Stability and Reinforcement of Subgrade Slope of Weathered Rock Considering the Effect of Seepage

2013 ◽  
Vol 361-363 ◽  
pp. 1472-1476
Author(s):  
Feng Gang Wang ◽  
Feng Zhang ◽  
Xian Zhang Ling ◽  
Yan Li
Keyword(s):  
Surface Element ◽  
Seepage Force ◽  
Weathered Rock ◽  
Reinforcement Measure ◽  
Engineering Measures ◽  
Shearing Strength ◽  
Seepage Theory ◽  
The Stability ◽  
Slide Area ◽  
Unsaturated Seepage

Taking the slope of K178+500-K178+550 of Beian-Heihe expressway as example, based on the steady saturated-unsaturated seepage theory and simplified the seepage force of groundwater into equivalent nodal load, then using the strength reduction finite element method to analysis the stability and potential slide area of roadbed slope which has no engineering measures; the interaction between slide-resistant pile and weathered rock can be reasonably considered by using the contact surface element, the result shows that, the safety factor of roadbed slope can be improved and the shearing strength of roadbed slope can be evenly dispersed by the reinforcement measure. The result can be used for the stability evaluation and reinforcement of subgrade slope of weathered rock area.

Ground Behaviors due to Seepage Force of Groundwater

2012 ◽  
Vol 594-597 ◽  
pp. 516-521
Author(s):  
Ling Yu Meng ◽  
Haruyuki Yamamoto
Keyword(s):  
Vertical Displacement ◽  
Seepage Flow ◽  
Unconfined Aquifer ◽  
The Finite Element Method ◽  
Seepage Force ◽  
Ground Displacement ◽  
Simulation Code ◽  
Capillary Zone ◽  
Seepage Theory ◽  
Unsaturated Seepage

Well pumping leads to both horizontal and vertical displacement, and fluctuation of groundwater level can cause serious damage to structures in a lagre affected area. Ground behaviors due to seepage force in traditional methods were rarely considered. This paper presents a numerical solution of ground displacement behaviors due to unsteady groundwater flow in unconfined aquifer by considering the effect of capillary zone based on the saturated-unsaturated seepage theory, and the numerical simulation code implemented by FORTRAN is applied to predict the flow velocity distribution and the results of ground displacement. The model uses the finite element method and finite difference method to study the problem. The analysis shows that the seepage force and the effect of capillary zone play a very important role in both seepage flow and displacement field.

Stability Analysis of High Filling Slope Affected by Precipitation Intensity

2012 ◽  
Vol 170-173 ◽  
pp. 1174-1178 ◽  
Author(s):  
Wen Tao Wang ◽  
Tao Song ◽  
Zeng Rong Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Slope Stability ◽  
Precipitation Intensity ◽  
Safety Coefficient ◽  
Stability Of Slope ◽  
Seepage Theory ◽  
The Stability ◽  
Unsaturated Seepage ◽  
Element Method

Aiming at researching on stability of slope affected by precipitation intensity, transient saturated-unsaturated seepage finite element method and slope stability finite element method are combined in this paper. Vadose field of slope is simulated in different precipitation intensity. Based on vadose field, the writers analyzed the stability of slope affected by precipitation intensity. The research results indicate that water is brought together in the interface first. Then the water level moves toward up and down respectively from the both sides of the interface. On the basis of saturated-unsaturated seepage theory, precipitation intensity has little effect on the slope stability in the first 6 hours after precipitation. After that, slope safety coefficient is relatively high when precipitation intensity is smaller, and vice versa.

Research on the Slope Stability under the Condition of Water Level Fluctuation

2012 ◽  
Vol 256-259 ◽  
pp. 350-353
Author(s):  
Er Ping Zhao ◽  
Xiao Bing Jia
Keyword(s):  
Slope Stability ◽  
Water Level ◽  
Safety Factor ◽  
Seepage Flow ◽  
Intensive Study ◽  
Water Penetration ◽  
Seepage Theory ◽  
The Stability ◽  
Rock And Soil ◽  
Unsaturated Seepage

The rise and fall of water level has great effect on the slope stability. Based on the saturated-unsaturated seepage theory, the article has an intensive study of the seepage flow field and the change law of the stability safety factor of the slope stability under the condition of fluctuation of water level. The slope stability safety factor is changing in the process of water level’s rise and fall. with the carrying out of the impoundment, slope stability safety factor decreased. The water level rises in the water lever’s rising process. Due to the penetration of water penetration, the reduce of the shear strength of rock and soil, as a result, the slope stability safety factor reduced. as the water level increased gradually, slope stability safety factor increased. After two or three days later, the slope stability safety factor tends to a stable value.

scholarly journals Solution of AntiSeepage for Mengxi River Based on Numerical Simulation of Unsaturated Seepage

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Youjun Ji ◽  
Linzhi Zhang ◽  
Jiannan Yue
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Experiment Research ◽  
Natural Conditions ◽  
Two Phase ◽  
Ground Water Pollution ◽  
Leakage Mechanism ◽  
Analysis Experiment ◽  
Seepage Theory ◽  
Unsaturated Seepage

Lessening the leakage of surface water can reduce the waste of water resources and ground water pollution. To solve the problem that Mengxi River could not store water enduringly, geology investigation, theoretical analysis, experiment research, and numerical simulation analysis were carried out. Firstly, the seepage mathematical model was established based on unsaturated seepage theory; secondly, the experimental equipment for testing hydraulic conductivity of unsaturated soil was developed to obtain the curve of two-phase flow. The numerical simulation of leakage in natural conditions proves the previous inference and leakage mechanism of river. At last, the seepage control capacities of different impervious materials were compared by numerical simulations. According to the engineering actuality, the impervious material was selected. The impervious measure in this paper has been proved to be effectible by hydrogeological research today.

Resolving pre-collapse slope motion at the February 2021 Chamoli rock-ice avalanche via feature tracking of optical satellite imagery

2021 ◽  
Author(s):  
Maximillian Van Wyk de Vries ◽  
Shashank Bhushan ◽  
David Shean ◽  
Etienne Berthier ◽  
César Deschamps-Berger ◽  
...  
Keyword(s):  
High Resolution ◽  
Satellite Imagery ◽  
Feature Tracking ◽  
Satellite Image ◽  
Image Feature ◽  
Sampling Distance ◽  
Velocity Changes ◽  
The Stability ◽  
Slide Area ◽  
Ice Avalanche

<p>On the 7<sup>th</sup> of February 2021, a large rock-ice avalanche triggered a debris flow in Chamoli district, Uttarakhand, India, resulting in over 200 dead or missing and widespread infrastructure damage. The rock-ice avalanche originated from a steep, glacierized north-facing slope with a history of instability, most recently a 2016 ice avalanche. In this work, we assess whether the slope exhibited any precursory displacement prior to collapse. We evaluate monthly slope motion over the 2015 and 2021 period through feature tracking of high-resolution optical satellite imagery from Sentinel-2 (10 m Ground Sampling Distance) and PlanetScope (3-4 m Ground Sampling Distance). Assessing slope displacement of the underlying rock is complicated by the presence of glaciers over a portion of the collapse area, which display surface displacements due to internal ice deformation. We overcome this through tracking the motion over ice-free portions of the slide area, and evaluating the spatial pattern of velocity changes in glaciated areas. Preliminary results show that the rock-ice avalanche bloc slipped over 10 m in the 5 years prior to collapse, with particularly rapid slip occurring in the summer of 2017 and 2018. These results provide insight into the precursory conditions of the deadly rock-ice avalanche, and highlight the potential of high-resolution optical satellite image feature tracking for monitoring the stability of high-risk slopes.</p>

Unsaturated Seepage and Fluid-Solid Coupling Analysis of Rainfall Infiltration of Slope

2011 ◽  
Vol 255-260 ◽  
pp. 3488-3492
Author(s):  
Bao Lin Xiong ◽  
Jing Song Tang ◽  
Chun Jiao Lu
Keyword(s):  
Pore Water ◽  
Unsaturated Flow ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Rainfall Infiltration ◽  
Medium Permeability ◽  
Stability Of Slope ◽  
Transient Seepage ◽  
The Stability ◽  
Unsaturated Seepage

Rainfall is one of the main factors that influence the stability of slope. Rainfall infiltration will cause soil saturation changing and further influence pore water pressure and medium permeability coefficient. Based on porous media saturation-unsaturated flow theory, the slope transient seepage field is simulated under the conditions of rainfall infiltration. It is shown that change of pore water pressure in slope soil lag behind relative changes in rainfall conditions. As the rainfall infiltrate, unsaturated zone in top half of slope become diminution, the soil suction and shear strength reduce, so stabilization of soil slope is reduced.

scholarly journals Grouting Reinforcement of Large Building Foundation over Old Gob Areas: A Case Study in Huaibei Mining Area, China

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Wenyan Guo ◽  
Shiqi Liu ◽  
Bingnan Hu ◽  
Yanchun Xu ◽  
Yaqi Luo
Keyword(s):  
Water Injection ◽  
Mining Area ◽  
Borehole Data ◽  
Maximum Slope ◽  
Subsidence Area ◽  
Building Foundation ◽  
Reinforcement Measure ◽  
Grouting Reinforcement ◽  
The Stability

There are more than 14,000 square kilometers of mining subsidence areas in China, most of which have been reclaimed for the construction of new buildings. In the past, few special measures were required for the foundations of small buildings above old gob areas. But a plan was created to construct a large office building 100 m in length, 90 m in width, and 100 m in height, above old gob areas in the Huaibei subsidence area. However, the results of exploration borehole data and borehole TV observation indicated a broken bedrock stratum and developmental fractures above the old gob areas, and thus, the space stabilities of the building foundation were poor. Therefore, grouting reinforcement measure was adopted for the old gob and foundation areas. And the grouting effect was examined using borehole TV observation and the water injection test, where the detection results of boreholes TV observation showed that the filling ratio of the stratum fracture was over 85%, and the stability of the foundation was obviously enhanced. In addition, we monitored the settlement of the foundation continuously for 930 days. The results show that the maximum cumulative subsidence was 15.3 mm and the maximum slope was 0.05 mm/m, which verifies that grouting reinforcement is feasible in terms of the safety of large buildings constructed over old gob areas using bedrock stratum grouting in the Huaibei subsidence area.

The Saturated - Unsaturated Seepage Analysis of Hualianshu Landslide on the Condition of Rainfall

2012 ◽  
Vol 594-597 ◽  
pp. 387-390
Author(s):  
Yu Hu ◽  
Qiang Feng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
The Finite Element Method ◽  
Seepage Field ◽  
Landslide Prediction ◽  
Reservoir Water ◽  
Seepage Analysis ◽  
Seepage Theory ◽  
The Impact ◽  
Unsaturated Seepage

With the saturated - unsaturated seepage theory, Hualianshu landslide is seepage numerical simulated by the finite element method .The changes of Hualianshu landslide seepage are subject to the impact of rainfall and reservoir water level's changes.The formation and variation of the slope seepage field under rainfall infiltration have been come to, providing a basis for analysis of slope stability and landslide prediction.

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