{"id":48,"date":"2024-03-30T12:08:42","date_gmt":"2024-03-30T12:08:42","guid":{"rendered":"http:\/\/localhost\/blog\/?p=48"},"modified":"2024-07-16T07:09:33","modified_gmt":"2024-07-16T07:09:33","slug":"seismic-tomography-between-exploratory-drifts-for-dam-projects","status":"publish","type":"post","link":"https:\/\/www.parsan.biz\/blog\/seismic-tomography-between-exploratory-drifts-for-dam-projects\/","title":{"rendered":"Seismic Tomography Between Exploratory Drifts For Dam Projects"},"content":{"rendered":"\n<p class=\"has-text-align-center\"><strong>Dr. Sanjay Rana, Ashutosh Kaushik, Bhaskar Chendhoor (PARSAN Overseas Pvt Limited)<br>sanjay@parsan.biz <\/strong><\/p>\n\n\n\n<p><strong>About Parsan<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An ISO 9001:2015 certified geophysical company<\/li>\n\n\n\n<li>Promoters recognized as leaders in region for launching new technology. Responsible for launch of:\n<ul class=\"wp-block-list\">\n<li>Ground Penetrating Radar Technology- 1996<\/li>\n\n\n\n<li>Shear Wave Seismic Refraction- 1997<\/li>\n\n\n\n<li>High Resolution Seismic Tomography- 1998<\/li>\n\n\n\n<li>Passive Seismic Tomography for Oil Exploration- 2008<\/li>\n\n\n\n<li>Innovative use of geophysical methods for high resolution non-destructive testing of dams- 1998<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Highly experienced and trained staff.<\/li>\n\n\n\n<li>Offices in Delhi, Kolkata, Bhopal, Bahrain, Saudi Arabia, Singapore<\/li>\n\n\n\n<li>Work experience in India, Nepal, Bhutan, Saudi Arabia, Bahrain, Kuwait, Oman, Afghanistan, Singapore, Greece, Iran, Algeria, Georgia&#8230;<\/li>\n<\/ul>\n\n\n\n<p><strong>About Speaker (Dr. Sanjay Rana)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Professional Geophysicist, with 32 years of work experience. Chairman AF Academy &amp; Managing Director, PARSAN, An engineering geophysics company<\/li>\n\n\n\n<li>Gold Medalist- 1990, University of Roorkee (Now IIT-Roorkee)<\/li>\n\n\n\n<li>Pioneered use of Near Surface Geophysics (Private Sector) in India in 1995.<\/li>\n\n\n\n<li>Pioneered use of Dam Geophysics in India in 1998.<\/li>\n\n\n\n<li>Successfully used integrated geophysical approach for investigations across flowing rivers &amp; for dam safety<\/li>\n\n\n\n<li>Completed geophysical investigations of 72 hydro power projects.<\/li>\n\n\n\n<li>Member of various working committees for development of Code of Practices and Standards, including BIS, IRC.<\/li>\n\n\n\n<li>Principal author of:\n<ul class=\"wp-block-list\">\n<li>Guidelines on Geophysical Investigation of Dams<\/li>\n\n\n\n<li>Guidelines for Geophysical Investigation of Tunnels (TAI)<\/li>\n\n\n\n<li>Guideline for Geophysical Investigations for Bridges (IRC)<\/li>\n\n\n\n<li>Indian Code for Subsurface Utility Mapping.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"617\" height=\"651\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sir-mv.png\" alt=\"\" class=\"wp-image-49\" style=\"width:327px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p class=\"has-text-align-center\">The Engineers first problem in any design situation is to discover what the problem really is. &nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"782\" height=\"467\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/parsan-cartoon.jpeg\" alt=\"\" class=\"wp-image-50\" style=\"width:635px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p><strong>Difficult Ground Conditions?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1) Expertise &amp; engineering solutions available for dealing with any (almost) ground condition<\/li>\n\n\n\n<li>2) The problem is meeting the unexpected and uncertainty of ground conditions<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1065\" height=\"143\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/heading.png\" alt=\"\" class=\"wp-image-51\" style=\"width:849px;height:auto\"\/><\/figure>\n\n\n\n<p><strong>Geophysical Investigation for Dam Sites&#8230;<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Study available geological maps<\/li>\n\n\n\n<li>Geological Mapping<\/li>\n\n\n\n<li>Geophysical Investigations<\/li>\n\n\n\n<li>Drilling (with geophysical logging)<\/li>\n\n\n\n<li>Slope stability analysis<\/li>\n\n\n\n<li>Hydrogeological studies<\/li>\n\n\n\n<li>Seismicity Study<\/li>\n\n\n\n<li>Burrow Areas<\/li>\n<\/ul>\n\n\n\n<p><strong>Necessary Investigation Steps&#8230;<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Different types of geophysical studies should be performed in the dam site and reservoir area to indicate the following data:<\/li>\n\n\n\n<li>To indicate groundwater level.<\/li>\n\n\n\n<li>To indicate the mechanical properties of the rocks and the depth of the weathering zone.<\/li>\n\n\n\n<li>To detect faults\/ fractures\/ shear zones\/ weak zones<\/li>\n\n\n\n<li>To investigate burrow areas<\/li>\n\n\n\n<li>To conduct slope stability studies<\/li>\n\n\n\n<li>To determine shear wave velocities for seismic hazard studies<\/li>\n<\/ul>\n\n\n\n<p><strong>Dam Site Investigations &#8211; Advanced Geophysics&#8230;.<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Seismic Refraction Tomography- bed rock profile, fault\/ fracture\/ shear zones.<\/li>\n\n\n\n<li>Resistivity Imaging- detailed subsurface images even in velocity inversion zones<\/li>\n\n\n\n<li>ReMi\/ MASW- Shear wave profile from surface surveys, without any boreholes<\/li>\n\n\n\n<li>Crosshole\/ uphole\/ downhole surveys- P&amp;S wave velocities for detailed analysis of various layers and dynamic moduli.<\/li>\n\n\n\n<li>Crosshole\/ uphole\/ downhole surveys- P&amp;S wave velocities for detailed analysis of various layers and dynamic moduli.<\/li>\n\n\n\n<li>Seismic Reflection- tunnel route investigation<\/li>\n\n\n\n<li>Electrical Resistivity- Earth Grid Design<\/li>\n<\/ul>\n\n\n\n<p><strong>Dam Site Investigations- Advanced Geophysics&#8230;.<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Seismic Refraction Tomography- bed rock profile, fault\/ fracture\/ shear zones.<\/li>\n\n\n\n<li>Resistivity Imaging- detailed subsurface images even in velocity inversion zones<\/li>\n\n\n\n<li>ReMi\/ MASW- Shear wave profile from surface surveys, without any boreholes<\/li>\n\n\n\n<li>Crosshole\/ uphole\/ downhole surveys- P&amp;S wave velocities for detailed analysis of various layers and dynamic moduli.<\/li>\n\n\n\n<li>Crosshole\/ uphole\/ downhole surveys- P&amp;S wave velocities for detailed analysis of various layers and dynamic moduli.<\/li>\n\n\n\n<li>Seismic Reflection- tunnel route investigation<\/li>\n\n\n\n<li>Electrical Resistivity- Earth Grid Design<\/li>\n<\/ul>\n\n\n\n<p><strong>Limitations &amp; Reasons for Failures?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wrong tool selection<\/li>\n\n\n\n<li>Method lacking desired resolution<\/li>\n\n\n\n<li>Geology ignored<\/li>\n\n\n\n<li>Calibration ignored<\/li>\n\n\n\n<li>Only single tool used<\/li>\n\n\n\n<li>Wrong initial model<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1500\" height=\"280\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/heading4.jpg\" alt=\"\" class=\"wp-image-52\" style=\"width:841px;height:auto\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><strong>Understanding Tomography&#8230;<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"753\" height=\"733\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/row1-1.jpg\" alt=\"\" class=\"wp-image-53\" style=\"width:616px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"932\" height=\"524\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-1.jpg\" alt=\"\" class=\"wp-image-54\" style=\"width:840px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"930\" height=\"524\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-2.jpg\" alt=\"\" class=\"wp-image-55\" style=\"width:641px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"928\" height=\"524\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-3.jpg\" alt=\"\" class=\"wp-image-56\" style=\"width:678px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"930\" height=\"524\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-4.jpg\" alt=\"\" class=\"wp-image-57\" style=\"width:840px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"930\" height=\"522\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-5.jpg\" alt=\"\" class=\"wp-image-58\" style=\"width:840px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"931\" height=\"524\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-6.jpg\" alt=\"\" class=\"wp-image-59\" style=\"width:840px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"932\" height=\"522\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-7.jpg\" alt=\"\" class=\"wp-image-62\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"928\" height=\"521\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-8.jpg\" alt=\"\" class=\"wp-image-63\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"930\" height=\"521\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-9.jpg\" alt=\"\" class=\"wp-image-64\" style=\"width:840px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"928\" height=\"522\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-10.jpg\" alt=\"\" class=\"wp-image-65\" style=\"width:840px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"929\" height=\"523\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-11.jpg\" alt=\"\" class=\"wp-image-66\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"929\" height=\"523\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-12.jpg\" alt=\"\" class=\"wp-image-68\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"929\" height=\"522\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-13.jpg\" alt=\"\" class=\"wp-image-70\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"930\" height=\"522\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-14.jpg\" alt=\"\" class=\"wp-image-71\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"927\" height=\"519\" src=\"https:\/\/www.parsan.biz\/blog\/wp-content\/uploads\/2024\/03\/sesmic-image-15.jpg\" alt=\"\" class=\"wp-image-72\"\/><\/figure>\n\n\n\n<p><strong>Conclusion:<\/strong><\/p>\n\n\n\n<p>&nbsp;Geological investigations and site characterization by making drifts has been a standard procedure for large dams. This provides very valuable information about dam site. Making drifts is a time consuming and expensive activity. To gain more advantage and cover more area, conducting seismic tomography between drifts is a cost-effective option.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dr. Sanjay Rana, Ashutosh Kaushik, Bhaskar Chendhoor (PARSAN Overseas Pvt Limited)sanjay@parsan.biz About Parsan About Speaker (Dr. Sanjay Rana) The Engineers first problem in any design situation is to discover what the problem really is. &nbsp; Difficult Ground Conditions? Geophysical Investigation for Dam Sites&#8230; Necessary Investigation Steps&#8230; Dam Site Investigations &#8211; Advanced Geophysics&#8230;. Dam Site Investigations- [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":73,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-48","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dr-sanjay-rana"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/posts\/48","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/comments?post=48"}],"version-history":[{"count":17,"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/posts\/48\/revisions"}],"predecessor-version":[{"id":428,"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/posts\/48\/revisions\/428"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/media\/73"}],"wp:attachment":[{"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/media?parent=48"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/categories?post=48"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.parsan.biz\/blog\/wp-json\/wp\/v2\/tags?post=48"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}