{"id":19329,"date":"2016-01-28T18:27:18","date_gmt":"2016-01-28T16:27:18","guid":{"rendered":"https:\/\/www.geostru.eu\/?p=19329"},"modified":"2017-11-09T08:40:37","modified_gmt":"2017-11-09T06:40:37","slug":"determination-of-geotechnical-characteristic-parameters","status":"publish","type":"post","link":"https:\/\/www.geostru.eu\/en\/blog\/2016\/01\/28\/determination-of-geotechnical-characteristic-parameters\/","title":{"rendered":"Determination of geotechnical characteristic parameters"},"content":{"rendered":"

The article “Determination of geotechnical characteristic parameters<\/em>” follows the base principles of the Eurocode.<\/strong><\/p>\n

\u201cThe characteristic value of a geotechnical parameter shall be selected as a cautious estimate of the value affecting the occurrence of the limit state.\u201d
\n[EC7- 2.4.5.2 2(P)]<\/em><\/p>\n

Defining the geotechnical characteristic value<\/strong> means therefore to choose the geotechnical parameter that influences the behavior of the soil in that particular limit state and adopt a value, or an estimate, in favour of safety.<\/p>\n

If statistical methods are used, the characteristic value should be derived such that the calculated probability of a worse value governing the occurrence of the limit state under consideration is not greater than 5%.<\/p>\n

Assuming, for exmple, a characteristic value of 26\u00b0 for the soil friction angle with a 5% fractile<\/em>, means to hypothesize that there is a probability of five percent that the real value of the friction angle is less that 26\u00b0.<\/p><\/blockquote>\n

A cautios estimate of the geotechnical parameters is obtained through the following formula:<\/p>\n

\"1_cvsoil\"
\nwhere, for a normal distribuiton, for compensation of resistances (slope stability analysis, bearing capacity of shallow foundations<\/em>)<\/p>\n

\"2_cvsoil\"<\/p>\n

in absence of resistance compensation (plinths, bearing capacity of deep foundations<\/em>)<\/p>\n

\"3_cvsoil\"<\/p>\n

In the case of\u00a0resistances compensation<\/strong> the characteristic value of the geotechnical parameter is close to the mean value.\u00a0\u00a0<\/strong><\/p>\n

\"\"<\/p>\n

In\u00a0absence of resistances compensation<\/strong> the characteristic value is close to the minimum value.<\/p>\n

\"5_cvsoil\"<\/p>\n

PRACTICAL CASE<\/strong>
\nIt was performed a continous mechanic penetration test to a depth of 6.8 meters from ground level. The test was processed with the software Dynamic Probing<\/a>, obtaining the values for the angle of shearing resistance shown in the table below:<\/p>\n

\"\"<\/p><\/blockquote>\n

According to the indications reported in the literature, the angle of shearing resistance does not follow the normal statistical distribution, but its tangent xi=tan(fi), so we transform the angles in tangent:<\/p>\n

\"\"<\/p><\/blockquote>\n

Mean value m(xi)= 0,547799;
\nStandard deviation s(xi)=0,009417<\/p>\n

For compensated resistances
\n<\/strong>The value of the distributed parameter is calculated as:
\nxi=0,547799-1.645*0,009417\/root(34)=0.54518<\/strong>, with the transformation in angle, arctg(0,54518) we obtain 28.6\u00b0<\/strong><\/p>\n

For not compensated resistances
\n<\/strong>The characteristic value of the distributed parameter can be calculated as:
\nxi=0,547799-1.645*0,009417=0,532307, trasformed in angle arctg(0,532307)=28.0\u00b0
\n<\/strong><\/p>\n

In this case (large sample)<\/em> the difference between the obtained values is minimal, but the difference may become substantial for small samples (n<30)\u00a0<\/em>as in the majority of cases and for some geotechnical parameters, such as cohesion, which distributes its statistical value according to a logarithmic law.<\/p>\n

The software CVSOIL<\/a><\/strong> offers the possibility to analyze: numerous<\/span> samples<\/span>, dispersed<\/span> samples<\/span>, highly dispersed saples<\/span>, linear distribution<\/span>, tangent<\/span>, logarithmic <\/span><\/span>etc.
\nCVSOIL<\/a><\/strong> simplifies the user’s work allowing to automatically acquire the data to estimate from Excel, memory or directly from the software Static Probing<\/a> and\u00a0 Dynamic Probing<\/a>.<\/p>\n

In this short video you can see how data is beeing processed in\u00a0CVSOIL<\/a><\/strong><\/p>\n

\n

<\/p>\n

The estimation of the characteristic value of the geotechnical parameters is very variable especially when the samples are highly dispersed. CVSOIL<\/a> has the statistical models that follow the principles of the Eurocodes<\/a> and which allow to make an accurate estimate of the characteristic value of the analyzed parameter even in the case of very dispersed samples.<\/p>\n","protected":false},"excerpt":{"rendered":"

The article “Determination of geotechnical characteristic parameters” follows the base principles of the Eurocode. \u201cThe characteristic value of a geotechnical parameter shall be selected as a cautious estimate of the value affecting the occurrence of the limit state.\u201d [EC7- 2.4.5.2 2(P)] Defining the geotechnical characteristic value means therefore to choose the geotechnical parameter that influences…<\/p>\n","protected":false},"author":216,"featured_media":19301,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[218,597,216],"tags":[371],"class_list":["post-19329","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-geotechnical-articles","category-scientific-publications-for-civil-engineering-geology","category-varie-en","tag-geotechnical-characteristic-parameters","category-218","category-597","category-216","description-off"],"yoast_head":"\nDetermination of geotechnical characteristic parameters - 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Since 2016 he works as analyst, software developer, consultant for insourcing (SC ENGSOFT) and outsourcig activities for important international companies, in the European Silicon Valley, Cluj Napoca.","sameAs":["http:\/\/www.geostru.eu"],"url":"https:\/\/www.geostru.eu\/en\/blog\/author\/filippo-catanzariti\/"}]}},"_links":{"self":[{"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/posts\/19329"}],"collection":[{"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/users\/216"}],"replies":[{"embeddable":true,"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/comments?post=19329"}],"version-history":[{"count":0,"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/posts\/19329\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/media\/19301"}],"wp:attachment":[{"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/media?parent=19329"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/categories?post=19329"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.geostru.eu\/en\/wp-json\/wp\/v2\/tags?post=19329"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}