{"id":1963,"date":"2021-10-27T20:59:10","date_gmt":"2021-10-27T20:59:10","guid":{"rendered":"https:\/\/globalgeotech.co.uk\/?page_id=1963"},"modified":"2021-10-27T20:59:57","modified_gmt":"2021-10-27T20:59:57","slug":"seismic-dilatometer-test-sdmt","status":"publish","type":"page","link":"https:\/\/globalgeotech.co.uk\/index.php\/seismic-dilatometer-test-sdmt\/","title":{"rendered":"Seismic Dilatometer Test (SDMT)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1963\" class=\"elementor elementor-1963\">\n\t\t\t\t\t\t\t\t\t<section data-particle_enable=\"false\" data-particle-mobile-disabled=\"false\" class=\"ob-is-breaking-bad elementor-section elementor-top-section elementor-element elementor-element-20efe9d8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"20efe9d8\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;_ob_bbad_use_it&quot;:&quot;yes&quot;,&quot;_ob_bbad_sssic_use&quot;:&quot;no&quot;,&quot;_ob_glider_is_slider&quot;:&quot;no&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6aa40360\" data-id=\"6aa40360\" data-element_type=\"column\" data-settings=\"{&quot;_ob_bbad_is_stalker&quot;:&quot;no&quot;,&quot;_ob_teleporter_use&quot;:false,&quot;_ob_column_hoveranimator&quot;:&quot;no&quot;,&quot;_ob_column_has_pseudo&quot;:&quot;no&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section data-particle_enable=\"false\" data-particle-mobile-disabled=\"false\" class=\"ob-is-breaking-bad elementor-section elementor-top-section elementor-element elementor-element-79c0e7a9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"79c0e7a9\" data-element_type=\"section\" data-settings=\"{&quot;_ob_bbad_use_it&quot;:&quot;yes&quot;,&quot;_ob_bbad_sssic_use&quot;:&quot;no&quot;,&quot;_ob_glider_is_slider&quot;:&quot;no&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-112fc7d5\" data-id=\"112fc7d5\" data-element_type=\"column\" data-settings=\"{&quot;_ob_bbad_is_stalker&quot;:&quot;no&quot;,&quot;_ob_teleporter_use&quot;:false,&quot;_ob_column_hoveranimator&quot;:&quot;no&quot;,&quot;_ob_column_has_pseudo&quot;:&quot;no&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7f2b30b6 ob-harakiri-inherit elementor-widget elementor-widget-heading\" data-id=\"7f2b30b6\" data-element_type=\"widget\" data-settings=\"{&quot;_ob_harakiri_writing_mode&quot;:&quot;inherit&quot;,&quot;_ob_perspektive_use&quot;:&quot;no&quot;,&quot;_ob_shadough_use&quot;:&quot;no&quot;,&quot;_ob_allow_hoveranimator&quot;:&quot;no&quot;,&quot;_ob_widget_stalker_use&quot;:&quot;no&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.6.3 - 12-04-2022 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h2 class=\"elementor-heading-title elementor-size-default\">Seismic Dilatometer Test (SDMT)\n<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4af92869 ob-harakiri-inherit elementor-widget elementor-widget-text-editor\" data-id=\"4af92869\" data-element_type=\"widget\" data-settings=\"{&quot;_ob_harakiri_writing_mode&quot;:&quot;inherit&quot;,&quot;_ob_perspektive_use&quot;:&quot;no&quot;,&quot;_ob_shadough_use&quot;:&quot;no&quot;,&quot;_ob_allow_hoveranimator&quot;:&quot;no&quot;,&quot;_ob_widget_stalker_use&quot;:&quot;no&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.6.3 - 12-04-2022 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#818a91;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#818a91;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>SDMT\u00a0 is a combination of the standard Flat Dilatometer (DMT) with a seismic module. The seismic module is a tubular element placed above the DMT blade, equipped with two receivers located 0.5 m apart. When a shear wave is generated at the surface, it reaches first the upper receiver, then, after a delay, the lower receiver. The seismograms acquired by the two receivers, amplified and digitized at depth, are transmitted to a PC at the surface, which is\u00a0 used to measure the shear wave velocity\u00a0<i>V<sub>s<\/sub><\/i>. From\u00a0<i>V<sub>s<\/sub><\/i>\u00a0one can determine the small strain shear modulus\u00a0<i>G<sub>0<\/sub><\/i><\/p><p><img decoding=\"async\" src=\"https:\/\/www.globalgeotech.co.uk\/editorimages\/images\/SDMT%20setup.jpg\" alt=\"SDMT set up and procedure\" \/><br \/><i>(a) DMT blade and seismic module; (b) Schematic layout of the seismic dilatometer test; (c) Example of seismograms as recorded and re-phased.<\/i><br \/><br \/><strong>Applications of SDMT<\/strong><br \/>The modern norms increasingly require seismic analysis, for which the basic parameter is\u00a0<i>V<sub>s<\/sub><\/i>\u00a0. SDMT provides profiles of Vs in a quick, precise, simple and economical way. Repeatability of measured Vs\u00a0 is 1-2 % (see below).<\/p><p>According to Eurocode 8 all new constructions should be preceded by an analysis of the local seismic response, requiring Vs\u00a0 from ground surface to 30 m depth.<\/p><p>SDMT provides, besides\u00a0<i>V<sub>s<\/sub><\/i>\u00a0, all the information obtained by traditional DMT.\u00a0 In particular, SDMT provides at each depth two independent estimates of the liquefaction resistance, one derived from\u00a0<i>V<sub>s<\/sub><\/i>\u00a0and the other from\u00a0<i>K<sub>d<\/sub><\/i>.\u00a0\u00a0\u00a0<i>K<sub>d<\/sub><\/i>\u00a0is sensitive to factors almost unfelt by other tests, in particular, ageing, a factor that may increase liquefaction resistance by as much as 60% in loose sands.<\/p><p>SDMT is used worldwide. Important projects include barriers for protecting Venice, Barcelona harbour and airport, the new shuttle crawlerway at NASA Cape Kennedy, the San Andreas fault, big power plants and high speed railways etc.<\/p><p><img decoding=\"async\" src=\"https:\/\/www.globalgeotech.co.uk\/editorimages\/images\/SDMT%20Repeatability.gif\" alt=\"Repeatability of SDMT Soundings\" \/><\/p><p><em>Results from two nearby SDMTs showing high repeatability.<\/em><br \/>\u00a0<\/p><p>Further information on the SDMT can be downloaded by clicking on the link here:\u00a0<a href=\"https:\/\/www.globalgeotech.co.uk\/editorimages\/files\/marchetti%20s.%202014%20igc%20india.pdf\">The Seismic Dilatometer for In Situ Soil Investigations<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Seismic Dilatometer Test (SDMT) SDMT\u00a0 is a combination of the standard Flat Dilatometer (DMT) with a seismic module. The seismic module is a tubular element placed above the DMT blade, equipped with two receivers located 0.5 m apart. When a shear wave is generated at the surface, it reaches first the upper receiver, then, after &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/globalgeotech.co.uk\/index.php\/seismic-dilatometer-test-sdmt\/\"> <span class=\"screen-reader-text\">Seismic Dilatometer Test (SDMT)<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Seismic Dilatometer Test (SDMT) - Global Geotech<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/globalgeotech.co.uk\/index.php\/seismic-dilatometer-test-sdmt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Seismic Dilatometer Test (SDMT) - Global Geotech\" \/>\n<meta property=\"og:description\" content=\"Seismic Dilatometer Test (SDMT) SDMT\u00a0 is a combination of the standard Flat Dilatometer (DMT) with a seismic module. The seismic module is a tubular element placed above the DMT blade, equipped with two receivers located 0.5 m apart. 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