Comparison Study Of Multi-Stage Triaxial (Cu) Shear Strength Parameters With Single-stage For Soil With MH Or A-7-5 (25) Classification (25)

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Comparison Study of Multi-Stage Cu Triaxial Shear Strength Parameters with Single-Stage for MH or A-7-5 (25) Classification Land Classification

Introduction

Soil sampling is a crucial aspect of geotechnical engineering, as it provides valuable data for structural planning and analysis. However, soft soil often poses challenges, especially related to the low level of sample recovery. This condition can limit the number of samples available for laboratory testing, such as triaxial testing. Triaxial testing is a widely used method to determine the shear strength of soils, but it requires a sufficient number of samples to produce accurate results. In this study, we aim to compare the results of triaxial tests with multi-stage methods to the conventional triaxial testing (single-stage) for soil with MH or A-7-5 (25) classification.

Background

The Unified Soil Classification System (USCS) and the AASHTO classification are widely used to categorize soils based on their physical properties. Soil classification is essential in geotechnical engineering, as it helps to determine the suitability of a soil for a particular application. In this study, the soil sample used was categorized as MH according to the USCS or A-7-5 (25) according to the AASHTO classification. This method makes it possible to produce accurate data even in the axial stretch limits specified.

Methodology

Triaxial CU testing with multi-stage methods is expected to provide effective alternatives, especially when the number of samples is limited. In this study, the multi-stage method was used to limit axial strain to 4% in the deviatoric phase. The test results were compared to the conventional triaxial testing (single-stage) to determine the accuracy of the multi-stage method. The hyperbolic equation of the hypothesis condner was used to predict the voltage value for several strain values, namely under unlimited conditions (∞), and at 5%, 10%, 15%, and 20%. The results showed that the prediction of the voltage value with infinite strain input tends to produce a higher value than the experimental results. However, after evaluating, the prediction value that is closest to the experimental results is obtained using a strain input of 15%.

Results

The results of the test showed a fairly good level of accuracy in terms of soil shear strength. For the total voltage condition, a suitability of 102.17% is obtained for cohesion (C) and 98.99% for the deep shear angle (φ). Meanwhile, for effective voltage conditions, the results show adequate compatibility with 82.40% for effective cohesion (C ') and 105.26% for the effective shear angle (φ'). The results confirm the potential of multi-stage methods as an efficient solution in testing triaxial cu for soft soil.

Discussion

This study confirms the potential of multi-stage methods as an efficient solution in testing triaxial cu for soft soil. This is mainly relevant in the context of geotechnical techniques, where the accuracy of soil data is very important for structural planning and analysis. The multi-stage method can be a more practical option in the field conditions where perfect sampling is difficult to do. Therefore, further research is expected to explore the application of this method in various types of soil and other conditions, to expand the reliability and validity of the results of the Multi-Stage CU triaxial testing.

Conclusion

In conclusion, this study aims to compare the results of triaxial tests with multi-stage methods to the conventional triaxial testing (single-stage) for soil with MH or A-7-5 (25) classification. The results show that the multi-stage method can provide accurate data even in the axial stretch limits specified. This study confirms the potential of multi-stage methods as an efficient solution in testing triaxial cu for soft soil. Therefore, further research is expected to explore the application of this method in various types of soil and other conditions, to expand the reliability and validity of the results of the Multi-Stage CU triaxial testing.

Recommendations

Based on the results of this study, the following recommendations are made:

  1. Further research is expected to explore the application of the multi-stage method in various types of soil and other conditions.
  2. The multi-stage method can be a more practical option in the field conditions where perfect sampling is difficult to do.
  3. The hyperbolic equation of the hypothesis condner can be used to predict the voltage value for several strain values.

Limitations

This study has several limitations, including:

  1. The study only used soil samples with MH or A-7-5 (25) classification.
  2. The study only used the multi-stage method to limit axial strain to 4% in the deviatoric phase.
  3. The study only compared the results of the multi-stage method to the conventional triaxial testing (single-stage).

Future Research Directions

Based on the results of this study, the following future research directions are suggested:

  1. Explore the application of the multi-stage method in various types of soil and other conditions.
  2. Investigate the effect of different axial strain limits on the accuracy of the multi-stage method.
  3. Compare the results of the multi-stage method to other testing methods, such as the direct shear test.
    Q&A: Comparison Study of Multi-Stage Cu Triaxial Shear Strength Parameters with Single-Stage for MH or A-7-5 (25) Classification Land Classification

Q: What is the purpose of this study?

A: The purpose of this study is to compare the results of triaxial tests with multi-stage methods to the conventional triaxial testing (single-stage) for soil with MH or A-7-5 (25) classification.

Q: What is the significance of soil classification in geotechnical engineering?

A: Soil classification is essential in geotechnical engineering, as it helps to determine the suitability of a soil for a particular application. In this study, the soil sample used was categorized as MH according to the Unified Soil Classification System (USCS) or A-7-5 (25) according to the AASHTO classification.

Q: What is the multi-stage method, and how does it differ from the conventional triaxial testing (single-stage)?

A: The multi-stage method is a testing method that limits axial strain to 4% in the deviatoric phase. This method is expected to provide effective alternatives, especially when the number of samples is limited. In this study, the multi-stage method was used to compare the results to the conventional triaxial testing (single-stage).

Q: What is the hyperbolic equation of the hypothesis condner, and how is it used in this study?

A: The hyperbolic equation of the hypothesis condner is a mathematical equation used to predict the voltage value for several strain values. In this study, the equation was used to predict the voltage value for several strain values, namely under unlimited conditions (∞), and at 5%, 10%, 15%, and 20%.

Q: What are the results of the study, and what do they indicate?

A: The results of the study show that the multi-stage method can provide accurate data even in the axial stretch limits specified. The results also indicate that the prediction of the voltage value with infinite strain input tends to produce a higher value than the experimental results. However, after evaluating, the prediction value that is closest to the experimental results is obtained using a strain input of 15%.

Q: What are the implications of this study, and what are the recommendations for future research?

A: The study confirms the potential of multi-stage methods as an efficient solution in testing triaxial cu for soft soil. This is mainly relevant in the context of geotechnical techniques, where the accuracy of soil data is very important for structural planning and analysis. Therefore, further research is expected to explore the application of this method in various types of soil and other conditions, to expand the reliability and validity of the results of the Multi-Stage CU triaxial testing.

Q: What are the limitations of this study, and how can they be addressed in future research?

A: The study has several limitations, including the use of soil samples with MH or A-7-5 (25) classification, the use of the multi-stage method to limit axial strain to 4% in the deviatoric phase, and the comparison of the results to the conventional triaxial testing (single-stage). These limitations can be addressed in future research by exploring the application of the multi-stage method in various types of soil and other conditions, investigating the effect of different axial strain limits on the accuracy of the multi-stage method, and comparing the results of the multi-stage method to other testing methods.

Q: What are the future research directions suggested by this study?

A: The following future research directions are suggested:

  1. Explore the application of the multi-stage method in various types of soil and other conditions.
  2. Investigate the effect of different axial strain limits on the accuracy of the multi-stage method.
  3. Compare the results of the multi-stage method to other testing methods, such as the direct shear test.

Q: What are the practical implications of this study for geotechnical engineers and researchers?

A: The study provides practical implications for geotechnical engineers and researchers, including the potential of multi-stage methods as an efficient solution in testing triaxial cu for soft soil. This is mainly relevant in the context of geotechnical techniques, where the accuracy of soil data is very important for structural planning and analysis.