Water Inflow Quantity Evaluation and Prediction for Cimushan Tunnel

2012 ◽  
Vol 594-597 ◽  
pp. 1269-1274
Author(s):  
Xiao Guang Jin ◽  
Yu Juan Jin ◽  
Hao Feng Tang
Keyword(s):  
Numerical Modeling ◽  
Water Cycle ◽  
Dynamic Balance ◽  
Construction Safety ◽  
Water Inflow ◽  
Test Results ◽  
Tunnel Excavation ◽  
Groundwater System ◽  
Construction Period ◽  
Treatment Measures

Tunnel excavation breaks the original hydrological dynamic balance, promotes water cycle and influences the mountain groundwater system to some extent. Water inflow during construction not only threatens construction safety, but also affects surface vegetation’s growth. Taking tunnel 1 in Chongqing Cimushan area as the project background, and through analyzing the hydrological test results from tunnel exploration stage, counting the actual water inflow quantity in construction period, doing the 3-D finite element numerical modeling, we analyzed and evaluated the tunnel water inflow quantity, to provide reference for recognizing the harm of groundwater and making treatment measures.

Research of Water Inflow Impact on Ecological Environment for Cimushan Tunnel

2012 ◽  
Vol 594-597 ◽  
pp. 1263-1268
Author(s):  
Xiao Guang Jin ◽  
Hong Wei Liu ◽  
Shi Xiang Zhou
Keyword(s):  
Groundwater Level ◽  
Water Cycle ◽  
Dynamic Balance ◽  
Salt Content ◽  
Water Inflow ◽  
Ecological Environment ◽  
Local Conditions ◽  
Aquifer System ◽  
Groundwater Aquifer ◽  
Geological Conditions

Tunnel excavating breaks the original hydrological dynamic balance, promotes water cycle and interchange, the influences extent to groundwater flow system and groundwater level by tunnel discharge has direct connection with structure of groundwater aquifer system. The factors which impact ecological environment including the depth of groundwater, groundwater mineralized degree, suspended moisture content and salt content etc., of which, Groundwater level is very important to the survival of vegetation. Analyzing tunnel’s water inflow and the change of seepage field impact the groundwater level, the change of surface water and groundwater quality and the ecological environment influence of nearby tunnel. Studying the water inflow of tunnel impact on the tunnel site, which provide a reference of correct implementation of the tunnel construction principles “prevention, drainage, cut, plug union, adaptation to local conditions, and comprehensive management of water” when build tunnel in similar geological conditions of landscape areas.

scholarly journals Experimental Study on Mechanical Performance of U-Shaped Steel-Encased Concrete Composite Beam-Girder Joints

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Zhangqi Hu ◽  
Ran He ◽  
Yukui Wang ◽  
Weirong Lv ◽  
Jingchao Li
Keyword(s):  
Composite Beam ◽  
Mechanical Performance ◽  
Concrete Slab ◽  
Bottom Flange ◽  
The Novel ◽  
Test Results ◽  
Construction Period ◽  
Failure Patterns ◽  
Loading Tests ◽  
Two Sides

This paper proposes a novel U-shaped steel-encased concrete composite beam-girder joint (referred to herein as the novel composite beam-girder joint), in which the U-shaped beams at two sides (L and R) are inserted into a shaped sleeve, and the U-shaped girder and two U-shaped beams are connected by the shaped sleeve through welding. Compared with the traditional beam-girder joints, the novel composite beam-girder joints take advantage of easy construction, light weight, and short construction period. The failure patterns, load-strain and load-deflection curves, and strain distributions of the novel composite beam-girder joints were investigated through the static loading tests on two full-scale specimens, denoted as GBJ1 and GBJ2. The two specimens were varied in beam section reinforcements. Specimen GBJ2 was equipped with 3Ф16 additional bars in the U-shaped beams based on Specimen GBJ1. Test results show that the two specimens failed as the through arc cracks developed at the concrete slab interfaces. The additional bars can increase the bearing capacity slightly but will also increase the stress concentration on the bottom flange of the shaped sleeve, leading to the decrease of ductility for Specimen GBJ2. The slab effect is considered in the test and can thus reflect the actual stress state of the beam-girder joints well. This study can provide a reference for the design and application of beam-girder joints.

scholarly journals Assessing the long-term sustainability of the groundwater resources in the Bacchiglione basin (Veneto, Italy) with the Mann–Kendall test: suggestions for higher reliability

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Mara Meggiorin ◽  
Giulia Passadore ◽  
Silvia Bertoldo ◽  
Andrea Sottani ◽  
Andrea Rinaldo
Keyword(s):  
Groundwater Level ◽  
Water Cycle ◽  
Groundwater Resources ◽  
Sustainable Use ◽  
Kendall Test ◽  
Groundwater System ◽  
Aquifer System ◽  
Mann Kendall Test ◽  
Status Assessment

The social, economic, and ecological importance of the aquifer system within the Bacchiglione basin (Veneto, IT) is noteworthy, and there is considerable disagreement among previous studies over its sustainable use. Investigating the long-term quantitative sustainability of the groundwater system, this study presents a statistical methodology that can be applied to similar cases. Using a combination of robust and widely used techniques, we apply the seasonal Mann–Kendall test and the Sen’s slope estimator to the recorded groundwater level timeseries. The analysis is carried out on a large and heterogeneous proprietary dataset gathering hourly groundwater level timeseries at 79 control points, acquired during the period 2005–2019. The test identifies significant decreasing trends for most of the available records, unlike previous studies on the quantitative status of the same resource which covered the domain investigated here for a slightly different period: 2000–2014. The present study questions the reason for such diverging results by focusing on the method’s accuracy. After carrying out a Fourier analysis on the longest available timeseries, for studies of groundwater status assessment this work suggests applying the Mann–Kendall test to timeseries longer than 20 years (because otherwise the analysis would be affected by interannual periodicities of the water cycle). A further analysis of two 60-year-long monthly timeseries between 1960 and 2020 supports the actual sustainable use of the groundwater resource, the past deployment of the groundwater resources notwithstanding. Results thus prove more reliable, and meaningful inferences on the longterm sustainability of the groundwater system are possible.

scholarly journals Evaluation of the Influence Caused by Tunnel Construction on Groundwater Environment: A Case Study of Tongluoshan Tunnel, China

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Jian Liu ◽  
Dan Liu ◽  
Kai Song
Keyword(s):  
Indicator System ◽  
Field Investigation ◽  
Assessment Method ◽  
Tunnel Construction ◽  
Moderate Degree ◽  
Tunnel Excavation ◽  
Construction Period ◽  
Environmental Investigation ◽  
Groundwater Environment

Problems related to water inflow during tunnel construction are challenging to designers, workers, and management departments, as they can threaten tunneling project from safety, time, and economic aspects. Identifying the impacts on groundwater environment resulting from tunnel drainage and making a correct assessment before tunnel construction is essential to better understand troubles that would be encountered during tunnel excavation and helpful to adopt appropriate countermeasures to minimize the influences. This study presents an indicator system and quantifies each indicator of Tongluoshan tunnel, which is located in southwest China with a length of 5.2 km and mainly passes through carbonate rocks and sandstones, based on field investigation and related technological reports. Then, an evaluation is made using fuzzy comprehensive assessment method, with a result showing that it had influenced the local groundwater environment at a moderate degree. Information fed back from environmental investigation and hydrologic monitoring carried out during the main construction period proves the evaluation, as the flow of some springs and streams located beside the tunnel route was found experiencing an apparent decline.

scholarly journals Coronavirus Disease 19 Infection Does Not Result in Acute Kidney Injury: An Analysis of 116 Hospitalized Patients from Wuhan, China

2020 ◽  
Vol 51 (5) ◽  
pp. 343-348 ◽  
Author(s):  
Luwen Wang ◽  
Xun Li ◽  
Hui Chen ◽  
Shaonan Yan ◽  
Dong Li ◽  
...  
Keyword(s):  
Acute Kidney Injury ◽  
Renal Function ◽  
Demographic Data ◽  
Pulmonary Inflammation ◽  
Stable State ◽  
Kidney Injury ◽  
Test Results ◽  
Reading Frame ◽  
Laboratory Test Results ◽  
Treatment Measures

Background: Whether the patients with coronavirus disease 19 (COVID-19) infected by severe acute respiratory syndrome (SARS)-CoV-2 would commonly develop acute kidney injury (AKI) is an important issue worthy of clinical attention. This study aimed to explore the effects of SARS-CoV-2 infection on renal function through analyzing the clinical data of 116 hospitalized COVID-19-confirmed patients. Methods: One hundred sixteen COVID-19-confirmed patients enrolled in this study were hospitalized in the Department of Infectious Diseases, Renmin Hospital of Wuhan University from January 14 to February 13, 2020. The recorded information includes demographic data, medical history, contact history, potential comorbidities, symptoms, signs, laboratory test results, chest computer tomography scans, and treatment measures. SARS-CoV-2 RNA in 53 urine sediments of enrolled patients was detected by real-time reverse transcription-polymerase chain reaction. Results: Twelve (10.8%) patients showed mild increase of blood urea nitrogen or creatinine (<26 μmol/L within 48 h), and 8 (7.2%) patients showed trace or 1+ albuminuria in 111 COVID-19-confirmed patients without chronic kidney disease (CKD). All these patients did not meet the diagnostic criteria of AKI. In addition, 5 patients with CKD who were undergone regular continuous renal replacement therapy (CRRT) before admission were confirmed infection of SARS-CoV-2 and diagnosed as COVID-19. In addition to therapy for COVID-19, CRRT was also applied 3 times weekly during hospitalization for these 5 patients with CKD. In the course of treatment, the renal function indicators showed stable state in all 5 patients with CKD, without exacerbation of CKD, and pulmonary inflammation was gradually absorbed. All 5 patients with CKD were survived. Moreover, SARS-CoV-2 RNA in urine sediments was positive only in 3 patients from 48 cases without CKD, and 1 patient had a positive for SARS-CoV-2 open reading frame 1ab from 5 cases with CKD. Conclusion: AKI was uncommon in COVID-19. SARS-CoV-2 infection does not result in AKI, or aggravate CKD in the COVID-19 patients.

Coupling Real-Time Control of Construction Safety and Progress of Roller Compacted Concrete Dam during the Construction Period

2013 ◽  
Vol 368-370 ◽  
pp. 1454-1458
Author(s):  
Hao Tian Chang ◽  
Deng Hua Zhong
Keyword(s):  
High Standard ◽  
Construction Safety ◽  
Construction Simulation ◽  
Real Time Control ◽  
Construction Period ◽  
Progress Control ◽  
Roller Compacted Concrete ◽  
Time Control ◽  
Rcc Dam ◽  
Roller Compacted Concrete Dam

During the construction period of roller compacted concrete (RCC) dam, the scientific control of safety and progress is very important. It can provide guarantee for realizing the high-standard, high-intensity, continuous and rapid construction. First, through analyzing the coupling relationship between construction safety and progress, the procedure of progress control coupling safety analysis was proposed. Second, a mathematical model for coupling control of construction safety and progress that considers complex constraints was developed. Third, a construction simulation system considering safety factors was developed. Finally, these methods were applied to a practical project, and can provide new theoretical principles and technical support for safety and progress control in the RCC dam construction process.

Study on the Numerical Modeling of the SRHPC Frame

2010 ◽  
Vol 163-167 ◽  
pp. 1561-1564
Author(s):  
Pi Ji Hou ◽  
Shan Suo Zheng ◽  
Lei Li
Keyword(s):  
Finite Element ◽  
Numerical Modeling ◽  
High Performance ◽  
Applied Load ◽  
Mechanical Characteristics ◽  
High Performance Concrete ◽  
Frame Structure ◽  
Test Results ◽  
Modeling Methodology

The modeling methodology is investigated for steel reinforced high performance concrete (SRHPC) in this paper. According to the mechanical characteristics of the SRHPC members, the structural section can be divided into different zones, and the element suitable for each zone is determined. Some discussion is made for how to control finite element gridding as well as applied load. Hysteretic loops of the computation results and test results agree well with each other, indicating the accuracy and applicability of the methodology. This research may be helpful for the nonlinear finite analysis of the SRHPC frame structure.

Model Parameter Identification of Tire Dynamic Balance Detection System

2012 ◽  
Vol 157-158 ◽  
pp. 731-736
Author(s):  
Jing Fang Yang ◽  
Xian Ying Feng ◽  
Hong Jun Fu ◽  
Shi Gang Mu
Keyword(s):  
Parameter Identification ◽  
Detection System ◽  
Dynamic Balance ◽  
Signal Amplitude ◽  
Engineering Practice ◽  
Model Parameters ◽  
Test Results ◽  
Process Data ◽  
Validation Experiment ◽  
The Right

Tire dynamic balance detection plays an important part in tire quality detection area. An accurate model structure and precise model parameters are the basis of the right test results. This paper builds a kinetic model based on engineering practice. To acquire parameters presents a method following identification theory. According to the need of actual production, a validation experiment is put forward. In the parameter identification process, data acquisition is completed by the PCI card. For data processing, this paper designs the fitting filter and then it also fetches the signal amplitude and phase with discrete Fourier transform. The results are proven to be right and practicable.

Sign in / Sign up

Export Citation Format

Share Document