Groundwater Seepage Rule Simulation of Horse River Based on MIDAS/GTS

2012 ◽  
Vol 170-173 ◽  
pp. 3715-3719
Author(s):  
Bo Liu ◽  
Yong Tao Gao ◽  
Ai Bing Jin ◽  
Fu Gen Deng ◽  
Min Zhe Zhang
Keyword(s):  
Pore Water Pressure ◽  
Water Pressure ◽  
Dynamic Change ◽  
Element Model ◽  
Seepage Water ◽  
Reinforcement Scheme ◽  
Groundwater Seepage ◽  
Water Head ◽  
Total Head ◽  
Seepage Law

In order to understand more clearly the law of groundwater seepage, recharge, excretion and dynamic change of groundwater level in the Horse River of Xishimen Iron Mine, it makes full use of MIDAS/GTS to build seepage model of settlement zone in Horse River, and by the analysis of changes of total head and the pore water pressure of the model ,we can study Horse River seepage law in the influence of mining , and track and survey the actual project. The results show that, the finite element model with the actual engineering seepage water head, pore pressure are compared, so as to provide the basis for the selection of Horse River seepage reinforcement scheme.

scholarly journals Numerical Simulation on the Whole Sinking Process of Open Caisson with an Improved SPH Method

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Jiahe Zhang
Keyword(s):  
Pore Water Pressure ◽  
Water Pressure ◽  
Dynamic Change ◽  
Soil Pressure ◽  
Shield Tunneling ◽  
Material Interfaces ◽  
Engineering Problems ◽  
Domain Truncation ◽  
Particle Hydrodynamics ◽  
Sph Simulation

The phenomena of dynamic change in the material interfaces and mechanical properties are often involved in the caisson construction. Using conventional methods to simulate these phenomena is quite difficult due to the extremely large deformation. In this study, we proposed an improved soil-water-caisson interaction algorithm with the method of smoothed-particle hydrodynamics (SPH). This algorithm dealt with the support domain truncation of the particles near the blade and applied δ − SPH to avoid the pressure fluctuation. Meanwhile, the application of dynamic particles birth and death method could simulate the whole sinking process of an open caisson with underwater soil excavation. According to the comparison between SPH simulation and centrifuge test, the distribution of sidewall effective soil pressure was consistent, which indicated promising applicability of the algorithm. It should be noted that the considerable excess pore water pressure appeared in the surrounding soil under the blade. With the dissipation of the pressure over time, the effective soil stress increased correspondingly, and it would lead to the increasing difficulty of the sinking process. Therefore, the caisson should be avoided to stop for a long time during the sinking process or it would cause the stagnation of sinking. This algorithm could simulate engineering problems involving underwater construction effectively and provide theoretical and technical support for underwater excavation, shield tunneling, and other engineering problems.

scholarly journals Experimental Study on the Failure Mechanism of Tunnel Surrounding Rock under Different Groundwater Seepage Paths

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Yingchao Wang ◽  
Yang Liu ◽  
Yongliang Li ◽  
Wen Jiang ◽  
Yueming Wang
Keyword(s):  
Failure Mechanism ◽  
Water Flow ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Water Flow Rate ◽  
Surrounding Rock ◽  
Tunnel Engineering ◽  
Measuring Point ◽  
Groundwater Seepage

The influence of groundwater on tunnel engineering is very complicated. Due to the complexity of water flow water pressure transfer and uncertain defects in the stratum, all of which are key factors with regard to the design of tunnel engineering. Therefore, the variation of surrounding rock during excavation and the deformation and failure of soft surrounding rock under different seepage paths of underground water after excavation systematically. Experimental results showed that the stress change of surrounding rock caused by tunnel excavation can be divided into 3 stages: stress redistribution, stress adjustment, and stress rebalancing. In the process of water pressure loading, water flow rate is closely related to the experimental phenomenon. The between stable loading water pressure pore water pressure of the tunnel surrounding rock and the distance from the measuring point to the edge of the tunnel obey the exponential function of the decreasing growth gradient. With the increase of loading pressure, the pore water pressure and stress at the top of the tunnel increase, and the coupling of stress field and seepage field on both sides of surrounding rock more and more intense. The failure process of the tunnel can be divided into 6 stages according to the damage degree. The final failure pattern of the surrounding rock of the tunnel is mainly determined by the disturbed area of excavation. The arched failure area and the collapse-through failure area are composed of three regions. The surrounding rock is characterized by a dynamic pressure arch in the process of seepage failure, but it is more prone to collapse failure at low water pressure. The results of this study are the progressive failure mechanism of tunnel under different groundwater seepage paths and would be of great significance to the prevention of long-range disasters.

scholarly journals An analytical solution for steady seepage into a defective pipe

2017 ◽  
Vol 18 (3) ◽  
pp. 926-935 ◽  
Author(s):  
Yao Tang ◽  
Dave H. Chan ◽  
David Z. Zhu ◽  
Shuai Guo
Keyword(s):  
Analytical Solution ◽  
Groundwater Flow ◽  
Pressure Distribution ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Water Flow Rate ◽  
Infiltration Rate ◽  
Defect Position ◽  
Water Head ◽  
Parametric Studies

Abstract An analytical solution was proposed for the groundwater flow through a defective pipe, which can be used to estimate the water flow rate into the pipe and predict the pore water pressure distribution in surrounding soils. This analytical solution was verified by comparing with experimental results, and the predicted pressure distribution around the defective pipe is proved to be consistent with numerical simulations using the finite element method. From the parametric analysis, the infiltration rate increases as the defect position changes from top to bottom on the pipe, and the effect of defect position is not significant if the water head above the defect is 10 times greater than pipe radius. An approximated solution for estimating the groundwater flow infiltration rate through a circular orifice on the pipe is proposed as well. From the verification and parametric studies, this proposed analytical solution is proved to be an efficient approach for the estimation of groundwater infiltration through a defective pipe.

3-D FEM Seepage Simulation of Channel with Drain Pipes

2011 ◽  
Vol 137 ◽  
pp. 198-204
Author(s):  
Zong Kun Li ◽  
Yu Rong Huang ◽  
Jian You Wang ◽  
Qiang Zi
Keyword(s):  
Permeability Coefficient ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Water Transfer ◽  
Middle Line ◽  
Common Elements ◽  
High Permeability ◽  
Water Head ◽  
Inner Surface ◽  
North Water

In order to simulate the seepage field with drain pipes, the air element method is used in this paper. In this method, the pipe elements are regarded as a kind of material with high permeability coefficient and an equivalent hydraulic conductivity is assigned to them. Thus these pipe elements can be included in the conventional seepage calculation as other common elements. Moreover, the difficulty of giving water head boundary to the inner surface of pipes directly is avoided. According to the seepage calculation of the channel with large number of drain pipes in Huangyou part of the middle line in South-to-North water transfer project, the results show that, with drainage-piping, the pore water pressure in channel foundation is reduced significantly.

Numerical Analysis of Grouting and Blocking of Deep Large Section Shaft at Working Face

2012 ◽  
Vol 157-158 ◽  
pp. 865-869
Author(s):  
Ji Ming Zhu ◽  
Wen Quan Zhang ◽  
Hai Ling Yu ◽  
Xiang Lan Liu
Keyword(s):  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Water Channel ◽  
Seepage Flow ◽  
Water Inflow ◽  
Seepage Water ◽  
Large Section ◽  
Working Face ◽  
Water Block

To estimate the effect of deep large section Shaft Face Grouting for water block, the mathematical model is obtained according to the seepage theory. The numerical model for calculation is established by the program ABAQUS. The laws of change of pore water pressure, the effect area of dewatering, the velocity of seepage, water inflow of shaft working face before and after grouting is obtained by numerical simulation. It is shown that the grouting can effectively plug water channel of cracked surrounding rock, and prevent the pore water pressure lowering range to be larger. The working face seepage flow velocity was significantly reduced. The water inflow is decreased significantly. The safety of the shaft construction and the stability structure of shaft lining and upper strata are ensured by grouting. The numbers of grout stop and grouting construction can be largely reduced. The economic benefit is obvious. The scientific reference is provided for deep large section Shaft Face Grouting for water block.

Analysis on Surface Displacement Caused by Groundwater Seepage of Shield-Tunneling

2012 ◽  
Vol 170-173 ◽  
pp. 1740-1743
Author(s):  
Hai Xia Sun ◽  
Hai Jun Sang ◽  
Hai Yu Wu
Keyword(s):  
Pore Water Pressure ◽  
Water Pressure ◽  
Surface Displacement ◽  
Tunnel Engineering ◽  
Shield Tunneling ◽  
Seepage Field ◽  
Simulation Data ◽  
Groundwater Seepage ◽  
Set Up ◽  
Pressure Changes

Seepage is one of the unfavorable factors inducing construction accident. It is essential to analyze the influence to the displacement from seepage by the variety of the parameter of seepage. Set up simulation model by software Abaqus. This text studied the law on the displacement of groundwater during construction considering the influence of groundwater seepage, and contrasted the simulation data with groundwater and without groundwater. The pore water pressure changes because of the influence to seepage field from excavation. the displacement curves head for the same on different porosity. The settlement increase and the swell decrease with the addition of porosity. It is obvious that the displacement with groundwater is lager than without groundwater. A suggestion is made that the tunnel engineering should be designed with considering the influence of groundwater.

Numerical Simulation of Post-Construction Deformation Characteristics of Storage Oil Tank Ground

2013 ◽  
Vol 353-356 ◽  
pp. 593-596 ◽  
Author(s):  
Yan Mei Zhang ◽  
Xu Dong Zhang
Keyword(s):  
Permeability Coefficient ◽  
Pore Water Pressure ◽  
Ground Deformation ◽  
Water Pressure ◽  
Three Dimensional ◽  
Element Model ◽  
Additional Stress ◽  
Soil Parameters ◽  
Ground Settlement ◽  
Constrained Modulus

Ground soil was looked as porous medium, a three-dimensional finite element model of shell-liquid-foundation-ground was built, and the influence of soil parameters, filling liquid mode, and liquid height on the tank ground deformation was discussed. The research shows that the subsidence range caused by additional stress is the 0.3D range of the tank bottom edge outer; the influence of soil constrained modulus on settlement is remarkable, with constrained modulus decreasing, the tank ground settlement increases; with soil permeability coefficient decreasing, the tank ground settlement decreases; the ground settlement curve shape is decided by soil constrained modulus and permeability coefficient; the influence of filling liquid mode on the ground final settlement is very small ,but on the pore water pressure peak is remarkable.

scholarly journals Strengthening the Rigidity of Landslide Materials Measured by Seismic Interferometry

2021 ◽  
Vol 13 (14) ◽  
pp. 2834
Author(s):  
Keng-Hao Kang ◽  
Wei-An Chao ◽  
Che-Ming Yang ◽  
Ming-Chien Chung ◽  
Yu-Ting Kuo ◽  
...  
Keyword(s):  
Pore Water Pressure ◽  
Water Pressure ◽  
Recovery Process ◽  
Mechanistic Explanation ◽  
Seepage Water ◽  
Vertical Force ◽  
Water Tank ◽  
Rainy Period ◽  
Intense Precipitation ◽  
Stress Dependent

Landslides have caused extensive infrastructure damage and caused human fatalities for centuries. Intense precipitation and large earthquakes are considered to be two major landslide triggers, particularly in the case of catastrophic landslides. The most widely accepted mechanistic explanation for landslides is the effective-stress dependent shear strength reduction due to increases in pore water pressure. The Chashan landslide site, selected for the present study, has been intensively studied from geological, geophysical, geodetic, geotechnical, hydrological, and seismological perspectives. Our seismic monitoring of daily relative velocity changes (dv/v) indicated that landslide material decreases coincided with the first half of the rainy period and increased during the latter half of the rainy period. The geodetic surveys before and after the rainy period identified vertical subsidence without horizontal movement. The results from the multidisciplinary investigation enabled us to draw a conceptual model of the landslide recovery process induced by water loading. Where all sliding materials were stable (safety factor > 1.0), unconsolidated landslide colluvium and impermeable sliding surfaces trapped the seepage water to form a water tank, provided that compact forces were acting on the materials below the sliding boundary. The vertical force of compaction facilitates an increase in the cohesion and strength of landslide materials, thereby increasing the landslide materials’ stability. We demonstrated that the recovery process periodically occurs only under the combined conditions of prolonged and intense precipitation and the related stability conditions.

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