TY  - THES
T1  - Modified DOST-KASC method a simple, rapid, cost-effective and semi-empirical landslide assessment tool
A1  - Putra, Fernando Mersa
LA  - English
PP  - Quezon City
PB  - College of Engineering, University of the Philippines Diliman
YR  - 2013
UL  - https://tuklas.up.edu.ph/Record/UP-99796217610865513
AB  - The Department of Science and Technology-Kalinga Apayao State College (DOST-KASC) method is a newly developed landslide rating system which is regarded to be inexpensive and requiring only minimum expertise and training to use, making it suitable for rapidly performing preliminary slope stability assessments over wide areas. This study aims to compare the DOST-KASC method with established landslide rating systems such as the Japan Ministry of Construction (JMC), Japan Road Association (JRA), Slope Mass Rating (SMR) in order to assess its accuracy with respect to stability assessments for rock slopes performed using Limit Equilibrium Methods (LEM). Forty five slopes along the Halsema Highway in Benguet Province were selected and assessed using the DOST-KASC, JMC, JRA and SMR rating schemes. The stability of each forty five slopes was also assessed quantitatively using Limit Equilibrium Methods. The stability ratings of the forty five slopes using each of the four rating schemes were cross tabulated with the corresponding stability ratings obtained using each of the four methods and Limit Equilibrium Methods was also performed. The agreement between each rating scheme with Limit Equilibrium Methods was determined using the Pearson's Chi square statistic and the coefficient of correlation. results of the statistical analyses showed that the agreement between DOST-KASC and Limit Equilibrium Methods is higher than the JMC and JRA methods, but lower than that of the SMR rating scheme. Using the results of the statistical analyses, modifications to the DOST-KASC were proposed and implemented to improve the agreement between the assessments obtained using the DOST-KASC and Limit Equilibrium Methods. Two major parameters, namely the slope angle and the material strength of the slope, were modified from the original DOST-KASC in order to obtain better agreement. The modifications to the procedure for assessing the slope angle, incorporating effects of uniaxial strength and Rock Quality Designation (RQD) were introduced into the DOST-KASC procedure, and the agreement with the Limit Equilibrium Methods was investigated using the same statistical procedure employed previously. Based on the results of the forty five slopes assessed, modifications to the DOST-KASC increased the coefficient from 0.176 to 0.599. In comparison, the coefficient of correlation between the SMR method and Limit Equilibrium Methods for the forty five slopes assessed was 0.355. The results of this study demonstrate the potential of the modified DOST-KASC method as landslide rating scheme that gives results that are comparable in accuracy to the widely used SMR method when assessing rock slopes, while being simpler and faster to use than the SMR method.
CN  - LG 995 2013 E653 P88
KW  - Landslide hazard analysis.
ER  -