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How do you calibrate and maintain the slope stability instrumentation to ensure accuracy and reliability?

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Slope stability instrumentation is a vital tool for engineering geology, as it helps to monitor and assess the potential hazards and risks of landslides, rockfalls, and other slope failures. However, to ensure the accuracy and reliability of the data collected by these devices, you need to calibrate and maintain them properly. In this article, we will explain how to do that in six steps.

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Riadny Ferreira

Engenheira Geotécnica Plena ? Engenheira Civil ? Engenharia de Registro (EdR/EoR) ? Seguran?a e Monitoramento de…

1 Choose the right instruments

The first step is to choose the right type of instruments for your slope stability project, depending on the site conditions, the objectives, and the budget. There are various types of instruments available, such as inclinometers, extensometers, piezometers, tiltmeters, crackmeters, and strain gauges. Each instrument has its own advantages and limitations, and you need to consider factors such as installation method, measurement range, resolution, sensitivity, durability, and cost.

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Riadny Ferreira

Engenheira Geotécnica Plena ? Engenheira Civil ? Engenharia de Registro (EdR/EoR) ? Seguran?a e Monitoramento de Barragens ? Doutoranda em Geotecnia ? Mestra em Geotecnia
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O plano de instrumenta??o precisa ser elaborado, fundamentado na objetividade, confiabilidade e facilidade, baseando-se em alguns objetivos: - realizar o controle de constru??o (caso seja uma obra em andamento); - capacidade de identifica??o do desempenho da obra; - escolha de localiza??o estratégica para detec??o des possíveis perigos iminentes; - aproveitamento de furos de sondagem para instala??o de instrumentos, reduzindo custos.

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2 Install the instruments correctly

The second step is to install the instruments correctly, following the manufacturer's instructions and the best practices for engineering geology. You need to ensure that the instruments are aligned, anchored, sealed, and protected from environmental factors, such as moisture, temperature, and vibration. You also need to ensure that the instruments are connected to a reliable power source and a data logger or a wireless network.

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3 Calibrate the instruments regularly

The third step is to calibrate the instruments regularly, to ensure that they are measuring the slope movements and parameters accurately and consistently. Calibration is the process of comparing the instrument readings with a known standard or reference, and adjusting them if necessary. You need to calibrate the instruments before and after installation, and at periodic intervals during the monitoring period. You also need to calibrate the instruments after any significant event, such as a heavy rainfall, an earthquake, or a slope failure.

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4 Maintain the instruments periodically

The fourth step is to maintain the instruments periodically, to ensure that they are functioning properly and reliably. Maintenance is the process of inspecting, cleaning, repairing, and replacing the instrument components, such as batteries, cables, sensors, and casings. You need to maintain the instruments according to the manufacturer's recommendations and the site conditions. You also need to maintain the instruments when you observe any signs of damage, deterioration, or malfunction.

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5 Validate the data quality

The fifth step is to validate the data quality, to ensure that the data collected by the instruments are valid and reliable. Validation is the process of checking, verifying, and correcting the data for any errors, anomalies, or outliers. You need to validate the data using various methods, such as cross-checking with other instruments, comparing with historical data, applying statistical tests, and performing field observations.

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Riadny Ferreira

Engenheira Geotécnica Plena ? Engenheira Civil ? Engenharia de Registro (EdR/EoR) ? Seguran?a e Monitoramento de Barragens ? Doutoranda em Geotecnia ? Mestra em Geotecnia
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Ao observar as leituras dos instrumentos, o profissional precisa fazer uma "limpeza" de possíveis dados que possam ser outliers. Esta limpeza precisa ser assertiva de acordo com o contexto regional. Além disso, a metodologia aplicada para avalia??o dos instrumentos precisa basear-se na compara??o entre comportamento esperado e comportamento observado. Assim, é possível identificar possíveis comportamento an?malos que despertem a aten??o e provoquem a busca por melhorias àquele talude.

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6 Interpret the data meaningfully

The sixth and final step is to interpret the data meaningfully, to understand the slope behavior and the implications for engineering geology. Interpretation is the process of analyzing, synthesizing, and presenting the data in a clear and concise way, using graphs, charts, maps, and reports. You need to interpret the data using various techniques, such as trend analysis, slope stability analysis, risk assessment, and decision support.

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Riadny Ferreira

Engenheira Geotécnica Plena ? Engenheira Civil ? Engenharia de Registro (EdR/EoR) ? Seguran?a e Monitoramento de Barragens ? Doutoranda em Geotecnia ? Mestra em Geotecnia
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A interpreta??o dos dados precisa ser holística, considerando todo o contexto da estrutura, como por exemplo: - A visualiza??o das leituras de instrumentos locados na mesma se??o de montante para jusante, pode dar insights importantes nas conclus?es sobre o talude, por exemplo. - A correla??o da pluviometria com os níveis dos instrumentos também é um ponto a se atentar na análise dos dados. - A análise da estabilidade precisa ser feita avaliando sempre a pior situa??o - de acordo com as normas, para garantia da seguran?a.

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7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Riadny Ferreira

Engenheira Geotécnica Plena ? Engenheira Civil ? Engenharia de Registro (EdR/EoR) ? Seguran?a e Monitoramento de Barragens ? Doutoranda em Geotecnia ? Mestra em Geotecnia
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Para taludes de barragens, a instala??o de instrumentos precisa ser baseada no "rastreio" destas principais informa??es: - deslocamentos superficiais (horizontais e verticais); - deslocamentos no interior do maci?o (verticais e horizontais); - poropress?o e tens?es totais no interior do maci?o; - níveis hidrostáticos; - cargas atuantes nos elementos estruturais; - vaz?es de percola??o no maci?o; - vibra??es.

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How do you calibrate and maintain the slope stability instrumentation to ensure accuracy and reliability?

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1 Choose the right instruments

2 Install the instruments correctly

3 Calibrate the instruments regularly

4 Maintain the instruments periodically

5 Validate the data quality

6 Interpret the data meaningfully

7 Here’s what else to consider

Engineering Geology

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