Kajian Geologi Bencana Dan Kohesifitas Tanah Terhadap Tanah Longsor Di Jalan Lintas Riau - Sumbar, Kilometer 21-25 Desa Tanjung Alai, Kecamatan Pangkalan Koto Baru, Kabupaten Lima Puluh Kota, Provinsi Sumatra Barat

Sofyan, Reyhan (2019) Kajian Geologi Bencana Dan Kohesifitas Tanah Terhadap Tanah Longsor Di Jalan Lintas Riau - Sumbar, Kilometer 21-25 Desa Tanjung Alai, Kecamatan Pangkalan Koto Baru, Kabupaten Lima Puluh Kota, Provinsi Sumatra Barat. Other thesis, Universitas Islam Riau.

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Abstract

The objectives of the study were to identify geological, geomorphological, soil cohesiveness, rock petrography, soil erosion, geological structures, and safety factors in the study area. The method used is geomorphology analysis method, lithology analysis, petrographic analysis, Atterberg Limit, Direct Shear Test, slope safety factor analysis, and landslide type analysis. The study area has a landscape classified into Geomorphological Units of Structural Steep Hills (S2) and Denudasional Steep Denominational Geomorphological Units (D3). Composite lithology consists of sabak, silt and sand . River flow patterns are classified as Subdenritik flow. The geological structure that developed in the research area is joint with the main direction of the north-south-east. The value of cohesion and internal shear angle obtained from Direct Shear Stress at Station 1 (0.301kg / cm², 18 °), Station 5 (0.286 kg / cm², 21 °), Station 10 (0.261 kg / cm², 27 °), Station 12 (0,180kg / cm², 27 °), Station 17 (0,360 kg / cm², 27 °) can be concluded that at station research area with credibility included in medium class, consistency Very soft and density Very loose. Security factors include into the classification of labile types with the lowest value of 0.412 and the highest value of 1.427. The types of landslide that dominate in the research area are avalanche debris and earth flow. The appropriate avalanche mitigation recommendation in the study area is Gravity Wall mounted against the Middle East-North and North-bound slope direction (Cut Slope).

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