Coupling of blasting seismographs to rock and its effectiveness for horizontal ground motion

Segarra Catasus, Pablo and Sanchidrián Blanco, José Angel and Castedo Ruiz, Ricardo and Castillo, I. del (2017). Coupling of blasting seismographs to rock and its effectiveness for horizontal ground motion. "International journal of rock mechanics and mining sciences", v. 92 ; pp. 81-90. ISSN 1365-1609. https://doi.org/10.1016/j.ijrmms.2016.12.012.

Description

Title: Coupling of blasting seismographs to rock and its effectiveness for horizontal ground motion
Author/s:
  • Segarra Catasus, Pablo
  • Sanchidrián Blanco, José Angel
  • Castedo Ruiz, Ricardo
  • Castillo, I. del
Item Type: Article
Título de Revista/Publicación: International journal of rock mechanics and mining sciences
Date: 2017
Volume: 92
Subjects:
Freetext Keywords: Blast vibration; Frequency response; Measurement standards; Anchored sensor; Sandbag; Adhesives
Faculty: E.T.S.I. de Minas y Energía (UPM)
Department: Ingeniería Geológica y Minera
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (616kB) | Preview

Abstract

In order to clarify the requirements for satisfactory coupling on rock, six methods to monitor vibrations with blasting seismographs are investigated in the longitudinal component of the vibratory motion. The methods studied consisted on placing the geophone mount on a granite surface freely (loosely), held with a sandbag, and attached with an anchor (the center of the geophone's mount was fixed with a plastic anchor, a bolt and a nut), thermal adhesive (glue), gypsum plaster (used as an adhesive) and double-sided tape. For each measuring condition, transmissibility in two mounts was assessed on a vibration shaker from 2 to 190 Hz at one or two vibration levels (5, 20 mm/s). The main findings of this work are: (1) Transmissibility varies with coupling method. It is flat at low frequencies and has a maximum at higher frequencies; in some trials mainly with anchored, glued and plastered such peak occurs outside the frequency range studied. (2) The frequency of the first maximum of transmissibility shifts towards smaller frequencies as the peak velocity increases when the bonding conditions are weak, as for free and sandbagged mounts. However, if the bonding is stiff enough, as for anchored or plastered mounts, transmissibility values at 5 and 20 mm/s are very similar. (3) The frequency of the first peak in the measured transmissibility provides a preliminary estimate of the performance of each method, so that its conditions of use should be defined upon frequency and velocity of the imposed motion, rather than using the anticipated peak acceleration, as it is currently made. These have been defined for the methods under study. (4) Anchoring and plastering provide the best performance, the later with smaller errors at high frequencies ( > 128 Hz). (5) The seismograph itself (not the coupling) is another source of error that should not be neglected specially for measurements in the low frequency range; large errors, exceeding by one order of magnitude those from coupling are obtained in the 2‒4 Hz band.

Funding Projects

TypeCodeAcronymLeaderTitle
Universidad Politécnica de MadridUPM/FGP 007033UnspecifiedUnspecifiedUnspecified

More information

Item ID: 50767
DC Identifier: http://oa.upm.es/50767/
OAI Identifier: oai:oa.upm.es:50767
DOI: 10.1016/j.ijrmms.2016.12.012
Official URL: https://www.sciencedirect.com/science/article/pii/S1365160916305627?via%3Dihub
Deposited by: Memoria Investigacion
Deposited on: 17 May 2018 06:59
Last Modified: 01 Apr 2019 12:16
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM