Study on the Difference of Stability Calculation Between Numerical Simulation Analysis and Limit Equilibrium Methods--Take Huangmuya Landslide as an Example
Zhao Changjun,
Wu Liudong,
Jiang Nan,
Xu Minghui
Issue:
Volume 9, Issue 2, June 2021
Pages:
12-17
Received:
23 April 2021
Accepted:
8 June 2021
Published:
21 June 2021
Abstract: Numerical simulation analysis and limit equilibrium methods are usually used in landslide stability analysis. In order to study the differences of calculation theory and results, this paper takes Huangmuya landslide as a case study. The field geological survey and exploration are used to determine the form and property of the landslide. The deformation characteristics and stability state are comprehensive analyzed based on the information of macroscopic inspection and professional monitoring data. It is considered that the potential slip zone of the landslide has not obviously deteriorated, and the induced formation mechanism of the landslide mainly comes from the process and deformation of the upper slip mass. Through the analysis, FLAC3D is applied to simulate the stability of Huangmuya landslideis. The numerical simulation results show that the displacement of the slope will further increase, mainly concentrated in the middle and leading edge of the slip mass. Besides, stability coefficients are calculated by five limit equilibrium methods. The relationship of stability coefficients is as follows: transfer coefficient method > Low method > US Army Corps of Engineers method > M-P method > Janbu method. Based on the numerical simulation results, it is recommended to give priority to the US Army Corps of Engineers method, Low method or M-P method as the stability calculation method because the deviation amount is all within±2%.
Abstract: Numerical simulation analysis and limit equilibrium methods are usually used in landslide stability analysis. In order to study the differences of calculation theory and results, this paper takes Huangmuya landslide as a case study. The field geological survey and exploration are used to determine the form and property of the landslide. The deforma...
Show More
Evaluation of Hydraulic Performance of Irrigation Scheme at Kuraz Sugar Development Project, Jinka, Ethiopia
Tamene Mojira,
Samuel Dagalo
Issue:
Volume 9, Issue 2, June 2021
Pages:
18-29
Received:
14 October 2021
Accepted:
1 November 2021
Published:
17 November 2021
Abstract: Performance assessment of irrigation system is important to conserve the scarce resource of water through improving performance of existing irrigation schemes. However, there was no study in the past on performance assessment of Kuraz Irrigation Scheme. Thus, this study was to evaluate the hydraulic performance of the irrigation scheme using hydraulic performance indicators. The study was carried out during the irrigation season from June to August, 2019. According to the results of the study, the value of adequacy, dependability, equity, equity ratio over head to tail, efficiency and deficiency were found to be 0.98, 0.03, 0.04, 0.91, 0.81 and 0.02 respectively. The values show that water delivery system of the scheme had a good performance. The conveyance system was satisfied 98% out of the total required amount of irrigation water during study period. The overall efficiency of the system was 81%, which implies that the efficiency of water supply was satisfactory. The overall average value of conveyance efficiency of the 3.33km Secondary canal was 81.20%. The conveyance loss was 18.80% of the water. Siltation and vegetation growth within the canal interferes with water flow reducing the conveyance efficiency. The values of effectiveness of infrastructure, water surface elevation ratio, delivery duration ratio and sustainability of irrigated areas were found to be 89.68%, 96%, 87.5% and 95.56% respectively. The results of maintenance indicators showed that the system requires minimum level of maintenance due to sedimentation of secondary canal, improper operation and management of the system. Hence, adequate maintenance and other proper management techniques are essential to improve the irrigation system performance.
Abstract: Performance assessment of irrigation system is important to conserve the scarce resource of water through improving performance of existing irrigation schemes. However, there was no study in the past on performance assessment of Kuraz Irrigation Scheme. Thus, this study was to evaluate the hydraulic performance of the irrigation scheme using hydrau...
Show More
