A large-scale physical model test on frozen status in freeze-sealing pipe roof method for tunnel construction

2018 ◽  
Vol 72 ◽  
pp. 55-63 ◽  
Author(s):  
Xiangdong Hu ◽  
Tao Fang ◽  
Jin Chen ◽  
Hui Ren ◽  
Wang Guo
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Large Scale ◽  
Physical Model Test ◽  
Tunnel Construction

scholarly journals WAVE RUN-UP PREDICTION VS. MODEL TEST RESULTS: A COMPARISON

1988 ◽  
Vol 1 (21) ◽  
pp. 47 ◽  
Author(s):  
Peter E. Gadd ◽  
Victor Manikian ◽  
Jerry L. Machemehl
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Large Scale ◽  
Physical Model Test ◽  
Roughness Coefficient ◽  
Wave Steepness ◽  
Test Results ◽  
Shore Protection ◽  
Run Up

Large-scale physical model test measurements of wave run-up are compared with wave run-up prediction derived from the Shore Protection Manual (SPM). Noteworthy discrepancies between the results of these two methods have been identified that include substantial overestimation of wave run-up elevations using the SPM approach, and computation of roughness coefficient values that vary as a function of wave steepness. The slope armors tested in the study at model scales of 1:3 and 1:4 include linked concrete matting and overlapped gravel-filled fabric bags.

scholarly journals Correction of Earth Pressure and Analysis of Deformation for Double-Row Piles in Foundation Excavation in Changchun of China

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Yijun Zhou ◽  
Aijun Yao ◽  
Haobo Li ◽  
Xuan Zheng
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Large Scale ◽  
Similarity Theory ◽  
Earth Pressure ◽  
Physical Model Test ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Double Row ◽  
The Earth

In order to study the earth pressure and the deformation behavior of the double-row piles in foundation excavation, a large-scale physical model test was introduced to simulate deformation of double-row piles in foundation excavation based on the principle of similarity theory in this paper. Represented by the deep foundation pit engineering of Changchun, the strain and the displacement of the double-row piles and the earth pressure are calculated by the above-mentioned physical model test. Then a numerical simulation has been carried out to validate practicability of the physical model test. The results show that the strain and the displacement of the front-row piles are larger than the back-row piles. The earth pressure of the front-row piles appears to be “right convex,” correcting the specification of the earth pressure and putting forward the coefficient of β. The results in this paper may provide constructive reference for practical engineering.

Research on Plane Strain Model Test of Rockburst of Underground Cavern in Hard Brittle Rockmass

2014 ◽  
Vol 501-504 ◽  
pp. 1810-1814 ◽  
Author(s):  
Yu Zhou Jiang ◽  
Rui Hong Wang ◽  
Tian Cai Tang ◽  
Jin Long Guo
Keyword(s):  
Physical Model ◽  
Plane Strain ◽  
Model Test ◽  
Large Scale ◽  
Failure Process ◽  
Initial Crack ◽  
Physical Models ◽  
Brittle Rock ◽  
Physical Model Test ◽  
Underground Cavern

In order to study the failure process and mechanism of rockburst of underground cavern, the physical model materials of hard brittle rock which is gotten though similar material test and have the tendency of rockburst are prepared for making cavern physical models of 1000mm*1000 mm*1000mm and φ 150mm. Then plane strain physical model test is carried out on the machine for large-scale physical model test in geotechnical engineering. The results show that the state of rock switches from the elastic to the plastic on the condition that horizontal and vertical load of the model is equal and increase synchronously. The failures of hard brittle rock burst in surrounding rock are mainly in the initial crack of rock. The phenomenon of separation by layer appears around the cave walls. Damage occurs in very short time and extremely narrow loading range and is sudden with chippings popping or fragments falling. After failure rock stress readjusts and keeps relatively stable in a relatively long time and loading range.

Model Test Study on Influences of Layered Rock Mass Dip Angle on Stability of Deep-Buried Tunnel

2011 ◽  
Vol 90-93 ◽  
pp. 2363-2371
Author(s):  
Bin Wei Xia ◽  
Ke Hu ◽  
Yi Yu Lu ◽  
Dan Li ◽  
Zu Yong Zhou
Keyword(s):  
Rock Mass ◽  
Physical Model ◽  
Model Test ◽  
Physical Models ◽  
Physical Model Test ◽  
Stress Distributions ◽  
Failure Characteristics ◽  
Layered Rock ◽  
Layered Rock Mass ◽  
Dip Angle

Physical models of layered rock mass with different dip angles are built by physical model test in accordance with the bias failure characteristics of surrounding rocks of layered rock mass in Gonghe Tunnel. Bias failure characteristics of surrounding rocks in thin-layered rock mass and influences of layered rock mass dip angle on stability of tunnel are studied. The research results show that failure characteristics of physical models generally coincide with those of surrounding rocks monitored from the tunnel site. The failure regions of surrounding rock perpendicular to the stratification planes are obviously larger than those parallel to. The stress distributions and failure characteristics in the surrounding rocks are similar to each physical model of different dip angles. The stress distributions and failure regions are all elliptic in shape, in which the major axis is in the direction perpendicular to the stratification planes while the minor axis is parallel to them. As a result, obvious bias failure of surrounding rocks has gradually formed. The physical model tests provide reliable basis for theoretical analysis on the failure mechanism of deep-buried layered rock mass.

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