Marine Clay
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2021 ◽  
Vol 33 (11) ◽  
pp. 07021014
Hugo Carlos Scheuermann Filho ◽  
Gustavo Dias Miguel ◽  
João Victor Linch Daronco ◽  
Ricardo José Wink de Menezes ◽  
Lucas Festugato

2021 ◽  
Vol 61 (5) ◽  
pp. 1287-1301
Arlyn Aristo Cikmit ◽  
Takashi Tsuchida ◽  
Kana Takeyama ◽  
Ryota Hashimoto ◽  
Takatoshi Noguchi ◽  

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5764
Qiangqiang Cheng ◽  
Yaben Guo ◽  
Chaowei Dong ◽  
Jianfei Xu ◽  
Wanan Lai ◽  

Fly ash cement is used to solidify marine clay to prepare marine-clay-based cemented paste backfill (MCCPB) to fill the underground goaf of mines, which not only utilizes solid waste such as fly ash and marine clay, but also controls surface subsidence and protects the environment. To simulate the complex underground mine water environment of the filling body, a dry-wet cycle aquatic environment test under different material ratios and curing ages was designed. The water absorption and unconfined compression strength (UCS) of MCCPB with curing ages of 7 and 28 days under the action of 0, 1, 3, and 7 dry-wet cycles were investigated. The results indicate as the number of dry-wet cycles increases, the surface of MCCPB becomes significantly rougher, and the water content and the solid mass decrease accordingly. Different ratios and curing ages of MCCPB in dry-wet cycles of the UCS tend first to increase, then decrease. Meanwhile, the stress-strain curve of the specimen shows that the trend in the elastic modulus is consistent with that of UCS (first increasing, then decreasing), and that, the minimum UCS value of the specimen still meets the early strength requirements of cemented paste backfill in coal mine geothermal utilization. On the one hand, it proves the feasibility of fly ash cement-solidified marine clay for use as cemented paste backfill in coal mines; on the other hand, it also expands the available range of cemented paste backfill materials in coal mines.

Geosciences ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 386
Maurizio Ercoli ◽  
Roberto Bizzarri ◽  
Angela Baldanza ◽  
Angela Bertinelli ◽  
Diego Mercantili ◽  

The application of Ground Penetrating Radar (GPR) prospecting to the search of fossil structures, particularly using advanced techniques like Finite-difference time-domain (FDTD) modelling and GPR attribute analysis, is currently poorly exploited in paleontology. Here, we promote the use of such a GPR workflow at Bargiano (Umbria, central Italy), a unique paleontological site known for the discovery of cetacean skeletons, dolomitized sperm-whale cololites (Ambergrisichnu salleronae), and layered fossil assemblages. The study site is characterized by a very uneven topography shaping highly conductive clayey deposits, representing not exactly ideal conditions for GPR surveying. After generating models encompassing a real topography and variable electrical properties of media, we simulated buried fossil structures at variable depth with different size and geometry, using different operative frequencies. After obtaining information on the characteristics of reflections, investigation depth, and detectability, we provide a comparison with experimental data, also used to compute instantaneous amplitude and phase attributes. Upon depicting a peculiar GPR signature for our targets, we discuss the results in light of ground-truthing performed through trenching. Our workflow allowed us to restrict the excavation areas, extending the surface information in depth in a non-invasive way, and optimizing the field operations, necessary for the preservation of the study site.

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1647
Zunan Fu ◽  
Guoshuai Wang ◽  
Yanming Yu ◽  
Li Shi

The pile–bucket foundation that features a bucket slipped onto a monopile is a new type of symmetric offshore foundation supporting the wind turbine. Its load bearing and deformation resistance capacity are unclear, especially when subjected to cyclic horizontal loadings. In this paper, a model test has been designed and carried out for investigating the cyclic behavior of the pile–bucket foundation embedded in soft marine clay. Cyclic horizontal loads are applied in a displacement-controlled manner with different amplitudes and frequencies. The influences of cyclic loading parameters, including the amplitude, the frequency and the cycle number, have been studied from the perspectives of stiffness-degradation and damping effect that are evaluated from the recorded horizontal force–displacement relationships at the loading point. In addition, the influences of cyclic horizontal loading on the bending moment distribution and on the p–y curve have been presented and discussed. The results show that significant reductions in the foundation stiffness and in the soil resistance may be observed during the first few cycles when the loading displacement is relatively high.

2021 ◽  
Hailei Kou ◽  
Hao Jing ◽  
Chuangzhou Wu ◽  
Pengpeng Ni ◽  
Yiyi Wang ◽  

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