{"id":8481,"date":"2020-07-21T14:16:06","date_gmt":"2020-07-21T04:16:06","guid":{"rendered":"https:\/\/sigra.com.au\/?page_id=8481"},"modified":"2022-02-15T12:05:30","modified_gmt":"2022-02-15T02:05:30","slug":"hydrostatic-testing","status":"publish","type":"page","link":"https:\/\/sigra.com.au\/sigra-services\/geotechnical-engineering-geomechanics\/rock\/rock-properties-testing\/hydrostatic-testing\/","title":{"rendered":"Hydrostatic Testing"},"content":{"rendered":"<p>[vc_row][vc_column width=&#8221;4\/5&#8243;][vc_column_text]<strong>Hydrostatic Testing for Moduli (<em>E<sub>i<\/sub><\/em><\/strong><strong>) <\/strong><\/p>\n<p>This test is used to determine the relative stiffness of rock fragments or core in three axes. The test involves fitting the rock sample with three strain gauge rosettes. It is then cast in silicone and is hydrostatically loaded. The analysis is based on the assumption that one of these axes is in the direction of a principal value of Young\u2019s modulus and that the core behaves in an orthotropic manner. The analysis cannot on its own be used to determine absolute values of Young\u2019s moduli and Poisson\u2019s ratios, as these cannot be separated. If a value of Poisson\u2019s ratio can be estimated then the values of Young\u2019s moduli can be calculated. Where the hydrostatic test is used in combination with uniaxial testing, so that the value of the Axial Young\u2019s modulus is measured, the other moduli and the values of Poisson\u2019s ratios can be determined. Where the core is non-linear or exhibits high Poisson\u2019s ratios, the analysis becomes complex and uncertain. The test method is particularly useful to evaluate the moduli of rock fragments or odd shaped samples such as hollow overcore samples. In the latter case the sample is also uniaxially tested.[\/vc_column_text][vc_gallery images=&#8221;10016,10014,10015&#8243; img_size=&#8221;medium&#8221;][vc_column_text]<a href=\"https:\/\/sigra.com.au\/wp-content\/uploads\/2021\/10\/aveE-vs-stress-0019.066.png\"><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-10017 aligncenter\" src=\"https:\/\/sigra.com.au\/wp-content\/uploads\/2021\/10\/aveE-vs-stress-0019.066.png\" alt=\"\" width=\"640\" height=\"480\" srcset=\"https:\/\/sigra.com.au\/wp-content\/uploads\/2021\/10\/aveE-vs-stress-0019.066.png 640w, https:\/\/sigra.com.au\/wp-content\/uploads\/2021\/10\/aveE-vs-stress-0019.066-300x225.png 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/a>[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/5&#8243;][stm_sidebar sidebar=&#8221;9714&#8243;][vc_separator color=&#8221;custom&#8221; accent_color=&#8221;#002d58&#8243;][stm_sidebar sidebar=&#8221;9720&#8243;][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column width=&#8221;4\/5&#8243;][vc_column_text]Hydrostatic Testing for Moduli (Ei) This test is used to determine the relative stiffness of rock fragments or core in three axes. The test involves fitting the rock sample with three strain gauge rosettes. It is then cast in silicone and is hydrostatically loaded. The analysis is based on the assumption that one of<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":8393,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_mi_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hydrostatic Testing - Sigra<\/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:\/\/sigra.com.au\/sigra-services\/geotechnical-engineering-geomechanics\/rock\/rock-properties-testing\/hydrostatic-testing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hydrostatic Testing - Sigra\" \/>\n<meta property=\"og:description\" content=\"[vc_row][vc_column width=&#8221;4\/5&#8243;][vc_column_text]Hydrostatic Testing for Moduli (Ei) This test is used to determine the relative stiffness of rock fragments or core in three axes. 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