Abstract
Deep vibro-techniques impart vibrations into the ground to achieve targeted improvement. One of the common geotechnical challenges of these techniques is the question of how vibration attenuates over distance and its effect on nearby structures. In this paper, ground vibration data from several deep vibro-technique projects with different vibrators are analysed. Best-fit estimates of the field data are evaluated through analytical regression, and comparisons of the field data against requirements from some standard codes of practice for admissible vibrations are made. A preliminary estimate of ground vibration levels can be obtained from the empirical relations of vibrator energy and distance. Such an assessment, when coupled with the monitoring and collection of actual field data, should enable further predictions to be more refined. In addition to analysing ground vibration data, predictions of ground vibration and comparisons of theoretical predictions against regressions of the field data are demonstrated. Average estimates of soil profile and strengths are included in the evaluations as well. Suggestions for better predictability of ground vibrations are also given. Moreover, recommendations for safe working distances from existing structures or services are made for different types of vibrators and vibro-techniques.
Highlights
As more and more structures continue to be built in the proximity of other existing structures and amenities, construction-related impact to structures becomes a vital topic of interest
This paper discusses the peak particle velocity (PPV) that is generated from the installation of deep vibro-technique solutions
The applicabilities of the different PPV estimation approaches were checked on the basis of the gathered data
Summary
As more and more structures continue to be built in the proximity of other existing structures and amenities, construction-related impact to structures becomes a vital topic of interest. Construction-related vibrations are one such source of potential impact, as these vibrations can cause unintended ground deformation that can potentially lead to structural dilapidation. Construction activities that utilise impact energy or vibratory energy for their execution are the usual sources of ground vibrations. These activities include numerous deep foundation and ground improvement techniques, such as pile driving, sheet piling installation, blasting, percussion drilling, dynamic compaction, dynamic replacement, surface compaction, rapid impact compaction and deep vibro-techniques. Deep vibro-techniques, as per BS EN 14731 (BSI, 2005), are ground improvement products that are installed using a depth vibrator. Vibro-replacement or vibrostone column is a ground improvement method where compacted granular columns are installed to boost the bearing capacity, shear strength, stiffness and drainage properties of weak soils. Vibrocompaction is a ground improvement method that is used to densify loose cohesionless layers
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