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The variation of grain size distribution in rock granular material in seepage process considering the mechanical-hydrological-chemical coupling effect: an experimental research.

ABSTRACT: As a common solid waste in geotechnical engineering, rock granular material should be properly treated and recycled. Rock granular material often coexists with water when it is used as the filling material in geotechnical engineering. Water flowing in rock granular materials is a complex progress with the mechanical-hydrological-chemical (MHC) coupling effect, i.e. the water scours in the gaps and spaces in the rock granular material structure, produces chemical reactions with rock grains, rock grains squeeze each other under the water pressure and compression leading to re-breakage and producing secondary rock grains, and the fine rock grains are migrated with water and rushed out. In this process, rock grain size distribution (GSD) changes, it affects the physical and mechanical characteristics of the rock granular materials, and even influences the seepage stability of the rock granular materials. To study the variation of GSD in the rock granular material considering the MHC coupling effect after the seepage process, seepage experiments of rock grain samples are carried out and analysed in this paper. The result is expected to have a positive impact on further studies of the properties of the rock granular material.

SUBMITTER: Kong H

PROVIDER: S-EPMC7029924 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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The variation of grain size distribution in rock granular material in seepage process considering the mechanical-hydrological-chemical coupling effect: an experimental research.

Kong Hailing H Wang Luzhen L Zhang Hualei H

Royal Society open science 20200108 1

As a common solid waste in geotechnical engineering, rock granular material should be properly treated and recycled. Rock granular material often coexists with water when it is used as the filling material in geotechnical engineering. Water flowing in rock granular materials is a complex progress with the mechanical-hydrological-chemical (MHC) coupling effect, i.e. the water scours in the gaps and spaces in the rock granular material structure, produces chemical reactions with rock grains, rock ...[more]

PMID: 32218928

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Project description:Background: The global coronavirus (Covid-19) pandemic concerns all people, but has a specific effect on those who are expecting a baby during this time. The advice in the UK changed rapidly, with 14 different sets of national guidance issued within 1 month. Individual NHS Trusts released various guidance relating to the withdrawal of homebirth services, the closure of birth centers, restrictions on the number of birth partners (if any) allowed during labor, and whether any visitors were allowed to attend after birth. With the landscape of maternity care changing so rapidly, research was carried out to provide real-time data to capture the lived experiences of expectant families. Methods: A mixed methods online survey was carried out over 2 weeks between 10th and 24th April 2020. The survey was open to those in the third trimester of pregnancy, those who had given birth since the beginning of the "lockdown" period in the UK, and the partners of pregnant women and people who were in these circumstances. The survey asked questions about how respondents' holistic antenatal experiences had been affected, whether their plans for birth had changed, and the effect of these changes on respondents' emotional wellbeing. Of the 1,700 responses received, 72 mentioned that they had seriously considered "freebirthing" (giving birth without a healthcare professional present). Findings: An analysis of the respondents' reasons for considering freebirth was conducted, finding that reasons for considering freebirth were complex and multifaceted. Lesbian, bisexual, pansexual, and queer women were more likely to have considered freebirth than heterosexual people (p < 0.001). Conclusions: Considering giving birth without a healthcare professional present is unusual in the Global North and represents an emerging field of study. The literature examining the reasons that people consider freebirth shows a variety of underlying motivations. A global pandemic represents a new factor in such considerations. The findings from this research can help inform maternity service planning in future crises.

Dataset Information

The variation of grain size distribution in rock granular material in seepage process considering the mechanical-hydrological-chemical coupling effect: an experimental research.

Publications

The variation of grain size distribution in rock granular material in seepage process considering the mechanical-hydrological-chemical coupling effect: an experimental research.

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