Abstract
Some slopes in Yogyakarta, Indonesia, were covered by volcanic soil of the quaternary deposit of Merapi volcano. Typically, the soil layers of the slope consist of fine sand or silty sand. During the wet season (November – February), the slope is prone to instability due to rainfall infiltration. This paper presents the field suction monitoring of silty-sand slope. A 2.57 m high slope at Universitas Muhammadiyah Yogyakarta campus was instrumented with a mini tensiometer, moisture probe, and rain gauge to study the effect of suction on the slope stability during rainfall in wet season. The investigation shows that the rainfall decreases the suction and increase the moisture of soil. This situation leads to slope instability. The factor of safety fluctuates corresponding to the rainfall intensity. The lowest factor of safety was attained on 30 December, in which the rainfall intensity is the highest, i.e. 48 mm/day.
Highlights
Many slopes in Indonesia are covered by volcanicresidual soil, which comprises of loose structure
This paper presents the results of suction monitoring in an instrumented man-made slope at Universitas Muhammadiyah Yogyakarta (UMY) campus (Figure 1)
The research found that the rainwater infiltrates and increases the moisture of the soil causing suction decreases during the rainfall event
Summary
Many slopes in Indonesia are covered by volcanicresidual soil, which comprises of loose structure. The slopes are prone to failure due to rainfall. Lessen research has been conducted on the saturatedunsaturated behavior of the volcanic soil slopes in Indonesia [1]. Rainwater infiltrates into the soil and induces landslides. It is common to evaluate the slope stability at the critical condition when it is in the fully saturated condition. At this condition, a positive pore water was generated along the slope depth. The negative pore water pressure or suction plays a significant role in controlling the slope stability [2]. The suction decreases during the high-intensity rainfall and induces a slope failure [3]
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