Experiment and Analysis of Variance for Stabilizing Fine-Grained Soils with Cement and Sawdust Ash as Liner Materials
Sadiq Iliyas,
Ahmad Idris,
Ibrahim Haruna Umar
et al.
Abstract:Due to volume change and low strength, fine-grained soils are problematic in construction. Stabilization with cement and sawdust ash (SDA) by-products can improve engineering properties. This study aimed to investigate the effectiveness of cement and sawdust ash (SDA) in stabilizing fine-grained soils for liner applications. Varying proportions of cement (0–9%) and SDA (0–10%) were added to soil samples (n = 24). Specimens were tested for unconfined compressive strength (UCS), hydraulic conductivity (HC), and … Show more
This paper uses the statistical analysis model and covariance analysis model to study the teaching effect of Civics and Politics in colleges and universities from the dimensions of students’ values, academic situation analysis, and classroom participation, investigates the students’ satisfaction with the comprehensive quality of the student management workers, their management attitude and management effect, and evaluates the overall effect of the management of students in colleges and universities. Finally, we analyzed the relationship between college civic politics and student management and created an innovative approach to cultivating college civic politics and student management synergistically. The results indicate that the average value of each dimension of student values in Civic and Political Teaching is greater than 4 points. The students were satisfied with the overall quality of managers, management attitude, and management effect, with a satisfaction rate of 82.41%, 75.68%, and 68.10%, respectively. This study provides a comprehensive theoretical system and reference materials for managing moral education in colleges and universities and serves as a guide for future students’ moral education management.
This paper uses the statistical analysis model and covariance analysis model to study the teaching effect of Civics and Politics in colleges and universities from the dimensions of students’ values, academic situation analysis, and classroom participation, investigates the students’ satisfaction with the comprehensive quality of the student management workers, their management attitude and management effect, and evaluates the overall effect of the management of students in colleges and universities. Finally, we analyzed the relationship between college civic politics and student management and created an innovative approach to cultivating college civic politics and student management synergistically. The results indicate that the average value of each dimension of student values in Civic and Political Teaching is greater than 4 points. The students were satisfied with the overall quality of managers, management attitude, and management effect, with a satisfaction rate of 82.41%, 75.68%, and 68.10%, respectively. This study provides a comprehensive theoretical system and reference materials for managing moral education in colleges and universities and serves as a guide for future students’ moral education management.
The Tiga Dam, a primary hydraulic structure in northern Nigeria, is subjected to intense hydrological stress during the rainy season, posing potential risks to its structural integrity. This study investigates the geotechnical properties and stability of the Tiga Dam in Kano State, Nigeria. Twelve soil samples from the downstream area were analyzed for specific gravity, grain size distribution, Atterberg limits, compaction parameters, permeability, and shear strength. The dam’s stability was assessed using Plaxis 2D under various reservoir conditions. Soil erodibility was evaluated using the Revised Universal Soil Loss Equation (RUSLE), and a linear regression model with noise was developed to predict soil expansion rates. The results showed heterogeneous soil properties, with specific gravity ranging from 2.11 to 2.63 and permeability from 3.40 × 10−9 to 1.49 × 10−7 m/s. Stability analysis revealed factors of safety of 1.322, 1.006, 1.002, and 1.147 for high reservoir, rapid drawdown, slow drawdown, and low reservoir conditions, respectively. The RUSLE K factor ranged from 0.055 to 0.145, indicating low to moderate soil erodibility. The expansion rate model demonstrated high accuracy (R2 = 0.989) in predicting seasonal and long-term soil expansion trends, with peak rates increasing from 16.94 mm/month in 2010–2013 to 19.45 mm/month in 2017–2020. This comprehensive analysis provides crucial insights into the Tiga Dam’s geotechnical behavior, highlighting potential vulnerabilities and the need for targeted management strategies to ensure long-term stability and safety.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.