Matrix Suction of Unsaturated Colluvium Slope Influenced by Rainfall and Plant Condition: A Case of Taiwan Huafan University

摘要

This study investigates the variation of matrix suction, water content and ground water level before and after the rainfall for the unsaturated colluvium slope in the campus of Fuafan University. The measuring devices including electrical matrix suction, water content and ground water level were set up in different surface of planting condition for each depth in real-time. It is observed that the matrix suction in the time from July to September is higher; however, when heavy rains caused by typhoonhappened, matrix suction will drop rapidly. This variation is obvious in short grass zone and less clear in the broadleaf tree zone. The maximum value in short grass zone, long grass zone and broadleaf tree zone at 2 m depth are 90.3, 68.2, 18.5 kPa, respectively. These results are expected to serve as a reference for the study of slope stability mechanisms.