Analysis of Displacement in Guandi Underground Powerhouse Based on the Influence of Dislocation Surfaces

2013 ◽  
Vol 303-306 ◽  
pp. 2866-2870
Author(s):  
Meng Ke Yuan ◽  
Chun Yu Gao ◽  
Hong Chun Zheng
Keyword(s):  
Rock Mass ◽  
Opening Displacement ◽  
Measuring Range ◽  
Underground Powerhouse ◽  
Maximum Deformation ◽  
Structure Surface ◽  
Bolt Stress ◽  
Rock Mass Deformation ◽  
Structural Surface ◽  
Mass Deformation

The monitoring data suggests that the overall displacement in Guandi underground powerhouse is a little less, 87% of which is less than 30 mm, while the maximum deformation can be reached as big as 65.77mm. Combined with the study on excavated geological data, the bigger displacement part of Guandi underground powerhouse is mainly affected by the dislocation interfaces, the excavation disturbance causes an opening displacement on the rock mass near the dislocation interfaces and a much bigger displacement partially. Due to the structural surface cut rock mass, deformation coordination between the surrounding rock and the structure surface after stress applied, the stress concentration appears nearby, measuring range of bolt stress meter is excessed in large displacement cases.

Slow rock mass deformation in the mountain side north of the Tungnakvíslarjökull outlet glacier in western part of the Mýrdalsjökull glacier

2020 ◽  
Author(s):  
Þorsteinn Sæmundsson ◽  
Páll Einarsson ◽  
Joaquin Belart ◽  
Ásta Rut Hjartardóttir ◽  
Eyjólfur Magnússon ◽  
...  
Keyword(s):  
Rock Mass ◽  
Slope Failure ◽  
Aerial Photographs ◽  
Outlet Glacier ◽  
Maximum Deformation ◽  
Total Displacement ◽  
Rock Mass Deformation ◽  
Mountain Side ◽  
Main Ideas ◽  
Mass Deformation

<p>A large slow rock mass deformation has been detected in a mountain side north of the Tungnakvíslarjökull outlet glacier, located in the western part of the Mýrdalsjökull glacier in Iceland. A group of scientist from the University of Iceland, National Land Survey and Icelandic GeoSurvey have worked on collecting data from several sources and installed monitoring equipment at the site. According to observations, which were based on comparison of DEM from aerial photographs from 1945 to 2019, the slope has been showing slow rock mass deformation since at least 1945. The rate of movements has been estimated for the period from 1945 to 2019. The data show that the total displacement since 1945 is around 200 m. The data also indicate that the deformation rate has not been constant over this time period and the data shows that the maximum deformation was between 1999 and 2004 of total of 94 m or about 19 m/year.</p><p>The mountain slope north of the Tungnakvíslarjökull outlet glaciers reaches up to around 1100 m height. The head scarp of the slide, which is almost vertical, is around 2 km wide rising from about 4-500 m in the western part up to the Mýrdalsjökull glacier at 1100 m in the east. The total sliding from the head scarp down to the present day ice margin is around 1 km<sup>2</sup>. The total volume of the moving mass is not known as the sliding plane is not known, but the minimum volume might be between 100 to 200 million m<sup>3</sup>. The entire slope shows signs of displacement and is heavily fractured and broken up. A GPS station that was installed in the uppermost part of the slope in August shows that the slope is moving about 3-9 mm per day, at a constant rate since installation.</p><p>There are two main ideas of the causes for this slow rock mass deformation. One is the consequences of slope steepening by glacial erosion, followed by unloading and de-buttressing due to glacial retreat. Another proposed cause for the deformation is related to its location on the western flank of the Katla volcano. Persistent seismic activity in this area for decades may be explained by a slowly rising cryptodome, which may also explain the slope failure.</p>

The Dangerous Rock Mass Deformation Analysis with Application of Kalman Filter Method Based on Material Properties and AR Model

2013 ◽  
Vol 738 ◽  
pp. 109-112
Author(s):  
Fu Min Lu ◽  
Ting Yao Jiang
Keyword(s):  
Kalman Filter ◽  
Rock Mass ◽  
Ar Model ◽  
Deformation Analysis ◽  
Filter Method ◽  
The Status ◽  
Rock Mass Deformation ◽  
Kalman Filter Method ◽  
Mass Deformation ◽  
Dangerous Rock Mass

Considering the material property of the rock to the dangerous rock mass,the paper Looks the model parameter of AR( 1) model as the status vector, and uses Kalman filter method to analysis the deformation of the dangerous rock mass. The result shows that the method can improve the accuracy of fitting and forecasting of the model.

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