Shaking Table Testing Of Cyclic Behaviour Of Fine Grained Soils Undergoing Cementation
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Shaking Table Testing Of Cyclic Behaviour Of Fine Grained Soils Undergoing Cementation
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Author : Imad Hazim Alainachi
language : en
Publisher:
Release Date : 2020
Shaking Table Testing Of Cyclic Behaviour Of Fine Grained Soils Undergoing Cementation written by Imad Hazim Alainachi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Cemented paste backfill (CPB) is a novel technology developed in the past few decades to better manage mining wastes (such as tailings) in environmentally friendly way. It has received prominent interest in the mining industry around the world. In this technology, up to 60% of the total amount of tailings is reused and converted into cemented construction material that can be used for secondary support in underground mine openings (stopes) and to maximize the recovery of ore from pillars. CPB is an engineered mixture of tailings, water, and hydraulic binder (such as cement), that is mixed in the paste plant and delivered into the mine stopes either by gravity or pumping. During and after placing it into the mine stopes, the performance of CPB mainly depends on the role of the hydraulic binder, which increases the mechanical strength of the mixture through the process of cement hydration. Similar to other fine-grained soils undergoing cementations, CPB's behavior is affected by several conditions or factors, such as cement hydration progress (curing time), chemistry of pore water, mixing and curing temperature, and filling strategy. Also, it has been found that fresh CPB placed in the mine stopes can be susceptible to many geotechnical issues, such as liquefaction under ground shaking conditions. Liquefaction-induced failure of CPB structure may cause injuries and fatalities, as well as significant environmental and economic damages. Many researches studied the effect of the aforementioned conditions on the static mechanical behavior of CPB. Other researches have evaluated the liquefaction behavior of natural soils and tailings (without cement) during cyclic loadings using shaking table test technique. Only few studies investigated the CPB liquefaction during dynamic loading events using the triaxial tests. Yet, there are currently no studies that addressed the liquefaction behavior of CPB under the previous conditions by using the shaking table technique. In this Ph.D. study, a series of shaking table tests were conducted on fresh CPB samples (75 cm × 75 cm ×70 cm), which were mixed and poured into a flexible laminar shear box (that was designed and build for the purpose of this research). Some of these shaking table tests were performed at different maturity ages of 2.5 hrs, 4.0 hrs, and 10.0 hrs, to investigate the effect of cement hydration progress on the liquefaction potential of CPB. Another set of tests were conducted to assess the effect of the chemistry (sulphate content) of the pore-water on the cyclic response of fresh CPB by exposing cyclic loads on couple of CPB models that contain different concertation of sulphate ions of 0.0 ppm and 5000 ppm. Moreover, as part of this study, series of shaking table test was conducted on CPB samples that were prepared and cured at different temperatures of 20oC and 35oC, to evaluate the effect of temperature of the cyclic behavior of CPB. Furthermore, the effect of filling strategy on the cyclic behavior of fresh CPB was assessed by conducting set of shaking tables tests on CPB models that were prepared at different filling strategies of continuous filling, and sequential or discontinuous (layered) filling. The results obtained show that CPB has different cyclic behavior and performance under these different conditions. It is observed that the progress of cement hydration (longer curing time) enhances the liquefaction resistance of CPB, while the presence of sulphate ions diminishes it. It is also found that CPB mixed and cured in low temperature is more prone to liquefaction than those prepared at higher temperatures. Moreover, the obtained results show that adopting the discontinuous (layered) filling strategy will improve the liquefaction resistance of CPB. The finding presented in this thesis will contribute to efficient, cost effective and safer design of CPB structures in the mine areas, and will help in minimizing the risks of liquefaction-induced failure of CPB structures.
Influence Of Fine Particles On The Liquefaction Properties Of A Reference Sand
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Author : Zhehao Zhu
language : en
Publisher: Springer Nature
Release Date : 2023-02-11
Influence Of Fine Particles On The Liquefaction Properties Of A Reference Sand written by Zhehao Zhu and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-02-11 with Science categories.
Over the past thirty years, the liquefaction of sand containing a small amount of fine particles has become an engaging topic in the geotechnical community. Indeed, a great variety of field investigations revealed that the real liquefied soils are mainly composed of a host sand matrix and a small fraction of plastic or non-plastic fines. In this context, several series of monotonic and cyclic triaxial tests were performed to clarify the influence of these fine particles on the development of sand liquefaction. To get closer to in situ conditions, 1g shaking table tests were carried out with two different-sized model soil containers. The first one, small size, was essentially used to check the reconstitution and the saturation method. The second one, very large size, was manufactured to explore the sand liquefaction behaviour during base shaking in an almost actual engineering size. To numerically reproduce the sand liquefaction behaviour, the Dafalias model has been taken as an example and its input parameters were calibrated by an artificial intelligence method. An in-depth analysis of the proposed method was done with the elastoplastic theory.
Cyclic Behaviour Of Soils And Liquefaction Phenomena
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Author : Th. Triantafyllidis
language : en
Publisher: CRC Press
Release Date : 2004-07-01
Cyclic Behaviour Of Soils And Liquefaction Phenomena written by Th. Triantafyllidis and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-07-01 with Technology & Engineering categories.
This conference brought together specialists in cyclic soil behaviour in order to discuss important results and new ideas in the field, and to share expertise in design of various problems involving cyclic or dynamic behaviour of soils. This book covers a variety of topics: * Theory and analysis, including constitutive relations of soil under cyclic loading, post-seismic stability analysis of soil/structure, dynamic stability of structures, liquefaction analysis of marine structures due to cyclic loading, and more * Cyclic and dynamic laboratory and model testing, centrifuge testing and in-situ testing. * Numerical analysis, including computer methods * Design of industrial applications and marine structures, installation methods of piles, vibrocompaction, densification of ballast in railway structures, case studies of earthquakes and post-liquefaction observations.
On The Consolidation Behaviour Of Fine Grained Soils Under Cyclic Loading
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Author : Nina Silvia Müthing
language : en
Publisher:
Release Date : 2017
On The Consolidation Behaviour Of Fine Grained Soils Under Cyclic Loading written by Nina Silvia Müthing and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Effect Of Multi Directional Shaking On Liquefaction Of Sands
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Author : Harry Bolton Seed
language : en
Publisher:
Release Date : 1975
Effect Of Multi Directional Shaking On Liquefaction Of Sands written by Harry Bolton Seed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Buildings categories.
Shaking Table Tests Rigid Mass On Soil Stratum
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Author : Mark F. Nelson
language : en
Publisher:
Release Date : 1970
Shaking Table Tests Rigid Mass On Soil Stratum written by Mark F. Nelson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.