, it is suitable to be used as the pre-treatment unit of landscape water treatment project.
The characteristics of internal and accumulated pores of calcareous sand
Authors: Yu J. Y. , Gao Y. , Li W. L. , Chen Q. 
Published: June 2021

Abstract
Calcareous sand is characterized by irregular shapes and high porosity, which makes its engineering properties more special. Based on the calcareous sand from a reef island in the South China Sea, the characteristics of the internal pores and the accumulated pores between the calcareous sand particles were explored by a microscopic system and image analysis techniques. The results show that for calcareous sand particles with different particle sizes, the distributions of internal pores and accumulated pores follow the exponential distribution. The probability distribution of internal pores is the same as that of accumulated pores, and the area of accumulated pores between particles is about 100 times that of internal pores of particle itself. The characteristics of accumulated pores are affected by the size and shape of the particles.
Dynamic performance of a new type of damping and wind-resistant bearing in the Nizhou waterway bridge of Nansha Bridge
Authors: Zhou X D , Zhu P , Zhang X M 
Published: June 2021

Abstract
In order to optimize the transverse structural system of the 1688m long-span steel box girder suspension bridge (Nizhou waterway bridge of Nansha Bridge), a new type of lateral damping energy-consuming wind-resistant bearing is proposed, and the quasi-static test is carried out. Also, the nonlinear time-history analysis method is used to compare and analyze the influence of the lateral fixed restraint and the new lateral damping energy-consuming wind-resistant bearing on the bridge tower internal force, main beam internal force, main beam displacement and rotation angle of the long-span suspension bridge. The research results show that, the new lateral damping energy-consuming wind-resistant bearing has good hysteretic energy consumption; compared with the conventional wind-resistant bearing, the seismic performance is better than the pylon which setting the horizontal fixed constraint, transverse bending moment of the pylon is smaller when adopting the new lateral damping energy-consuming wind-resistant bearing. The shearing force and bending moment of the main beam are obviously smaller than the transverse fixed restraint system, and decrease with the increase of the stroke of the bearing; the use of the new lateral damping wind-resistant bearing has little effect on the lateral displacement and rotation angle of the main beam.
Shear strength assessments of residual soil for Ia Pet wind power project in Vietnam
Authors: Wang Kuanjun , Li Linxian , Shen Kanmin , Ma Lili , Jin Junwu , Shi Ting 
Published: June 2021

Abstract
The geotechnical parameters are of great importance in wind turbine foundation design. As a case study, laboratory test results of Ia Pet wind power project in Vietnam were analysed to accurately estimate the strength of residual soil, which is classified as high plasticity silt (MH). Due to sample disturbance, the undrained shear strength s
u from triaxial unconsolidated undrained shear test (UU) is absolutely underestimated, while su from direct quick shear tests (DSq) and triaxial consolidated undrained shear test (CU) are more representative. Good linear correlations have been found between soil depth and strength obtained from DSq and CU tests. The normalised undrained shear strengths s
u/σ
v0’ indicate that the residual soil at 0m to 8m is heavily overconsolidated, where s
u/σ
v0’ is larger than 0.4. Furthermore, the normalised undrained shear strengths s
u/σ
v0’ presented negative linear correlation of liquidity index, which can be used to quick and cautious estimate the strength of Ia pet residual soil in the future by using liquidity index. The undrained shear strength evaluation using liquidity index is in good agreement with DSq and CU test results, which preliminarily verifies the applicability of expression between s
u/σ
v0’ and I
L.
Quality and safety issues and countermeasures of major water conservancy projects in Zhejiang Province
Authors: Wang L , Xie Z K , Chen W L , Fu H W 
Published: June 2021

Abstract
Water conservancy project is an important public infrastructure project related to the national economy and people’s livelihood. The quality and safety issues of major water conservancy projects are the core work for the government to strengthen the management of water conservancy project construction. Based on the inspection and re-inspection work of major water conservancy projects in Zhejiang Province between 2015 and 2019, this paper analyzes the main problems existing in major water conservancy projects, points out the engineering quality and safety problems account for a large proportion, analyzes the changing trend of engineering quality and safety problems, points out the main causes of quality and safety problems as well as the causes of non-correction, and puts forward the corresponding solutions. On this basis, the main responsible parties and problems are analyzed, which provides reference and suggestions for the relevant participating units to strengthen the quality and safety management of major water conservancy projects in the future.
Wave Characteristics in Northeast Coastal Waters of Zhoushan Island Under the Influence of Winter Monsoon
Authors: Yang B , Xie H W , Ding J , Yang W K , Huan F , Ou J 
Published: June 2021

Abstract
Waves at 12 m water depth in the northeast coastal waters of Zhoushan Island were measured from November 2014 to February 2015, and the characteristics were described. The study showed that the significant wave height varied from 0.08 to 1.35 m with the average of 0.36 m during the winter monsoon period, but the maximum of the maximum wave height is close to the maximum value of some typhoon waves of the same place. The monthly main wave direction varied from ENE to N to NE to ENE. Relatively high correlations exist between some wave parameters and relationships between them were identified. Most of the waves have a bimodal spectrum and the influence of monsoon on waves is intermittent.
Research and prospect of post-peak strain-softening characteristics of rocks
Authors: Xu Guo-Ping , Liu Hong-Zhou , Fu Bai-Yong , Yu Jian-Gang 
Published: June 2021

Abstract
The current research status and development trends are summarized in order to analyze the strain softening deformation characteristics of post-peak of rocks, and the corresponding key problems are found, the key issues included the influence of strain softening on tunnel engineering and the research status of strain softening in hydraulic engineering. Based on the existing researches, it is found that there are few studies on the deformation characteristics of post-peak of rocks, and there is a lack of damage constitutive model which can better describe the post-peak mechanical properties. At present, it is impossible to simulate the influence of rock softening on stiffness degradation in indoor tests, and there is also a lack of on-site construction measured data as support; at the same time, the surrounding rock control and protection technology under loading and unloading also urgently needs to be improved; in addition, the interaction mechanism between water and structure during rock softening with water needs to be further explored.
Study on Key Technologies of Ecological Civilization of Lishui Ancient City Water System
Authors: Gong Mengyuan , Ye Zhou 
Published: June 2021

Abstract
Starting from the historical dimension, this paper studies the historical documents and engineering cases of ancient water conservancy projects in Lishui, explores the transformation law of urban water system in Lishui, and summarizes the key technologies of water ecology contained in ancient water control practice. It was found that Chuzhou took advantage of geographical, geological and climatic conditions, followed the overall balanced water control strategy, planned the ancient city water system network, and completed the task of water distribution. Among them, guided by planning technology, supplemented by canal system network, water and sediment regulation, flood control, interchange diversion and other technologies, a perfect water system is finally formed, which can provide reference for modern water conservancy projects construction.
The Safety Automatic Monitoring System of Ancient Seawall Based on Vibration Control
Authors: Wang Jianhua , Li Shuyi , Hu Zhichao 
Published: June 2021

AbstractWith the development of Chinese economy and society, infrastructure and engineering construction projects continue to increase. There are often construction projects such as wharfs, bridges and houses in the areas near the ancient seawall, which will affect the ancient seawall to a certain extent. Using IoT automated monitoring methods to realize the remote real-time monitoring and early warning of the ancient seawall of Qiantang River, and analyze the impact of vibration caused by the construction on the ancient seawall. In the mean time, safety automatic monitoring system of the ancient seawall based on vibration control was developed. The paper through the application of three experiment cases, analyze the impact of construction near the seawall, which has certain application value for the protection of the ancient seawall, daily operation management, and construction guidance of projects near seawalls.
Path analysis of water use efficiency in water diversion and irrigation areas in the lower Yellow River
Authors: Feng Feng , Zhang Fang , Zhao Ting , Jiang Nan , Wang Mengzhen , Feng Yuehua 
Published: June 2021

Abstract
The evaluation of water use efficiency is a comprehensive and continuous evaluation of irrigation water use efficiency in an irrigation district. The relationship between the main impact factors can effectively improve the accuracy and rationality of the results. Based on the data from 2005 to 2014 in the Yellow River irrigation area of the lower reaches of the Yellow River, this paper determined the direct effect, indirect effect, determination coefficient of the eight quantitative impact factors, as well as the difference of total contribution to R2, through the mathematical method of path analysis. Through the calculation data and analysis, it is found that the completion rate of supporting facilities is the most important influencing factor for the water use efficiency of the water diversion and irrigation areas in the lower Yellow River. The completion rate of supporting facilities also plays a role in the investment of water-saving projects, channel length and channel lining rate, which plays a significant role of water diversion and irrigation areas in the lower Yellow River. and the least influential factor is precipitation. The above studies have identified the existing problems and weak links in the process of water resources management in the Yellow River Diversion Irrigation Area, providing technical support for the scientific planning and sustainable development of the Yellow River Diversion Irrigation Area in the next step.
Study on construction technology of percussive reverse circulation drilling hole forming squeezed branch pile
Authors: Zeng Jun-Yan , Li Hai-Qin , Guan Wei-Dong , Zhu Wen-Tong 
Published: June 2021

Abstract
Taking No.65 pier of Zhongshan-Tanzhou express line as the background, the construction technology of percussive reverse circulation drilling hole forming squeezed branch pile is studied, the construction process of percussive reverse circulation drilling hole forming squeezed branch pile is defined, and through the field trial hole forming test, the points needing attention in field construction are summarized and improved: (1) The top elevation of the steel casing shall not exceed 30cm of the surface elevation, and the hole diameter of the percussion drilling hole shall be slightly larger than the designed hole diameter, so as to avoid the floating of the steel cylinder and the influence of too small hole diameter on the squeezing operation; (2) hole cleaning operation is an important factor for the success or failure of the squeezed branch pile construction, and the sediment thickness has a great influence on the bearing capacity of the pile foundation. After the expansion equipment is squeezed and the reinforcement cage is lowered, the hole cleaning is carried out, and the control points and mud parameters during each hole cleaning are clarified; (3) during the expansion process, the extrusion pressure value and the floating amount of the expansion equipment should be detailed, the geological information should be verified, and the bearing capacity of the pile foundation should be evaluated.
Study on Ultimate Seismic Capacity of Concrete Gravity Dam-Superhigh Face Rockfill Dam Compound Structure
Authors: Liu Jing , Zhou Heng , Lu Xi , Di Shengjie , Xing Ruijiao 
Published: June 2021

Abstract
Based on a very high for the project of the concrete face rockfill dam, by three-dimensional finite element analysis method, from the seismic permanent deformation, stress, deformation and stability of dam slope angle of joint panel, this paper demonstrates the ultimate seismic capacity of concrete gravity dam - superhigh face rockfill dam compound structure, the research results show that the dam seismic permanent deformation limit aseismic capacity from 0.65 g to 0.72 g, panel stress seismic limit of 0.7 g, joint dislocation of aseismic capacity limit is 0.8 g, dam slope stability of aseismic capacity limit is 0.43 g. The seismic ability of concrete gravity dam - superhigh face rockfill dam compound structure is strong and can meet the local fortification intensity requirements.