TOWARDS DEVELOPMENT OF SUSTAINABLE SLOPE PROTECTION IN TROPICAL SOILS

• Main Author: , Dwikorita Karnawati , Nimol Vameurn , Veasna Long , Su Su Kyi
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : HAGI-IAGI-PERHAPI 2005
• Online Access: https://repository.ugm.ac.id/95446/; http://repository.ugm.ac.id/digitasi/index.php?module=cari_hasil_full&idbuku=3264
• Institution: Universitas Gadjah Mada

<p>Some engineering geological investigations on factors controlling landslides have been carried out at a pilot study area situated at the foot-slope of Eastern Kulon Progo Mountains. Slope monitoring by using strain gauges (SG1 to SG5) and piezometers (PZ1 to PZ5) has been conducted to analyze mechanism of slope movements in response to the change of slope hydrology due to rain infiltration.<br /> Based on those monitoring, it was found that the slope movement (creeping) occurred within the colluvial deposits, in particular at the layer of tuff which was overlain by the lenses of tufaceous breccias, i.e. claystone-mudstone breccia and claystone-mudstone-andesitic breccia. In the upper foot-slope part, this moving zone was recorded by SG1 occurring at 9.00 to 9.50 m depth and by SG2 at 12.50 to 13.50 m depth. In the middle slope such movement was recorded by SG3 at the zone of 5.50 m to 6.50 m. depth. Meanwhile, at the lower foot-slope the movement occurred at the contact between mudstone of Nanggulan Formation and colluvial deposits consisting of layers of tufaceous claystone breccia and sandy clay. The moving zone was recorded by SG4 and SG5 at the depth of 2.50 m. All of those recorded movements were relatively parallel to the slope dip direction, and continuously resulted in soil cracks, subsidence, and also caused some damages on the irrigation channel and the bridge. Relatively low permeability in all of those colluvial deposits (with the K value varies from 3.06 x 10-&#8310