scholarly journals WAVES LOAD ACTING ON MODULAR FLOATING PONTOON GUIDED BY PILES PLACED ON THE FRONT OF VERTICAL WALL

2019 ◽  
Vol 10 (2) ◽  
Author(s):  
Irham Adrie Hakiki ◽  
Vilda Ariviana ◽  
Ika Nur Afifah ◽  
Leo Eliasta Sembiring
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Vertical Wall ◽  
Pilot Project ◽  
Irregular Waves ◽  
Wall Structure ◽  
Physical Model Test ◽  
Floating Structure ◽  
The Waves ◽  
Measuring Force

Experimental Station for Coastal  developed a pilot project of modular concrete floating structure that served as a quay at Kalibaru in North Jakarta. The structure guided by piles and placed in front of Jakarta Coastal Dyke which is a vertical wall structure. From evaluating the structure performance, it is found that the strength of the pile is an important factor for service life of the structure. To provide this, a physical model test of the floating pontoon module guided by piles was conducted at the Laboratory of Balai Litbang Pantai. The model used to determine the behavior of the structure and loads that must be hold by the pile as a seakeeping mechanism. It is done by measuring force acting on piles that caused by pontoon impact by using load cells. The pontoon loaded by regular and irregular waves. From the tests result, the recorded forces has an impuls pattern which have maximum value of 112.67 N. The load that occurs on the pile was not spread evenly on the four piles that hold the floating module. The disrepancy are around 2 – 40%.   The forces acting on piles depends on the ponton distance to the vertical wall. The forces increases along with the increases of relative distances of structure to vertical wall  to the wavelength. The presence of vertical vall caused this increase because it amplify the waves acting on the structure. The amplification effect are the greatest when the structure distrance from the wall is the multiplication factor of halves of wavelength.Keywords : physical model test, pontoon, floating quay, pile guide, impact force

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.

scholarly journals An Improved Empirical Model for Flood Discharge Atomization and Its Application to Optimize the Flip Bucket of the Nazixia Project

2019 ◽  
Vol 16 (3) ◽  
pp. 316 ◽  
Author(s):  
Jijian Lian ◽  
Junling He ◽  
Fang Liu ◽  
Danjie Ran ◽  
Xiaoqun Wang ◽  
...  
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Empirical Model ◽  
Rainfall Intensity ◽  
Droplet Diameter ◽  
Heavy Rain ◽  
Physical Model Test ◽  
Rain Area ◽  
Left Wall ◽  
Flood Discharge

Flood discharge atomization is a serious challenge that threatens the daily lives of the residents around the dam area as well as the safety of the water conservancy project. This research aims to improve the prediction accuracy of the stochastic splash model. A physical model test with four types of flip bucket is conducted to obtain the hydraulic parameters of the impinging outer edge of the water jet, the relationship of the splashing droplet diameter with its corresponding velocity, and the spatial distribution of the downstream nappe wind. The factors mentioned above are introduced to formulate the empirical model. The rule obtained from the numerical analyses is compared with the results of the physical model test and the prototype observations, which yields a solid agreement. The numerical results indicate that the powerhouse is no longer in the heavy rain area when adopting the flip bucket whose curved surface is attached to the left wall. The rainfall intensity of the powerhouse is significantly weaker than that of other types under the designed condition, so we choose it as the recommended bucket type. Meanwhile, we compare the rainfall intensity distribution of the original bucket and the recommended bucket under different discharge which rates ranging from 150.71 to 1094.9 m3/s. It is found that the powerhouse and the owner camp are no longer in the heavy rain area under all of the working conditions. Finally, it is shown that the atomization influence during the flood discharge can be reduced by using the recommended bucket.

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