Blasting Excavation and Vibration Monitoring Design for Diversion Tunnel

2013 ◽  
Vol 639-640 ◽  
pp. 969-973
Author(s):  
Qi Gao Hu ◽  
Wei Feng Cui ◽  
Jing Wei Gao ◽  
Fei Wei Zhao ◽  
Qian Fu Liang
Keyword(s):  
Optimization Design ◽  
Theoretical Calculations ◽  
Concrete Block ◽  
Arch Dam ◽  
Vibration Monitoring ◽  
Jiangxi Province ◽  
Diversion Tunnel ◽  
Monitoring Design ◽  
Double Curvature ◽  
Blasting Excavation

Because of the local crack and seepage, a double curvature arch dam of concrete block in Jiangxi Province was urgently needed to strengthen, and the construction period was limited seriously. In order to solve the problem of drainage, a diversion tunnel about 24m must get throng in two weeks, and it is proved that the blasting excavation scheme is the only choice. Meanwhile, monitoring measurement must be taken to ensure the dam’s safety. In this article, the optimization design of blasting excavation and a vibration monitoring are completed and carried out respectively. Theoretical calculations and monitoring results showed that, those design schemes are scientific and rational, and disadvantageous effect of blasting vibration is under the control fully.

Shape Optimization Design of Gravity Buttress of Arch Dam Based on Asynchronous Particle Swarm Optimization Method

2014 ◽  
Vol 662 ◽  
pp. 160-163
Author(s):  
Lei Xu
Keyword(s):  
Particle Swarm Optimization ◽  
Optimization Design ◽  
Design Method ◽  
Particle Swarm ◽  
Optimization Method ◽  
Arch Dam ◽  
Swarm Optimization ◽  
Safety Coefficient ◽  
Parametric Description ◽  
Particle Swarm Optimization Method

The optimization design method was rarely used to design the gravity buttress of arch dam in the past. With this in mind, the parametric description of gravity buttress is given, and the auto-calculation of its exerting loads and the safety coefficient of anti-slide stability are realized subsequently. Then, the optimization design model of gravity buttress and the procedures of optimization design are presented using the asynchronous particle swarm optimization method. Finally, ODGB software, which is short for Optimization Design of Gravity Buttress software, is developed and verified.

Study on the Drafting and Early-Warning of Temperature Double-Control Index of Different Sections & Periods of Concrete Block

2012 ◽  
Vol 188 ◽  
pp. 253-258
Author(s):  
Dong Sheng Shen ◽  
Yao Ying Huang ◽  
Yi Hong Zhou ◽  
Dan Dan Liu ◽  
Xiang Ze Gao
Keyword(s):  
Prediction Model ◽  
Probabilistic Method ◽  
Concrete Block ◽  
Arch Dam ◽  
Maximum Temperature ◽  
Measured Temperature ◽  
Dynamic Feedback ◽  
High Arch Dam ◽  
Concrete Blocks ◽  
Real Time Tracking

Although real-time tracking and feedback were carried out for the dam concrete construction process, there was still certain blindness in the construction units. The temperature double-control index, which is the allowable temperature and temperature gradient under typical age before concrete block reaching its maximum temperature, was proposed in this paper on the basis of the analysis of measured temperature process curves of concrete blocks. The probabilistic method was applied to draft the temperature double-control index of different sections and periods based on the measured temperature process curve of the poured block of a constructing extra-high arch dam in southwest China. Furthermore, the prediction model was also provided and applied in the dynamic feedback of new pouring block. It is demonstrated by the practice that the prediction model proposed in this paper has better pertinence and maneuverability for the construction units to control the maximum temperature of concrete block, i.e. the maximum temperature in high temperature season and in low temperature season are both controllable.

Safety Control of Blasting Construction in New Austrian Metro Tunnel

2012 ◽  
Vol 446-449 ◽  
pp. 2462-2465 ◽  
Author(s):  
Hong De Wang ◽  
Xiu Feng Shen
Keyword(s):  
Regression Analysis ◽  
Vibration Monitoring ◽  
Actual Condition ◽  
Vibration Velocity ◽  
Charge Weight ◽  
Blasting Vibration ◽  
Safety Control ◽  
Blasting Excavation ◽  
Tunnel Blasting ◽  
Metro Tunnel

Abstract. Through the analysis and research on the vibration effect caused by the urban New Austrian (shallow embedded) metro tunnel blasting construction, the main harming effect of the blasting vibration on the surface buildings is summarized. According to the actual condition on the site of blasting construction in No.2 line of Dalian metro tunnel, the reasonable vibration monitoring plan for blasting vibration wave is established. At the same time, by means of the regression analysis about the monitoring results of blasting vibration, the vibration wave’s regression formula are set up, which can expression the correlation among the vibration velocity, the charge weight, the distance between the blasting fountains and the buildings. The results show that the Sadaovsk formula can be use to describe the effect of the metro tunnel blasting construction on the surface buildings accurately and reasonably in this construction segment. This kind of regression analysis method can be use to direct subsequent blasting excavation.

Shape Optimization for Arch Dam with Sequential Quadratic Programming Method

2014 ◽  
Vol 580-583 ◽  
pp. 1961-1965 ◽  
Author(s):  
Yin Duan ◽  
Wei Yuan ◽  
Hui Bo Liu
Keyword(s):  
Quadratic Programming ◽  
Shape Optimization ◽  
Sequential Quadratic Programming ◽  
Optimization Design ◽  
Equivalent Stress ◽  
Arch Dam ◽  
Programming Method ◽  
Stress Computation ◽  
Sequential Quadratic Programming Method ◽  
Quadratic Programming Method

The sequential quadratic programming method is introduced in arch dam shape optimization design. In the optimization computation, the arch dam volume is taken as objective function, and the calculation is realized by automatically considering loading process, equivalent stress computation and simulation of shape optimization for arch dam based on FEM. A parabola arch dam is used as a numerical example. The result shows that the optimized figure is much safer and more practical, which indicates that the SQP method is an effective way for optimization design of arch dam shape.

scholarly journals A Simplified Method for Real-Time Prediction of Temperature in Mass Concrete at Early Age

2020 ◽  
Vol 10 (13) ◽  
pp. 4451
Author(s):  
Guo An ◽  
Ning Yang ◽  
Qingbin Li ◽  
Yu Hu ◽  
Huiting Yang
Keyword(s):  
Cement Hydration ◽  
Cooling System ◽  
Concrete Block ◽  
Arch Dam ◽  
In Situ Monitoring ◽  
Cooling Effect ◽  
Maximum Temperature ◽  
Early Age ◽  
Mass Concrete ◽  
Measuring Point

According to the practice of temperature control in dam concrete, within a few days after a concrete block is poured, the temperature at the core of the concrete rises rapidly. The maximum temperature may still exceed the standard even under a relatively perfect post-cooling system, which is mostly caused by failure to quickly and correctly judge the development of the early-age temperature. This study investigates concrete temperature at an early age via in situ monitoring data collected from Baihetan arch dam and Wudongde arch dam. A simplified algorithm of temperature prediction is formed, which only considers the heat released by cement hydration and the cooling effect of cooling pipes. The influence of a cooling pipe on the measuring point of the thermometer is investigated, and a simple empirical formula to calculate the cooling effect is obtained. An equation for the rate of hydration temperature rise is achieved by combining measured data and the formula used to calculate the cooling effect. Furthermore, through the explorations of the related data, it is determined that the cement hydration ratio of the two dams is quite low during concreting. On the basis of the data collected from the field, the method to predict temperature proposed in this study is tested and proven.

THE SEISMIC DESIGN STUDY OF A DOUBLE CURVATURE ARCH DAM.

1969 ◽  
Vol 43 (2) ◽  
pp. 217-248 ◽  
Author(s):  
PAA BACK ◽  
DR GAUKROGER ◽  
AC CASSELL ◽  
RT SEVERN ◽  
R DUNGAR
Keyword(s):  
Seismic Design ◽  
Arch Dam ◽  
Design Study ◽  
Double Curvature
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