干旱区生态环境知识资源中心(Arid): An experimental investigation on collapsible behavior of dry compacted phosphate mine waste rock in road embankment

Arid

DOI	10.1016/j.trgeo.2020.100439
	An experimental investigation on collapsible behavior of dry compacted phosphate mine waste rock in road embankment
	Amrani, Mustapha; Taha, Yassine; Elghali, Abdellatif; Benzaazoua, Mostafa; Kchikach, Azzouz; Hakkou, Rachid
通讯作者	Benzaazoua, M (corresponding author), Mohammed VI Polytech Univ UM6P, Min Environm & Circular Econ Program EMEC, Ben Geurir, Morocco.
来源期刊	TRANSPORTATION GEOTECHNICS
ISSN	2214-3912
出版年	2021
卷号	26
英文摘要	Prescribing compaction at optimum water content in arid and semi-arid climate regions generally leads to unjustified ecological practices. Indeed, to achieve optimum densities for road embankment compaction, significant volumes of water are required, which is perceived as a very scarce resource in drought-prone areas. Dry compaction with the promotion of the use of materials at their natural moisture content can be a promising alternative that could save water resources. Nevertheless, dry compaction can affect the infrastructures' stability under flooding conditions. This paper presents field and laboratory tests carried out to investigate the effect of dry compaction on Phosphate Mine Waste Rocks (PMWR) behavior. In situ tests were conducted and the PMWR dry compaction protocol has been defined. Furthermore, the collapse deformation and the shear strength properties were evaluated through double oedometer and triaxial tests, respectively. The microstructural evolution on wetting was evaluated using mercury intrusion porosimetry (MIP) and 3D X-Ray computed tomography techniques. The water retention curve and mineralogical quantification tools were used to explain the influence of hydraulic hysteresis and clay minerals properties on the hydro-geotechnical behavior of PMWR. The results show a significant effect of applied stress level and dry density in addition to the type and amount of clayey expansive minerals on the structural deformation of PMWR on wetting. PMWR showed a maximum collapse settlement of 5.33% under a pressure of 1500 kPa, while no collapse is expected for stress less than 100 kPa. Low content of clays was identified as well as the swelling shrinkage potential within PMWR. The ability of using PMWR as embankment materials at dry moisture content under total overburden stress below 200 kPa ensuring a dry density of at least 95%.sigma(d)(max) is confirmed. The results of this work can also be applied to standard materials with similar hydro-geotechnical characteristics.
英文关键词	Phosphate mine waste rock Dry compaction Laboratory and field investigations Collapse-swelling potential Microstructural study Hydraulic hysteresis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000608436100007
WOS关键词	SOILS
WOS类目	Engineering, Civil ; Engineering, Geological
WOS研究方向	Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348251
作者单位	[Amrani, Mustapha; Kchikach, Azzouz] Cadi Ayyad Univ UCA, L3G Lab, Res Team Civil Engn & Geoengn, Marrakech, Morocco; [Taha, Yassine; Benzaazoua, Mostafa; Hakkou, Rachid] Mohammed VI Polytech Univ UM6P, Min Environm & Circular Econ Program EMEC, Ben Geurir, Morocco; [Elghali, Abdellatif; Kchikach, Azzouz] Mohammed VI Polytech Univ UM6P, Geol & Sustainable Min, Ben Geurir, Morocco; [Benzaazoua, Mostafa] Univ Quebec Abitibi Temiscamingue, Inst Rech Mines & Environm, Rouyn Noranda, PQ J9X 5E4, Canada; [Hakkou, Rachid] Cadi Ayyad Univ, Fac Sci & Technol, Imed Lab, Abdelkar Elkhattabi Ave,POB 549, Marrakech 40000, Morocco
推荐引用方式 GB/T 7714	Amrani, Mustapha,Taha, Yassine,Elghali, Abdellatif,et al. An experimental investigation on collapsible behavior of dry compacted phosphate mine waste rock in road embankment[J],2021,26.
APA	Amrani, Mustapha,Taha, Yassine,Elghali, Abdellatif,Benzaazoua, Mostafa,Kchikach, Azzouz,&Hakkou, Rachid.(2021).An experimental investigation on collapsible behavior of dry compacted phosphate mine waste rock in road embankment.TRANSPORTATION GEOTECHNICS,26.
MLA	Amrani, Mustapha,et al."An experimental investigation on collapsible behavior of dry compacted phosphate mine waste rock in road embankment".TRANSPORTATION GEOTECHNICS 26(2021).