Time-Domain Analysis of Tamper Displacement during Dynamic Compaction Based on Automatic Control

Xi, Li; Yang, Hong; Zhang, Jingyu; Qian, Guoping; Yu, Huanan; Cai, Jun

doi:10.3390/coatings11091092

Cited by 24 publications

(10 citation statements)

References 30 publications

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“…In contrast, the wall-molecule interactions can be overlooked in macroscopic scale; the classic NS equation, designed to capture fluid flow behavior in large scale, has not considered the interaction. Hence, the complexity induced by heterogeneity as well as ultra-small pore scale renders the flow behavior inside realistic shale matrix extremely difficult to be identified (Feng et al 2020;Ji et al 2021a, b;Li et al 2021). Other than that, in light of the broad application scope, lots of research attention have been attracted on this heat research topic.…”

Section: Introductionmentioning

confidence: 99%

Nanoconfined methane flow behavior through realistic organic shale matrix under displacement pressure: a molecular simulation investigation

Sun

Huang

et al. 2021

J Petrol Explor Prod Technol

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Academic investigations digging into the methane flow mechanisms at the nanoscale, closely related to development of shale gas reservoirs, had attracted tremendous interest in the past decade. At the same time, a good understanding of the complex essence remains challenging, while the broad theoretical scope, as well as application value, possesses great attraction. In this work, with the help of molecular dynamics methods nested in LAMMPS software, a fundamental framework is established to mimic the nanoconfined fluid flow through realistic organic shale matrix. Denoting evident discrepancy with existed contributions, shale matrix in this work is composed of specific number of kerogen molecules, rather than simple carbon-based nanotube. Recently, promotion efforts have been implemented in the academic community with the use of kerogen molecules, however, gas flow simulations are still lacking, and the pore shape in the current papers is always hypothesized as slit pores. The pore-geometry assumption seriously conflicts with the general observation phenomenon according to the advanced laboratory experiments, such as SEM image, AFM technology, that the organic pores tend to have circular pore geometry. In order to fill the knowledge gap, the circular nanopore with desirable pore size surrounded by kerogen molecules is constructed at first. The organic nanopore with various thermal maturity can be obtained by altering the kerogen molecular type, expecting to achieve more physically and theoretically similar to the realistic shale matrix. After that, methane flow simulation is performed by utilization of non-equilibrium molecular dynamics, the methane density as well as velocity distribution under different displacement pressures are depicted. Furthermore, detailed discussion with respect to the simulation results is provided. Results show that (a) displacement pressure acts as a dominant role affecting methane flow velocity and, however, fails to affect methane density distribution, a behavior mainly controlled by molecular–wall interactions; (b) the velocity distribution feature appears to be in line with the parabolic law under high atmosphere pressure, which can be attributed to small Knudsen number; (c) the simulation time will be prolonged with larger displacement pressure imposed on nanoconfined methane. Accordingly, this work can provide profound basis for accurate evaluation of nanoconfined gas flow behavior through shale matrix.

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Section: Introductionmentioning

confidence: 99%

Nanoconfined methane flow behavior through realistic organic shale matrix under displacement pressure: a molecular simulation investigation

Sun

Huang

et al. 2021

J Petrol Explor Prod Technol

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“…Sensing technology adoption has been challenged by the fragmented and temporary nature of construction projects, along with technology-related, adoption process-related, and human-related factors [ 23 , 24 ]. The real-time locating systems (RTLS) have been proved to be valid in construction productivity enhancement.…”

Section: Introductionmentioning

confidence: 99%

A Governance Framework to Assist with the Adoption of Sensing Technologies in Construction

Arabshahi

Wang

et al. 2021

Sensors

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Sensing technologies present great improvements in construction performance including the safety, productivity, and quality. However, the corresponding applications in real projects are far behind compared with the academically research. This research aims to discover dominate influence factors in the sensing technologies adoption and ultimately develop a governance framework facilitating adoption processes. The framework is dedicated on general sensing technologies rather than single sensor in previous framework studies. To begin with, the influence factors of sensing technologies and other similar emerging technologies are summarised through a review. Then, a mixed methods design was employed to collect quantitative data through an online survey, and qualitative data through semi-structured interviews. Findings of the quantitative method reveal that the most widely implemented sensing technologies are GPS and visual sensing technology, but they’re still not adopted by all construction companies. Partial Least Squares Structural Equation Modelling reveals that supplier characteristics have the highest effect in all influence factors. Qualitative method was adopted to investigate perceptions of construction stakeholders on the major decision-making considerations in the adoption process. Ultimately, a triangulation analysis of findings from the literature review, online survey and interviews resulted in the governance framework development. The overarching contribution of this research focus on the general adoption of sensing technologies rather than the adoption of a specific sensor. Therefore, the governance framework can assist with the decision-making process of any sensing technology adoption in construction.

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“…Compaction tests were carried out to determine the optimal water content in the three mix proportions: A, B, and C considering the particle size in the mixture may influence the result of the compaction test (Li et al, 2020;Li et al, 2021). The test process is strictly conducted by JTG E51-2009 (2009).…”

Section: Compaction Test and Optimum Moisture Content Compaction Testmentioning

confidence: 99%

Experimental Study on the Road Performance of High Content of Phosphogypsum in the Lime–Fly Ash Mixture

Qian

Zhong

et al. 2022

Front. Mater.

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Phosphogypsum (PG), as a by-product of the production of phosphoric acid, faces the problems of large annual output and difficult treatment. There is a large demand for fillers in the process of road paving, which may be an effective method for the utilization of PG resources. In this study, three proportions of phosphogypsum–lime–fly ash (PLF) mixture were designed, first, according to orthogonal tests. The comprehensive performance of the PLF mixture was tested by the compression rebound modulus test, unconfined compressive strength test, flexural tensile strength test, dry shrinkage test, and temperature shrinkage test, respectively. The results show that adding crushed stone to the PLF mixture can effectively improve the compression rebound modulus, unconfined compressive strength, and flexural tensile strength. The high content of PG in the mixture can also improve the dry shrinkage and temperature shrinkage properties of the mixture. According to the road layer requirements, the optimum proportion of the PLF mixture is recommended, which may benefit the road construction and PG resources.

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Time-Domain Analysis of Tamper Displacement during Dynamic Compaction Based on Automatic Control

Cited by 24 publications

References 30 publications

Nanoconfined methane flow behavior through realistic organic shale matrix under displacement pressure: a molecular simulation investigation

Nanoconfined methane flow behavior through realistic organic shale matrix under displacement pressure: a molecular simulation investigation

A Governance Framework to Assist with the Adoption of Sensing Technologies in Construction

Experimental Study on the Road Performance of High Content of Phosphogypsum in the Lime–Fly Ash Mixture

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