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Site characterization by seismic dilatometer (SDMT) in the city of L'Aquila
No full textThis paper presents a review of results obtained by a large number of seismic dilatometer tests (SDMT) carried out in the area. of L’Aquila (central Italy), after the April 6, 2009 earthquake. Due to the characteristics of the soils (mostly coarse-grained, non-penetrable materials), SDMT measurements were generally performed in backfilled boreholes, using the technique briefly described;. in these conditions only the shear wave velocity Vs, without the other DMT parameters, was measured. The test results illustrated. in the paper include: (a) SDMT typical results obtained by the normal penetration procedure (in a limited number of sites, mostly. silts); (b) Vs-only profiles obtained by the backfilled borehole procedure; (c) comparisons of Vs profiles obtained by SDMT and by. other techniques (Down-Hole, Cross-Hole, surface waves tests); (d) comparisons of Vs measured by SDMT and those estimated from mechanical DMT data. The Vs profiles provided by SDMT, combined with the information obtained from geological data and. from other investigations, including boreholes down to a maximum depth of 300 m in the city centre, have been used for the soil characterization in numerical seismic response analyses. An example is illustrated in the paper
Site characterization by Seismic Dilatometer (SDMT) in the area of L'Aquila following the April 6, 2009 earthquake
No full textThis paper comments on the results obtained by a large number of Seismic Dilatometer Tests (SDMT) executed in the area of L’Aquila (Italy) following the April 6, 2009 earthquake. SDMT soundings were executed by the normal penetration procedure only in a limited number of sites, mostly in silt. At the majority of the sites, in coarse-grained non-penetrable soils, VS measurements by SDMT— but not the other DMT parameters—were obtained in backfilled boreholes, using the technique briefly described in the paper. The test results illustrated in the paper include: (a) SDMT results obtained by the normal penetration procedure, (b) VS-only profiles obtained by the backfilling procedure, (c) comparisons of VS profiles obtained by SDMT and by other techniques (Down-Hole, Cross-Hole, surface waves tests), and (d) comparisons of profiles of VS measured by SDMT and estimated from mechanical DMT data
First calorimetric energy reconstruction of beam events with ARAPUCA light detector in protoDUNE-SP
No full textProtoDUNE Single Phase at CERN is the large-scale prototype for the far detector of the future DUNE experiment. ProtoDUNE is in stable operation since Oct. 2018 at the CERN Neutrino Platform. Test beam data in the energy range of sub-GeV to a few GeV were collected in fall 2018 providing a set of key measurements. Particles (electrons, protons, pions, muons and kaons) are identified combining information from a set of beam-line detectors (Time of Flight, Cherenkov) and TPC reconstruction. Three different technologies are implemented in the protoDUNE photon detector system (PDS). Results from the response of ARAPUCA, one of the PDS components, are presented providing first calorimetric energy measurements of beam events from liquid argon scintillation light signals
Site characterization by Seismic Dilatometer (SDMT) in the area of L'Aquila following the April 6, 2009 earthquake
No full textThis paper comments on the results obtained by a large number of Seismic Dilatometer. Tests (SDMT) executed in the area of L’Aquila (Italy) following the April 6, 2009 earthquake. SDMT. soundings were executed by the normal penetration procedure only in a limited number of sites, mostly. in silt. At the majority of the sites, in coarse-grained non-penetrable soils, Vs measurements by SDMT — . but not the other DMT parameters — were obtained in backfilled boreholes, using the technique briefly. described in the paper. The test results illustrated in the paper include: (a) SDMT results obtained by the. normal penetration procedure, (b) Vs-only profiles obtained by the backfilling procedure, (c) comparisons. of Vs profiles obtained by SDMT and by other techniques (Down-Hole, Cross-Hole, surface waves tests),. and (d) comparisons of profiles of Vs measured by SDMT and estimated from mechanical DMT data
Validation of Medusa DMT test procedures in Fucino clay
No full textThe Medusa DMT is a self-contained, fully automated cableless probe able to autonomously perform dilatometer tests
using a blade of standard dimensions. The pressurization is applied using a hydraulic motorized syringe which actuates a volume
controlled expansion of the membrane. This procedure is highly repeatable, operator-independent and capable to impose a
programmable pressurization rate for achieving the DMT pressure readings. The motorized syringe, controlled by the electronic
board, is also able to maintain the membrane in equilibrium with negligible displacement, allowing to implement alternative test
procedures. This paper illustrates the results of a field-testing campaign specifically planned to validate/compare different Medusa
DMT test procedures at Fucino-Telespazio (Italy), a well-documented benchmark test site constituted by a geologically NC,
cemented, quite homogeneous soft lacustrine clay of high plasticity. The comparison of results obtained by Medusa DMT adopting
three different test procedures (Standard, Repeated A-readings, A-reading while penetrating) and by traditional pneumatic DMT
indicates substantial accuracy and consistency of measurements provided by all test procedures
Comparisons CPT-DMT in soft clay at Fucino-Telespazio GeoTest site
No full textThis paper presents the comparison of results obtained from CPT/CPTU tests carried out in past investigations and from recent DMT tests carried out using the automated Medusa DMT, adopting different test procedures (standard, repeated A-readings, A-reading while penetrating), at the benchmark soft clay test site of Fucino-Telespazio, Italy. In particular, the depth profiles of the undrained shear strength su of the Fucino clay obtained from CPT/CPTU interpretation are compared with the su profiles obtained from standard DMT and from Medusa DMT using different test procedures, as well as with the su values obtained from field vane test (FVT), self boring pressuremeter test (SBPT) and laboratory tests available from past investigations, resulting generally in good agreement
Validation of Medusa DMT test procedures in Fucino clay
No full textThe Medusa DMT is a self-contained, fully automated cableless probe able to autonomously perform dilatometer tests using a blade of standard dimensions. The pressurization is applied using a hydraulic motorized syringe which actuates a volume controlled expansion of the membrane. This procedure is highly repeatable, operator-independent and capable to impose a programmable pressurization rate for achieving the DMT pressure readings. The motorized syringe, controlled by the electronic board, is also able to maintain the membrane in equilibrium with negligible displacement, allowing to implement alternative test procedures. This paper illustrates the results of a field testing campaign specifically planned to validate/compare different Medusa DMT test procedures at Fucino-Telespazio (Italy), a well-documented benchmark test site constituted by a geologically NC, cemented, quite homogeneous soft lacustrine clay of high plasticity. The comparison of results obtained by Medusa DMT adopting three different test procedures (Standard, Repeated A-readings, A-reading while penetrating) and by traditional pneumatic DMT indicates substantial accuracy and consistency of measurements provided by all test procedures
Post event site investigation, monitoring, stability analysis and modeling of a gas pipeline explosion
No full textThis paper describes the results of site investigations, monitoring, stability analyses and soil-pipe interaction modeling of a built-up slope located near Pineto (Abruzzo Province, Central Italy) where a gas pipeline exploded on March 6th, 2015 due to heavy rains inducing slope movements. The slope is formed by OC clay, covered with an upper 10-14 m thick clayey-sandy silt colluvial layer. The explosion in the upper portion of the slope caused extensive damage to existing buildings and threatened human lives. Soon after the event, a site investigation and monitoring program was carried out. A detailed topographic survey and hydrological data were analyzed in order to characterize possible critical rainfall events. The stability of the slope was analyzed both in pre- and in post-explosion conditions. The profiles of the DMT horizontal stress index KD helped to identify multiple slip surface. Then, the results of the site investigation and stability analyses were used to implement a simplified finite element model aimed to describe the soil-pipeline interaction, taking into account the role of the observed wrinkle in the pipeline. The numerical simulations reveal the crucial role played by the slope movements, and by the wrinkle as well, in inducing the collapse of the pipe
Site characterization and seismic response analysis in the area of Collemaggio, L'Aquila (Italy)
No full textSite characterization by seismic dilatometer (SDMT) in the area of L'Aquila
No full textThe seismic dilatometer (SDMT) is the combination of the standard flat dilatometer (DMT) with a seismic module for measuring the shear wave velocity VS. This paper presents the most significant results obtained by SDMT in the area of L'Aquila following the April 6, 2009 earthquake
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