Ground vibration analysis

Ground vibration analysis is hugely important in terms of the operation of sensitive equipment. A number of ground properties have a natural effect on vibration, from the stiffness of the floor system in place to qualities like damping and natural frequency and more.

The vibration level at a distance depends on charge per delay, vibration frequency, rock characteristics (type, unit weight, layering, slope of layers), blast hole conditions, presence of water, propagation of surface and body waves in the ground, and to a lesser extent on method of initiation.

How far (amplitude or intensity), and how fast (frequency) the object moves helps determine its vibrational characteristics. The terms used to describe this movement are frequency, amplitude and acceleration.

Our Procedure

Ground Vibration can be caused by construction, equipment or blasting, etc. Seismographs can be used to measure and record ground vibration. It is measured in terms of Peak Particle Velocity (PPV) and the units are mm/s. PPV refers to the movement within the ground of molecular particles and not surface movement.

The main sources of ground vibrations at construction are pile driving, dynamic compaction, blasting, and operation of heavy construction equipment. These vibrations may harmfully affect surrounding buildings, and their effect ranges from disturbance of residents to visible structural damage.

Drilling and blasting method as a common excavation method is widely used in the underground engineering construction. However, in the complicated geological conditions, the path of blasting excavation available has limitation, and then the larger blasting vibration is produced, which influence the stability and safety of the protected structure. To effectively reduce the blasting vibration by optimizing the blasting excavation method, firstly, the site test on blasting vibration is conducted to obtain the blasting vibration data; secondly, the software is applied to simulate the vibration generated by blasting in site test, based on back analysis on the blasting vibration, the mechanical parameters of the rock mass are obtained, and they are used to simulate six different types of blasting excavation method. According to the analysis on them, the reasonable blasting excavation method is proposed to reduce the blasting vibration which can satisfy the blasting safety regulation.

Ground Vibration Monitoring Standards In India

Type Of Structures Dominant Excitation Frequency
< 8Hz 8- 25 Hz > 25Hz
A) Buildings/ structures not belonging to the owner
Domestic Houses /Structures (Kacha, Brick and Cement) 5 10 15
Industrial buildings (RCC and Framed Structure). 10 20 25
Objects of Historical Importance and Sensitive structures 2 2 10
B) Buildings belonging to the owner with limited span of life.
Domestic Houses /Structures (Kacha, Brick and Cement). 10 15 20
Industrial buildings (RCC and Framed Structure). 15 25 50

Benefits of Ground vibration analysis

Reduces labor costs

Increases revenue

Increases safety

Reduces equipment costs

Reduces lost production time

Increases efficiency of employee time

Applications

Drilling

Boring

Excavation

Sheet Pilling

Structure Vibration

Building Construction

Surrounding Vibration check

Esteemed Customers

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