scholarly journals Determination of the ground vibration attenuation law from a single blast: A particular case of trench blasting

2021 ◽  
Author(s):  
Rafael Rodríguez ◽  
Laura García de Marina ◽  
Marc Bascompta ◽  
Cristóbal Lombardía
Keyword(s):  
Ground Vibration ◽  
Attenuation Law ◽  
Vibration Attenuation

Research on the Vibration Attenuation Rules and Wave Propagation Law under Impacting Drill on the Deep Soil Layer

2011 ◽  
Vol 250-253 ◽  
pp. 1971-1977
Author(s):  
Bo Zhang ◽  
Lian Jin Tao ◽  
Wen Pei Wang ◽  
Ji Dong Li
Keyword(s):  
Wave Propagation ◽  
Soil Layer ◽  
Ground Surface ◽  
Ground Vibration ◽  
Vibration Source ◽  
Vertical Acceleration ◽  
Deep Soil ◽  
Deep Soil Layer ◽  
Propagation Law ◽  
Vibration Attenuation

A field test is carried out to study the effect of vibration while treating foundation using vibroflotation method in the deep soil layer in Zhengzhou, China. The vibration attenuation rules and wave propagation rules in different formations caused by different numbers of drills are analyzed. Evaluate the influence on the adjacent buildings. The result shows that the vibration will be generated in foundation obviously in the process of construction using the method. Vibration force, impact frequency and site soil are important influence factors on ground vibration attenuation. The analysis reveals that the maximum vertical acceleration attenuation velocity was much greater in near area than that in the relative far area. The waves caused by vibration propagate in two ways: (1) surface wave is generated on the wall of drill hole and propagated to the ground surface, and attenuated in a certain distance (<8m); (2) shear wave was generated and propagated in the impacting formation and attenuated from the deep formation to the ground surface. Vibration amplitude is mainly distributed in the low frequency range in the areas which far away from vibration source and in the silt layer near the ground surface.

Vibration Propagation Law in Different Areas of Tunnel Face Caused by Blasting

2015 ◽  
Vol 744-746 ◽  
pp. 1005-1009
Author(s):  
Jian Jun Shi ◽  
Li Xue ◽  
Qi Zhang ◽  
Hai Li Meng
Keyword(s):  
Attenuation Coefficient ◽  
Blasting Vibration ◽  
Tunnel Face ◽  
Attenuation Law ◽  
Geological Conditions ◽  
Propagation Law ◽  
Blasting Excavation ◽  
Attenuation Index ◽  
Vibration Attenuation ◽  
Cutting Zone

According to the position and role of borehole, the tunnel face is divided into three regions undercutting area, auxiliary area and surrounding areas and each region have different blasting vibration attenuation law. Using blasting vibration testing instrument TC-4850, the vibration caused by blasting excavation in different region of Chongqing terminal connecting line tunnel was monitored and analyzed, and the vibration characteristics and attenuation law of different region in tunnel face were gained. The results show that: the maximum blasting vibration value was produced in cutting area of tunnel; using the partial excavation and setting large diameter hollow hole in the cut area can effectively reduce the blasting vibration, and the more the number of hollow hole, the damping effect was more significant; vibration attenuation parameters were different in different blasting area in tunnel face and with the increase of excavation area, the vibration attenuation coefficient was gradually decreased. Vibration attenuation index was determined by the geological conditions, basically unchanged, the value of the auxiliary area was 0.5~0.67 times the cutting zone, the value of the surrounding area was 0.25~0.33 times the cutting zone. When adopting sub-steps and sub-regional excavation in small spacing tunnel of Chongqing area, vibration attenuation coefficient can be valued by cutting areas 110~120, auxiliary area 60~80, surrounding region 30~40 and vibration attenuation index can be valued by cutting area 1.5, auxiliary and surrounding region 1.6.

Feasibility of indirect determination of blast induced ground vibration based on support vector machine

Measurement ◽  
2015 ◽  
Vol 75 ◽  
pp. 289-297 ◽  
Author(s):  
Mahdi Hasanipanah ◽  
Masoud Monjezi ◽  
Azam Shahnazar ◽  
Danial Jahed Armaghani ◽  
Alireza Farazmand
Keyword(s):  
Support Vector Machine ◽  
Ground Vibration ◽  
Support Vector ◽  
Indirect Determination

scholarly journals Ground Vibration Attenuation Measurement using Triaxial and Single Axis Accelerometers

2018 ◽  
Vol 995 ◽  
pp. 012113
Author(s):  
A H Mohammad ◽  
N A Yusoff ◽  
A Madun ◽  
S A A Tajudin ◽  
M N H Zahari ◽  
...  
Keyword(s):  
Ground Vibration ◽  
Attenuation Measurement ◽  
Vibration Attenuation

Analysis and Prediction of Ground Vibration Induced by High-Speed Train

2013 ◽  
Vol 779-780 ◽  
pp. 731-738 ◽  
Author(s):  
Ke Xin Zhang ◽  
Jian Wei Yao ◽  
Ze Ping Zhao
Keyword(s):  
Neural Network ◽  
Test Data ◽  
High Speed ◽  
Ground Vibration ◽  
Vertical Vibration ◽  
Orthogonal Test ◽  
Vibration Level ◽  
High Speed Train ◽  
High Speed Railway ◽  
Vibration Attenuation

The principal aim of this paper is to determine the reasonable design parameters of high-speed railway vibration attenuation. The orthogonal test method is used to design the test of ground vibration induced by high-speed train. Four main factors that impact the maximum ground vertical vibration level are selected, and different values are given to each factor, so 8 groups of combinations can be obtained by using orthogonal test technique. Each group test data of the maximum ground vertical vibration level can be obtained by conducting vehicle testing on-track. In this paper, the primary and secondary factors that impact the maximum ground vertical vibration level are determined by range analysis. Moreover, the neural network theory is used to establish a model of the ground vertical vibration level, and this model can be trained and verified by the test data. The impact factors can be predicted by the method of combining orthogonal test and neural network concerning the specified vibration limit, and the value of maximum ground vertical vibration level with the predicted factors meets the requirement of accuracy. The conclusions provide a valuable reference to the vibration attenuation design of the high-speed railway.

Determination of the Vertical Vibration of a Ballasted Railway Track to Be Used in the Experimental Detection of Wheel Flats in Metropolitan Railways

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Ricard Sanchís ◽  
Salvador Cardona ◽  
Jordi Martínez
Keyword(s):  
Impulse Response ◽  
Vertical Vibration ◽  
Railway Track ◽  
Vibration Velocity ◽  
Kernel Convolution ◽  
Wheel Rolling ◽  
Vibration Attenuation ◽  
Wheel Profile ◽  
Convolution Method

This paper presents a mathematical model used to obtain the vertical vibration of a ballasted railway track when a wheel is passing at a certain speed over a fixed location of the rail. The aim of this simulation is to compare calculated root-mean-square (RMS) values of the vertical vibration velocity with measured RMS values. This comparison is the basis for a proposed time domain methodology for detecting potential wheel flats or any other singular defect on the wheel rolling bands of metropolitan trains. In order to reach this goal, a wheel–rail contact model is proposed; this model is described by the track vertical impulse response and the vertical impulse response of the wheel with the primary suspension, both linked through a Hertz nonlinear stiffness. To solve the model for obtaining the wheel–rail contact force, a double convolution method is applied. Several kinds of wheel flats are analyzed, from theoretical round edged wheel flats to different real wheel profile irregularities. Afterward, the vertical vibration velocity at a fixed point on the rail is obtained using a variable kernel convolution method. Running different simulations for different wheel flats, a study of the vertical vibration attenuation along the rail is carried out. Finally, it is proceeded to obtain the temporary evolution of the RMS value for the rail vertical vibration velocity in order to be used as a reference for detecting wheel flats or any other defect. This last aspect will be presented in more detail in a second paper.

Three-Dimensional Finite Element Simulations of Ground Vibration Generated by High-Speed Trains and Engineering Countermeasures

2005 ◽  
Vol 11 (12) ◽  
pp. 1437-1453 ◽  
Author(s):  
Judith C. Wang ◽  
Xiangwu Zeng ◽  
Robert L. Mullen
Keyword(s):  
Finite Element ◽  
Asphalt Concrete ◽  
High Speed ◽  
Three Dimensional ◽  
Ground Vibration ◽  
Finite Element Simulations ◽  
Modified Asphalt ◽  
Vibration Attenuation ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In this paper we discuss the benefits of using rubber-modified asphalt concrete in high-speed railway foundations. We present the results from a series of three-dimensional finite element simulations modeling a high-speed train foundation utilizing various trackbed materials. Four trackbed materials were tested for their relative vibration attenuation capacities: ballast, concrete, conventional asphalt concrete, and rubber-modified asphalt concrete. Additionally, studies varying the speed and the weight of the passing train were performed. Parametric studies varying the dimensions of the trackbed underlayment were also examined. From these numerical simulations, it is shown that rubber-modified asphalt concrete outperforms other traditional paving materials in ground vibration attenuation. It is also shown that the speeds and weights of the passing trains and the dimensions of the trackbed have significant effects on the relative performance of the paving materials. Implications for design are discussed.

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