Article
Geosciences, Multidisciplinary
Martijn D. van Leer, Willem Jan Zaadnoordijk, Alraune Zech, Jasper Griffioen, Marc F. P. Bierkens
Summary: This study investigates whether a pumping test can be used to obtain the correlation lengths needed for geostatistical upscaling and account for the uncertainty about heterogeneous aquitard conductivity. The results show that random realizations generated from core-scale data yielded a better fit to the pumping test data than the traditional pumping test result, assuming homogeneous layers are selected. Ranges of horizontal and vertical correlation lengths that fit the pumping-test well are found, but considerable uncertainty remains.
HYDROGEOLOGY JOURNAL
(2023)
Article
Environmental Sciences
Xiaolan Hou, Rui Hu, Tian-Chyi Jim Yeh, Yukun Li, Junjie Qi, Yang Song, Huiyang Qiu
Summary: In this study, the random finite element method was used to investigate the cross correlations between observed head and hydraulic conductivity and specific storage in pumping tests. The results showed that the maximal cross correlations occurred before pumping reached steady state. A short-term pumping strategy using the successive linear estimator was proposed based on the cross-correlation analysis. Monte Carlo simulations were conducted to validate the strategy.
WATER RESOURCES RESEARCH
(2023)
Article
Construction & Building Technology
Horris K. Nangulama, Zhou Jian
Summary: This study presents two field cases of deep excavation using the hydraulic servo geotechnology as an enhancement to the lateral support. The results showed that the servo steel support geotechnology restrained above 70% of lateral displacements of the excavated walls, and ground surface influence zone settlements were kept within the acceptable warning limits. The numerical simulation of servo geotechnology deformation control capacity for deep excavation projects is validated, and this study provides a practical and significant reference on similar projects.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Agronomy
Hongyin Zhang, Jianlong Liu, Jinxin Wu, Weixuan Jiao, Li Cheng, Mingbin Yuan
Summary: This study optimizes the hydraulics of a bulb tubular pump unit using CFX 19.2 software. The findings suggest that the flow pattern at the tail of the elliptical bulb is better, with smaller hydraulic loss and higher device efficiency compared to a round tail. The streamlined support offers minimal flow resistance and hydraulic loss, leading to higher pump unit head and efficiency.
Article
Engineering, Geological
Junhong Huang, Xiaoqing Wei, Yi Luo, Hangli Gong, Tingting Liu, Xinping Li
Summary: This study investigated the deformation and failure of surrounding rock mass triggered by sudden changes of rock quality encountered in a tunnel excavation project, focusing on the geological disasters caused by fracture zones. The findings from a field case analysis of the Daliang Tunnel in China revealed the deformation profiles of the surrounding rock mass at different distances from the fracture zone. The relationship between the deformation of the surrounding rock mass in the fracture zone and the materials, length of advanced support, and excavation advance rate was also explored. The study emphasized the significance of controlling rock mass deformation in fracture zones.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Construction & Building Technology
Binbin Zhu, Peng Zhang, Mingfeng Lei, Lichuan Wang, Lun Gong, Chenjie Gong, Fudong Chen
Summary: This paper presents an improved analytical solution for predicting ground movements using ground loss correction. The solution is validated using field measurements and it is shown that in addition to grouting quality and timing, the vertical translation should also be strictly controlled to minimize ground deformation.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Thermodynamics
Yuqi Wang, Weixuan Jiao, Li Cheng, Heng Zhao, Yulan Zhu, Can Luo, Libo Dou
Summary: This paper studies the influence of shaft type in the shaft tubular pump on the flow characteristics and energy characteristics of the pump, and proposes optimization recommendations to reduce the entropy production dissipation of the pumping system.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2023)
Article
Mining & Mineral Processing
Manchao He, Qiru Sui, Mengnan Li, Zhijiao Wang, Zhigang Tao
Summary: In recent years, the mine tunneling method and the new Austrian tunneling method have been considered the main theories of tunneling approaches in China. The traditional technique faces difficulties in dealing with the large deformation problems caused by complex geological conditions in mountain soft rock tunneling. Therefore, the compensation excavation method has been proposed to address this issue by using supportive strategies to counteract the excavation effects.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Zhuangzhuang Guo, Daohong Qiu, Yuehao Yu, Yiguo Xue, Qiushi Liu, Weimeng Zhang, Zhiqiang Li
Summary: Due to the complexity of composite strata, traditional monitoring and measurement methods are not accurate in capturing the nonuniform deformation and local damage of tunnels. However, precise analysis and prediction of the nonuniform deformation in composite strata tunnels are crucial for related projects. In this study, a classification method for nonuniform deformation was established, and 135 numerical models were created for composite strata tunnels. A intelligent model called the least squares supports vector machine (PSO-LSSVM) was used to predict the nonuniform deformation during tunnel excavation. The results of the PSO-LSSVM were consistent with actual engineering data, providing targeted guidance for evaluating composite stratum tunnel engineering.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Construction & Building Technology
Xiaoxu Tian, Zhanping Song, Yuwei Zhang
Summary: This study analyzed the deformation characteristics of the lining and failure mode of the slope during the construction of the Xiamaixi tunnel. The effectiveness of reinforcement measures for controlling slope deformation was evaluated. It was found that a tunnel in a potential landslide area may experience extrusion deformation due to increasing external forces, rather than slipping.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Biodiversity Conservation
Debao Lu, Dongjing Huang, Cundong Xu
Summary: A novel method combining ERT with pumping test data was proposed to obtain the spatial distribution of hydraulic conductivity for metamorphic rock and granite fault zone in Xinchang, China. The results showed that the hydraulic conductivity calculated using the R-K correlation had an error of less than 10.50% compared to that measured by pumping tests, indicating superior accuracy of the proposed method.
ECOLOGICAL INDICATORS
(2021)
Article
Energy & Fuels
Yusuke Ozaki, Eiichi Ishii, Kentaro Sugawara
Summary: This study analyzed long-term hydraulic pressure data to estimate the variation of effective hydraulic conductivity and explored the nature of the variation of fault hydraulic connectivity with depth around the predicted boundary. The results suggest that the hydraulic connectivity of faults does not change abruptly, but instead varies gradually over several tens of meters around the domain boundary.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Chemistry, Multidisciplinary
Manli Qu, Faning Dang
Summary: High slope simulation analysis is crucial for slope engineering design, construction, and operation management. This paper establishes a refined finite element model and carries out fluid-solid coupling numerical simulation analysis to explain the failure mechanism of slopes under excavation unloading and heavy rainfall.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Nianwu Liu, Jingjie Pan, Mingguang Li, Ying Li
Summary: A comprehensive instrumentation program was conducted to analyze the deformation characteristics of an ultra-deep and small-scale rectangular excavation in Hangzhou soft clay. Field data analysis showed that the maximum wall deformation and ground settlement were less than 0.2% and 0.04% of the excavation depth, respectively, indicating the significant spatial effect of the excavation. The location of the maximum wall deformation in the ultra-deep excavation was influenced by both the excavation depth and stratum distribution. The construction of diaphragm walls and soil improvement prior to excavation resulted in significant building settlements, accounting for 30%-50% of the total settlements.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Environmental Studies
Kai Liu, Wenjue Zhu, Mingzhong Luo
Summary: The land integration and titling policy (LITP) has significant economic implications for implementing a top-down land titling policy (LTP). However, land heterogeneity and fragmentation pose constraints on the LITP. Empirical analysis using survey data from Guangdong province in 2017 reveals that geological fertility, irrigation facilities, and farmland rent heterogeneity have a negative effect on the implementation of the LITP. The presence of cultivation machine roads and irrigation facilities promotes the LITP while mitigating the inhibiting effect of land fragmentation.
