Geri Dön

Air injection technique to mitigate liquefaction beneath shallow foundations

Başlık çevirisi mevcut değil.

PDF İndir

  1. Tez No: 403393
  2. Yazar: ABDÜLHAKİM ZEYBEK
  3. Danışmanlar: Prof. GOPAL MADABHUSHI
  4. Tez Türü: Doktora
  5. Konular: Deprem Mühendisliği, Earthquake Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2017
  8. Dil: İngilizce
  9. Üniversite: University of Cambridge
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 243

Özet

Özet yok.

Özet (Çeviri)

Historical and recent earthquakes often remind the need for taking precautions against earthquake-induced liquefaction damage that structures on shallow foundations can suffer. Air injection technique has the potential to improve the soil supporting new and existing structures. There is, however, little research on its application and performance beneath existing shallow foundations. The aim of this research was to provide a comprehensive view of the air injection technique by conducting well-controlled dynamic centrifuge and 1-g shaking table tests, along with static soil column experiments in the laboratory. Detailed analysis of the test results highlighted that air injection was an effective way of minimising the soil-softening and loss of shear stiffness associated with earthquake-induced liquefaction. A decreasing trend in the magnitude of excess pore pressures and foundation settlements was observed with decreasing degree of saturation. Air injection technique was also found to perform better under increased confining stresses. Injecting air in a controlled manner (e.g. applying low air injection rate and pressure) was shown to be crucial for the safety of foundations. A wider and more uniformly desaturated zone was achieved with increasing air injection pressure, but which concurrently increased the settlements that shallow foundations experienced. It was also found that most of the air could remain entrapped in partially saturated soil under different simulated field conditions for a long period of time, which indicated the long-term reliability of the mitigation accomplished. Particle image velocimetry was utilised to identify deformation mechanisms that develop underneath and in the ground surrounding shallow foundations. It was shown that foundations resting on saturated soil settled excessively. Foundation settlements were predominantly driven by deviatoric strains, and a bearing capacity failure mechanism did form. When air was injected into saturated soil, air reduced the build-up of excess pore pressures as it contracted during dynamic loading but increased soil compressibility. Deviatoric strain-induced deformations significantly reduced, which resulted in much smaller settlements. The observed settlements were principally caused by volumetric strains that arose from increased soil compressibility. Given the depth of liquefaction reduced significantly for air-injected partially saturated soil, a complete bearing capacity failure mechanism could not occur. The lower the degree of saturation, the shallower and more localised the deformations were observed.

Benzer Tezler

  1. Tez No

    441720

    Tarihi yapıların deprem performansı ve güçlendirme teknikleri

    Structural performance of historical masonry building and techniques of strengthening

    TUĞÇE TETİK

    Yüksek Lisans

    Türkçe

    Türkçe

    2015

    Deprem Mühendisliğiİstanbul Teknik Üniversitesi

    İnşaat Mühendisliği Ana Bilim Dalı

    PROF. DR. ZEKAİ CELEP

  2. Tez No

    866432

    Green extraction and encapsulation of black rosehip polyphenols: İn vitro bioaccessibility, bioavailability, and biological activities

    Siyah kuşburnu polifenollerinin yeşil ekstraksiyonu ve enkapsülasyonu: İn vitro biyoerişilebilirlik, biyoyararlılık, ve biyolojik aktiviteleri

    KADRİYE NUR KASAPOĞLU

    Doktora

    İngilizce

    İngilizce

    2022

    Gıda Mühendisliğiİstanbul Teknik Üniversitesi

    Gıda Mühendisliği Ana Bilim Dalı

    PROF. DR. BERAAT ÖZÇELİK

  3. Tez No

    708863

    Development of combustion tube experimental setup for underground coal gasification

    Yer altı kömür gazlaştırması için yanma tüpü deney düzeneği geliştirilmesi

    İSMAİL HAKKI SARIÇAM

    Yüksek Lisans

    İngilizce

    İngilizce

    2021

    Petrol ve Doğal Gaz Mühendisliğiİstanbul Teknik Üniversitesi

    Petrol ve Doğal Gaz Mühendisliği Ana Bilim Dalı

    DOÇ. DR. MURAT ÇINAR

  4. Tez No

    553885

    Ameliyathane havalandırma sistemi tasarımı ve HAD yöntemi ile hava akış analizi

    Air conditioning system designing of an operating room and air flow analysis using the CFD technique

    MUHAMMED GALİP ÖZER

    Yüksek Lisans

    Türkçe

    Türkçe

    2019

    Makine Mühendisliğiİstanbul Teknik Üniversitesi

    Makine Mühendisliği Ana Bilim Dalı

    PROF. DR. LÜTFULLAH KUDDUSİ

  5. Tez No

    631954

    Deksketoprofen trometamol'ün tavuk embriyolarında tibia gelişimine etkisi

    The effect of dexketoprofen trometamol on the development of tibia in chicken embryos specialization thesis

    MUHAMMED YILDIZ

    Tıpta Uzmanlık

    Türkçe

    Türkçe

    2020

    Ortopedi ve TravmatolojiKahramanmaraş Sütçü İmam Üniversitesi

    Ortopedi ve Travmatoloji Ana Bilim Dalı

    DR. ÖĞR. ÜYESİ BÜLENT GÜNERİ

Geri Dön