Cement based eco-grouting composite for pre-reinforcement of shallow underground excavation in vegetation protection area

2021 ◽  
Vol 118 ◽  
pp. 104188
Author(s):  
Cong Zhang ◽  
Junsheng Yang ◽  
Jinyang Fu ◽  
Shuying Wang ◽  
Jian Yin ◽  
...  
2015 ◽  
Vol 35 ◽  
pp. 232-235 ◽  
Author(s):  
Leonardo Piccinini ◽  
Paolo Fabbri ◽  
Marco Pola ◽  
Enrico Marcolongo ◽  
Alessia Rosignoli

Author(s):  
Van Min Nguyen ◽  
V. A. Eremenko ◽  
M. A. Sukhorukova ◽  
S. S. Shermatova

The article presents the studies into the secondary stress field formed in surrounding rock mass around underground excavations of different cross-sections and the variants of principal stresses at a mining depth greater than 1 km. The stress-strain analysis of surrounding rock mass around development headings was performed in Map3D environment. The obtained results of the quantitative analysis are currently used in adjustment of the model over the whole period of heading and support of operating mine openings. The estimates of the assumed parameters of excavations, as well as the calculations of micro-strains in surrounding rock mass by three scenarios are given. During heading in the test area in granite, dense fracturing and formation of tensile strain zone proceeds from the boundary of e ≥ 350me and is used to determine rough distances from the roof ( H roof) and sidewalls ( H side) of an underground excavation to the 3 boundary e = 350me (probable rock fracture zone). The modeling has determined the structure of secondary stress and strain fields in the conditions of heading operations at great depths.


2019 ◽  
Vol 21 (2) ◽  
pp. 1374-1386
Author(s):  
Daniel Paulo Braga ◽  
Gislania de Meneses Silva ◽  
Tulio Viana Bandeira ◽  
Maria Lucia Brito da Cruz

O referido trabalho busca fazer uma análise dos impactos ambientais oriundos da construção da via paisagística às margens do Rio Maranguapinho no bairro Canindezinho, ressaltando as transformações geradas pela sua implantação e a modificação do espaço urbano e das formas de ocupação da planície fluvial do rio neste trecho. Para a obtenção de resultados, foi realizado pesquisas bibliográficas e visitas em órgãos públicos para levantamento e obtenção de material digital ou impresso acerca da temática abordada. Efetuou-se a análise de imagens de satélite dos anos de 2010 e 2016 em caráter de comparação das temporalidades quanto as ocupações na Área de Proteção Permanente – APP. Também foram realizadas visitas de campo em pontos do bairro para verificação dos impactos e melhor compreender a realidade do objeto em estudo. Logo, os resultados demonstram que as intervenções realizadas pela via paisagística agregaram outros equipamentos urbanos de infraestrutura e organização espacial, tais como barragens, praças e conjuntos habitacionais, incluindo a qualificação das margens para a recuperação das APPs de aproximadamente 50 metros ao longo do rio, contudo, foram identificados problemas quanto a remoção dos moradores e a utilização das áreas desapropriadas para a acumulação de resíduos sólidos.Palavras-chave: Área de Preservação Permanente. Recursos Hídricos. Impacto Ambiental. ABSTRACTThis work seeks to analyze the environmental impacts of the construction of the landscaped road on the banks of the Maranguapinho River in the Canindezinho neighborhood, highlighting the transformations generated by its implantation and the modification of the urban space and the forms of occupation of the fluvial plain of the river in this section . In order to obtain results, bibliographical researches and visits were made to public agencies to collect and obtain digital or printed material about the subject matter. The analysis of satellite images of the years 2010 and 2016 was carried out in a comparison of temporalities and occupations in the Permanent Protection Area (APP). Field visits were also carried out at points in the neighborhood to verify impacts and better understand the reality of the object being studied. Therefore, the results show that the landscape interventions added other urban infrastructure and spatial organization equipment, such as dams, squares and housing complexes, including the qualification of the margins for the recovery of PPAs of approximately 50 meters along the river, however, problems were identified regarding the removal of the residents and the use of the expropriated areas for solid waste accumulation.Keywords: Permanent Preservation Area. Water resources. Environmental impact. RESUMENEste trabajo busca analizar los impactos ambientales derivados de la construcción de la carretera ajardinada a orillas del río Maranguapinho en el barrio de Canindezinho, destacando las transformaciones generadas por su implementación y la modificación del espacio urbano y las formas de ocupación de la llanura del río en este tramo. . Para obtener resultados, se llevaron a cabo investigaciones bibliográficas y visitas a agencias públicas para recopilar y obtener material digital o impreso sobre el tema. Se analizaron imágenes satelitales de 2010 y 2016 para comparar las temporalidades con respecto a las ocupaciones en el Área de Protección Permanente - APP. También se realizaron visitas de campo en puntos del vecindario para verificar los impactos y comprender mejor la realidad del objeto en estudio. Por lo tanto, los resultados muestran que las intervenciones paisajísticas han agregado otra infraestructura urbana y equipo de organización espacial, como presas, plazas y urbanizaciones, incluida la calificación de márgenes para la recuperación de APP de aproximadamente 50 metros a lo largo del río, sin embargo, se identificaron problemas con respecto a la remoción de residentes y el uso de áreas expropiadas para la acumulación de desechos sólidos.Palabras clave: Área de Preservación Permanente. Recursos hídricos. Impacto ambiental.


2019 ◽  
Vol 21 (2) ◽  
pp. 962-975
Author(s):  
Emerson Rodrigues Lima ◽  
Ana Carla Alves Gomes ◽  
Ícaro Paiva de Oliveira ◽  
Maria Lucia Brito da Cruz

A pesquisa trata de uma análise da relação sociedade natureza no contexto da Área de Proteção Ambiental (APA) do rio Ceará e teve como objetivo principal o estudo dos impactos negativos sofridos a partir dessa interação, descrevendo os principais problemas ocasionados pela ocupação desordenada, como a intervenção nas dunas, poluição do mangue e desmatamento da mata ciliar, os quais condicionam a mudança da dinâmica natural do ambiente causando interferências paisagísticas e biológicas no local. O aporte teórico metodológico embasa-se nas teorias clássicas pertinentes, bem como levantamento de dados secundários, trabalho de campo e a técnica de geoprocessamento para a elaboração de material cartográfico. Os resultados demonstram a urgência em inserir práticas vinculadas a educação ambiental na APA, dessa forma, o trabalho visa servir de subsídio à conscientização da necessidade de preservação deste ambiente, recomendando, assim o diálogo entre a população e os órgãos responsáveis para garantir o uso sustentável da mesma.Palavras-chave: Conservação; Educação Ambiental; Análise Geoambiental. ABSTRACTThe research deals with an analysis of the relation nature-society in the context of the APA (Ambiental Protection Area) of Ceará River and it had as main objective the study of the negative impacts suffered from this interaction, describing the main problems caused by the disordered occupation, such as the intervention in the dunes, mangrove pollution and deforestation of the riparian forest, which condition the change of the natural dynamics of the environment causing landscape and biological interferences in the place. The theoretical methodological support is based on the relevant classical theories, as well as secondary data collection, field work and the geoprocessing technique for the preparation of cartographic material. The results show the urgency to insert practices related to environmental education in the APA, so this work aims to serve as a subsidy to raise awareness of the need to preserve this environment, recommending in this way the dialogue between the population and responsible bodies to ensure sustainable use of the same. Keywords: Conservation; Environmental education; Geoenvironmental Analysis. RESUMENLa investigación aborda un análisis de la relación de la sociedad de la naturaleza en el contexto del Área de Protección Ambiental (APA) del río Ceará y su objetivo principal fue el estudio de los impactos negativos sufridos por esta interacción, describiendo los principales problemas causados por la ocupación desordenada, como el intervención en las dunas, contaminación del manglar y deforestación del bosque ribereño, que condicionan el cambio de la dinámica natural del ambiente causando interferencia biológica y paisajística en el lugar. La base teórica metodológica se basa en las teorías clásicas relevantes, así como en la recolección secundaria de datos, el trabajo de campo y la técnica de geoprocesamiento para la preparación de material cartográfico. Los resultados demuestran la urgencia de insertar prácticas relacionadas con la educación ambiental en la APA, por lo tanto, el trabajo tiene como objetivo apoyar la conciencia de la necesidad de preservar este medio ambiente, recomendando así el diálogo entre la población y los organismos responsables para garantizar un uso sostenible de la misma.Palabras clave: Conservación; Educación ambiental; Análisis geoambiental.


1991 ◽  
Vol 24 (11) ◽  
pp. 51-62 ◽  
Author(s):  
N. Guiguer ◽  
T. Franz

In the last few years, groundwater management has concentrated on the protection of groundwater quality. An increasing number of countries has adopted policies to protect vital groundwater resources from deterioration by regulating human interaction with the subsurface, the use of potential contaminants, land use restrictions, and waste transport and storage. One of the more common regulatory approaches to the protection of groundwater focuses on public water supplies to reduce the potential of human exposure to hazardous contaminants. Under the framework of the Safe Drinking Water Act amended by U.S. Congress in 1986, The U.S.EPA (1987) issued guidelines for the delineation of wellhead protection areas, recommending the use of analytical and numerical models for the identification of such areas. In this study, the theoretical background for the development of one such numerical model is presented. Two real-world applications are discussed: in the first case history, the model is applied to a Superfund Site in Puerto Rico as a tool for assessment of the effectiveness of a proposed pump-and-treat scheme for aquifer remediation. Based on simulation results for the evolution of the existing contaminant plume it was verified that such a scheme would not work with the proposed purging wells. The second case history is the delineation of a wellhead protection area in the Town of Littleton, Massachusetts, and subsequent design of a monitoring well network.


Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4743
Author(s):  
Tomasz Janoszek ◽  
Zbigniew Lubosik ◽  
Lucjan Świerczek ◽  
Andrzej Walentek ◽  
Jerzy Jaroszewicz

The paper presents the results of experimental and model tests of transport of dispersed fluid droplets forming a cloud of aerosol in a stream of air ventilating a selected section of the underground excavation. The excavation selected for testing is part of the ventilation network of the Experimental Mine Barbara of the Central Mining Institute. For given environmental conditions, such as temperature, pressure, relative humidity, and velocity of air, the distribution of aerosol droplet changes in the mixture of air and water vapor along the excavation at a distance was measured at 10 m, 25 m, and 50 m from the source of its emission. The source of aerosol emission in the excavation space was a water nozzle that was located 25 m from the inlet (inlet) of the excavation. The obtained results of in situ tests were related to the results of numerical calculations using computational fluid dynamics (CFD). Numerical calculations were performed using Ansys-Fluent and Ansys-CFX software. The dimensions and geometry of the excavation under investigation are presented. The authors describe the adopted assumptions and conditions for the numerical model and discuss the results of the numerical solution.


Insects ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 248
Author(s):  
Marina E. O. Rangel ◽  
Luana P. R. Oliveira ◽  
Aline D. Cabral ◽  
Katharyna C. Gois ◽  
Marcos V. M. Lima ◽  
...  

In 2018–2019, we conducted mosquito collections in a municipal vehicle impound yard, which is 10 km from the Serra do Mar Environmental Protection Area in Santo André, SP, Brazil. Our aim is to study arboviruses in the impound yard, to understand the transmission of arboviruses in an urban environment in Brazil. We captured the mosquitoes using human-landing catches and processed them for arbovirus detection by conventional and quantitative RT-PCR assays. We captured two mosquito species, Aedes aegypti (73 total specimens; 18 females and 55 males) and Ae. albopictus (34 specimens; 27 females and 7 males). The minimum infection rate for DENV-2 was 11.5 per 1000 (CI95%: 1–33.9). The detection of DENV-2 RNA in an Ae. albopictus female suggests that this virus might occur in high infection rates in the sampled mosquito population and is endemic in the urban areas of Santo André. In addition, Guadeloupe mosquito virus RNA was detected in an Ae. aegypti female. To our knowledge, this was the first detection of the Guadeloupe mosquito virus in Brazil.


2020 ◽  
Vol 35 ◽  
pp. 101143
Author(s):  
Michele Fernandes ◽  
Estefan Monteiro da Fonseca ◽  
Leonardo da Silva Lima ◽  
Susanna Eleonora Sichel ◽  
Jessica de Freitas Delgado ◽  
...  

Crustaceana ◽  
2013 ◽  
Vol 86 (2) ◽  
pp. 158-181 ◽  
Author(s):  
Raúl Cruz ◽  
Carlos A. Borda

Estimates of spiny lobster stocks (Panulirus argus Latreille, 1804) represent a fundamental input for population assessment models and are, therefore, indispensable for proper management. In this study we analysed methodologies employed in the Gulf of Batabanó (Cuba) and Providencia and Santa Catalina (Colombian Caribbean) to estimate abundance (N) and stock productivity. We found evidence that the relative abundance (CPUE) for trap-like jaulones and skin diving in natural shelters was likely to remain high despite the decline in abundance (hyperstability). In contrast, the proportionality between CPUE and N was satisfactory in artificial shelters (Cuban pesqueros). Stock productivity was greater for jaulones (22 288 kg/km2) than for pesqueros (1309 kg/km2) or natural shelters (15.25 kg/km2), reflecting differences in the productive capacity of each type of fishing gear. In natural shelters the exploitable biomass is under great fishing pressure and the reproductive stock is likely to decrease. Thus, the West zone of Providencia and Santa Catalina, characterized by high-density seagrass and mangrove, should be designated a marine protection area to prevent a lobster fishing collapse. The most effective measure to revert the lobster fishing collapse in Cuba would be to ban the use of jaulones and liftable pesqueros, thereby reducing fishing intensity.


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