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Article
Settlement and Collapse of Gypseous Soils

Authors: Ahmed A. H. Al-Obaidi --- Ibtihal H. S. Al-Mafragei
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2016 Volume: 23 Issue: 1 Pages: 20-31
Publisher: Tikrit University جامعة تكريت

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Abstract

The work in this research presents an experimental, theoretical and field study in order to investigate the settlement of Gypseous soils and the effect of water percolation on collapsibility of this soil. In this research, more than five sites where chosen to extract the gypseous soil samples with different gypsum content; the sites located in different regions in Salah Aldeen Governorate. In order to estimate the settlement and collapse of gypseous soils, field tests consist of standard penetration test for depths (1m to 5m) for each site and plate load test were conducted in dry and soaked cases.The results show that the settlement of gypseous soils in dry condition is less than the same soils that have low values of gypsum in its formation, the settlement value of lightly gypseous soils can be evaluated from the basic equations depending on data of SPT.In soaking case with short term flooding, gypseous soils shows compressible and they are sufficiently reliable soil base, while in the case of long term flooding settlement develops due to dissolution of salts and gypsum. The magnitude and the rate of the settlement depend on initial gypsum content, relative amount of leached salts, the mineralogy and type of soil and soil properties and acting load. The standard penetration test does not use in calculating the settlement for the soils that have gypsum in its formation in soaking condition.

Keywords

Gypseous soils --- Settlement --- Collapsibility --- SPT --- PLT


Article
Application of Dynamic Cone Penetration Test to Gypseous Soils
تطبيقات فحص اختراق المخروط الديناميكي في الترب الجبسية

Authors: Ahmed A. H. Al-Obaidi --- Qudama A. A. Al-Ashoishi
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2018 Volume: 25 Issue: 4 Pages: 1-5
Publisher: Tikrit University جامعة تكريت

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Abstract

Dynamic cone penetration test (DCPT) is a fast, economical and easy to conduct. It is widely used to assess the strength of natural and compacted soils. The device is introduced in the 1950s. However, it was newly introduced in Iraq. This study aims to evaluate the potentials of DCP in geotechnical explorations in the gypseoussoil since it covers a large area of the country and to obtain correlations with the California bearing ratios (CBR) and investigating the effect of gypsum on the CBRDCP relationship. Field and Laboratory tests were conducted on soil sample retrieved from six sites with different gypsum contents (28-41) %. Laboratory testsinclude performing CBR and DCP tests in a cylindrical mold. A statistical analysis of the results shows that gypsum content is an affecting factor on DCP and good CBR-DCP correlations on gypsum content were obtained.

فحص اختراق المخروط الديناميكي هو فحص سريع، اقتصادي ويمكن اجراءه بسهولة. يستخدم هذا الفحص بشكل واسع لتقييم مقاومة الترب الطبيعية والمحدولة. على الرغم من ان هذا الفحص تم استحداثه في الخمسينيات اال انه لم يستخدم في العراق اال حديثا. تهدف هذه الدراسة الى تقييم إمكانات هذا الفحص في التحريات الحقلية للتربة الجبسية حيث انها تغطي مساحات شاسعة من البلد، وكذلك تهدف الى الحصول على عالقات ترابطية مع فحص )نسبة التحمل الكاليفورني( وكذلك استكشاف تأثير نسبة الجبس على هذه العالقة. تم اجراء فحوصات حقلية ومختبرية على عينات من 6 مواقع بنسب جبس تتراوح من (28-41 %) وباستخدام قوالب فحص اسطوانية. أظهر التحليل االحصائي للنتائج ان هناك تأثير لنسبة الجبس على نتائج فحص اختراق المخروط الديناميكي وتم الحصول على عالقات تربط بين نتائج الفحصين باالستناد على نسبة للجبس.

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