Study on Technique of Automatic and Continuous Monitoring Groundwater Level and its Application to Engineering

2012 ◽  
Vol 170-173 ◽  
pp. 2060-2065
Author(s):  
Chun Bao Xiong ◽  
Hai Tao Wang
Keyword(s):  
Groundwater Level ◽  
Continuous Monitoring ◽  
Serial Communication ◽  
Water Pressure ◽  
Pumping Test ◽  
Underground Engineering ◽  
Engineering Project ◽  
Engineering Construction ◽  
Level Change ◽  
Java Language

Pumping test is a common method to obtain the hydrogeology information for underground engineering construction, of which monitoring groundwater level is an important part. A system of automatic and continuous monitoring groundwater level was developed to meet the special requirements of pumping test. Considering the characteristics of groundwater level change in pumping test, the sensor of water pressure based on vibration string was used. For connecting the sensor and computer, serial communication protocols were programmed in JAVA language. The system was applied to an engineering project, and it achieved the satisfactory effects.

scholarly journals The Relationship between Surface Displacement and Groundwater Level Change and Its Hydrogeological Implications in an Alluvial Fan: Case Study of the Choshui River, Taiwan

2020 ◽  
Vol 12 (20) ◽  
pp. 3315
Author(s):  
Chiao-Yin Lu ◽  
Jyr-Ching Hu ◽  
Yu-Chang Chan ◽  
Yuan-Fong Su ◽  
Chih-Hsin Chang
Keyword(s):  
Groundwater Level ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Groundwater Resources ◽  
Surface Displacement ◽  
Vertical Surface ◽  
Alluvial Fan ◽  
Level Change ◽  
The Relationship ◽  
Groundwater Level Change

Balancing the demand of groundwater resources and the mitigation of land subsidence is particularly important, yet challenging, in populated alluvial fan areas. In this study, we combine multiple monitoring data derived from Multi-Temporal InSAR (MTI), GNSS (Global Navigation Satellite System), precise leveling, groundwater level, and compaction monitoring wells, in order to analyze the relationship between surface displacement and groundwater level change within the alluvial fan of the Choshui River in Taiwan. Our combined time-series analyses suggest, in a yearly time scale, that groundwater level increases with the vertical surface displacement when the effect of pore water pressure dominates. Conversely, this relationship is negative when the effect of water-mass loading predominates over pore water pressure. However, the correlation between the vertical surface displacement and the groundwater level change is consistently positive over the time scale of two decades. It is interpreted that the alluvial fan sequence in the subsurface is not fully elastic, and compaction is greater than rebound in this process. These findings were not well reported and discussed by previous studies because of insufficient monitoring data and analyses. Understanding the combined effect of groundwater level change and vertical surface displacement is very helpful for management of land subsidence and usage of groundwater resources. The spatial and temporal integration of multi-sensors can be applied to overcome the limitations associated with the single technique and provides further insights into land surface changes, particularly in highly populated alluvial fan areas.

Research on Simulation of Land Subsidence Characteristics under the Groundwater Level Fluctuation

2013 ◽  
Vol 368-370 ◽  
pp. 1697-1700
Author(s):  
Long Zhang ◽  
Xue Wen Lei ◽  
Qing Shang Meng
Keyword(s):  
Finite Element ◽  
Land Subsidence ◽  
Groundwater Level ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Soft Clay ◽  
Level Fluctuation ◽  
Finite Element Software ◽  
Coastal Cities ◽  
Groundwater Level Fluctuation

Based on the characteristics of frequent land subsidence events caused by groundwater level fluctuation in coastal cities in China and studying on the quaternary sedimentary soft clay in Shanghai, the effects of groundwater level fluctuation on the deformation of soft clay is simulated by Geo-Studio finite element software. It has summarized the law of deformation, effective stress with the change of groundwater level fluctuation, especially the process of dissipation of pore water pressure with the groundwater level fluctuation. The low can be sued as a reference for similar engineering and land subsidence prevention.

scholarly journals A Method and Equipment for Continuously Testing the Permeability Coefficient of Rock and Soil Layers

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Wei Chen ◽  
Datian Cui ◽  
Meng Xu ◽  
Rongchao Xu
Keyword(s):  
Flow Rate ◽  
Test Section ◽  
Permeability Coefficient ◽  
Water Pressure ◽  
Pumping Test ◽  
Testing Method ◽  
Water Pressure Test ◽  
Pressure Test ◽  
Test Hole ◽  
Rock And Soil

The water pressure test and steady-flow pumping test are still commonly used for measuring the permeability coefficient of rock and soil strata. Limited by the fact that the average value of the permeability coefficient could be obtained only by this testing method, the accuracy of the experimental results of the permeability coefficient for special rock and soil strata is not good. Therefore, a new on-site testing method and equipment for continuously measuring the permeability coefficient of rock and soil strata is studied in this paper. The method is suitable for water pressure testing in borehole and the steady-flow pumping test. The technical proposal is when the pumping test or water pressure test is carried out, the final water penetration will tend to be a stable value, and then, the high-precision current meter probe will be placed at the bottom of the pumping test hole or water pressure test hole. For the pumping test, the current meter will be lifted uniformly from the bottom of the borehole testing section to the stable water level. Meanwhile, the flow rate of a differential zone of the tested section is continuously detected. For the water pressure test, the current meter will be lifted uniformly from the bottom of the borehole test section to the top of the borehole test section, and the flow rate of the differential section will be continuously detected. Through data analysis and processing, not only the average permeability coefficient of the detected sections can be obtained but also the permeability coefficient of the differential section of the rock and soil stratum can be calculated, respectively. Furthermore, the corresponding relationship between the permeability coefficient and the detected location can be obtained. In view of the abovementioned reasons, the leaking point, the specific position, and the leakage quantity of the detected section could be found out accurately, which will improve the accuracy of the testing results obviously.

scholarly journals Automatic Monitoring System in Underground Engineering Construction: Review and Prospect

2020 ◽  
Vol 2020 ◽  
pp. 1-16 ◽  
Author(s):  
Lixin Wang ◽  
Shuoshuo Xu ◽  
Junling Qiu ◽  
Ke Wang ◽  
Enlin Ma ◽  
...  
Keyword(s):  
Monitoring System ◽  
New Technology ◽  
Automatic Monitoring ◽  
Future Research ◽  
Underground Engineering ◽  
Automatic Monitoring System ◽  
Engineering Construction ◽  
Intelligent Technology ◽  
Time Acquisition ◽  
Engineering Monitoring

Automatic monitoring system is one of the main means to ensure the safety of underground engineering construction. This paper summarizes the current international research and application status of the underground engineering monitoring system from three aspects of data acquisition, data transmission, and data processing and emphatically introduces the mainstream new technology of the monitoring system. Furthermore, this paper puts forward specific and implementable technical routes based on the current intelligent technology and the challenges faced by future monitoring, which can provide direction and reference for future research, including high-precision real-time acquisition and safe and reliable transmission of monitoring data, multisource data fusion, and the visual intelligent early warning platform.

scholarly journals An Experimental and Numerical Investigation on the Initiation and Interaction of Double Cracks in Rocks under Hydromechanical Coupling

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Jie Mei ◽  
Wanzhi Zhang
Keyword(s):  
Water Pressure ◽  
Critical Length ◽  
Maximum Energy ◽  
Enhancement Effect ◽  
Hydromechanical Coupling ◽  
Underground Engineering ◽  
Side Rock ◽  
Crack Tips ◽  
Dip Angle ◽  
Interaction Behaviors

The growth of double cracks is the main factor leading to progressive rock failure under hydromechanical coupling. The initiation modes and interaction behaviors of double cracks were investigated by using laboratory tests, and the influences of water pressure were analyzed. The maximum energy release rate criterion was modified to determine the crack growth characteristics. A numerical model was established and then verified by the test results. Based on the simulation, the distribution of stress fields and key fracture parameters of double cracks was investigated. Then, initiation characteristics and interaction behaviors of parallel and nonparallel cracks were quantitatively analyzed. The results indicate that the increase in water pressure leads to the crack initiation being inclined to the original surfaces and the growth length along the crack fronts tending to be uniform; the small tensile stress zones are formed close to the crack tips, and significant compressive stress zones are formed at both sides of the crack surfaces; stress superposition and interaction occur when crack spacing is less than 2.5a; the interactive weakening effect is mainly present in the inner side (rock bridge zone) of cracks, while a certain degree of interactive enhancement effect exhibits in the outer sides; the cracks are much easier to initiate at the outer wing cracks when the spacing is less than the critical length (0.5a); and cracks with a dip angle of 45° are much easier to initiate at the endpoints of long axis. The research results provide certain theoretical guidance for the safety assessment of underground engineering.

Plugging Performance Optimization Tests of Grouting Material for Sudden Water Inflow of Underground Engineering Construction

2011 ◽  
Vol 306-307 ◽  
pp. 722-726 ◽  
Author(s):  
Li Ping Li ◽  
Shu Cai Li ◽  
Jin Sheng Cui ◽  
Zhao Li
Keyword(s):  
Performance Optimization ◽  
Water Pressure ◽  
High Water ◽  
Water Inflow ◽  
Karst Area ◽  
Seepage Water ◽  
Underground Engineering ◽  
Grouting Material ◽  
New Type ◽  
Plugging Performance

Sudden water inflow is the typical geological hazard during the construction period of underground, especially for the karst area. According to a new type of polymer chemical grout material called Malisan, plugging performance optimization tests of different grouting material had been carried out, such as ordinary cement, superfine cement and special cement of HSC, the geo time, consolidating strength, anti-erosion property and comprehensive properties of grouting harnessing had been systematically analyzed and compared. Test results showed that the new type of polymer chemical grout material has the significant characteristics of controllable gel time, high consolidating strength, anti-scour performance, water swelling and extremely strong permeability, it is more effective than conventional grouting material for grouting harnessing of seepage, water spraying and water inflow with high water pressure, in addition, it is convenient for transportation, material configuration and process operation.

Study on the Information Processing Technology of Deformation Monitoring Data in the Underground Engineering

2013 ◽  
Vol 353-356 ◽  
pp. 1555-1558
Author(s):  
Ke Wu ◽  
Ke Zhang ◽  
Cheng Jun Wang ◽  
Chuang Zhao
Keyword(s):  
Data Processing ◽  
Measurement Data ◽  
Processing System ◽  
Deformation Monitoring ◽  
Surrounding Rock ◽  
Monitoring Data ◽  
Dynamic Monitoring ◽  
Information Control ◽  
Underground Engineering ◽  
Engineering Construction

The deformation monitoring of surrounding rock and data processing in tunnel is the foundation and safety technical support of underground engineering information control and management. However, due to the special environment in the underground engineering construction, acquiring the deformation information of surrounding rock accurately and fast to assess the stability of surrounding rock is becoming one of the bottleneck problems for underground construction project information to be solved. According to the underground engineering projects, Based on the dynamic monitoring data processing and analysis, a set of underground engineering construction monitoring measurement data processing system is established, which can meet the acquisition of the monitoring measurement data, the arrangement of the measured data, data analysis and feedback, the monitoring data regression analysis.

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