Alternative Design of Abutment Damage Management for Glendeng Bridge Tuban Regency

International Journal on Advanced Technology, Engineering, and Information System https://ojs.transpublika.com/index.php/IJATEIS Online ISSN 2828-5425 Alternative Design of Abutment Damage Management for Glendeng Bridge Tuban Regency Original Article https://doi.org/10.55047/ijateis.v4i1.1592 Alfanditya Ghazanfar1*, Moh. Muntaha2, Machsus Machsus3 1-3Master of Applied Study Programme in Engineering Maintenance and Restoration of Civil Structures Study Program Departemen Civil Infrastructure Engineering, Faculty of Vocational Studies, Institut Teknologi Sepuluh Nopember, Surabaya Indonesia Email: 1) Received : 24 December - 2024 Accepted : 29 January - 2025 Published online : 30 January - 2025 Abstract This study aims to reconstruct the damage to the bridge abutment that occurred in 2020. The bridge abutment was modeled based on its actual conditions, followed by simulations under various scenarios. The research methods included collecting secondary and primary data, as well as computational modeling. Secondary data collected consisted of bridge design drawings, soil data, and river water level data for specific time periods. The next step was to model the bridge structure using Plaxis software. The analysis results indicate that the collapse of the bridge abutment in 2020 was likely caused by floodwater infiltration into the soil, followed by a rapid decrease in floodwater levels. Slope stability analysis using PLAXIS software for the 2020 damage yielded a minimum safety factor (SFmin) of 1.184. After the flood subsided during the operational load stage (LWL), the SFmin indicated "Structural Failure." The failure was attributed to the infiltration process in the soil when the water reached the Low Water Level; flood-saturated soil became unstable as the water receded due to its transition to a saturated state. The 2021 reinforcement resulted in an SFmin of 1.097 during the bridge construction and embankment stages. The embankment load exceeded the capacity of the retaining wall, whose foundation was embedded in soft soil, leading to instability. To address the landslide in the 2021 reinforcement, a Contiguous Pile Wall was utilized, featuring a configuration of bored piles with a diameter of 1 m, a pile length of 30 m, concrete strength (f’c) of 30 MPa, and steel strength (fy) of 400 MPa. A single row of pile caps was included to support the retaining wall along the slip plane, consisting of a row of bored piles embedded as a Contiguous Pile Wall.The analysis results using Plaxis software showed that the safety factor (SF) increased to 1.551, with a total displacement of 0.069 m, which can be categorized as "Safe" according to the Indonesian National Standard (SNI) – 8460 of 2017 on Geotechnical Design. Keywords: Slope Stability, Abutment Damage, Bridge Abutment. 1. Introduction One of the basic infrastructure components of the transport network is roads and bridges. The bridge structure generally consists of two important parts, namely the superstructure and the substructure in the form of pillars and bridge abutments (Lutjito, 2016). The existence of buildings on the side of the riverbank, namely bridge pillars, is considered to be able to change the geometric or flow of the river so that it can affect the structure above it (Abdrabbo et al., 2024; Das & Sobhan, 2012; Isleem et al., 2022). Glendeng Bridge was built in 1991 - 1992, located in Kalirejo Village, Bojonegoro Subdistrict and Simo Village, Soko Subdistrict, is one of the closest accesses connecting Tuban Regency and Bojonegoro Regency (Mushthofa, 2023). The bridge over the Bengawan Solo Copyright: © 2025 by the authors. This is an open access article distributed under the terms and conditions of the CC BY 4.0. 111 Alfanditya Ghazanfar et al. | Volume 4 No. 1 2025 river has a length of 310 metres with a width of 7 metres. The superstructure is a type B steel frame with 5 (five) spans and the foundation structure uses steel piles. The chronology of damage to the Glendeng Bridge on 3 November 2020 was an avalanche of retaining walls on the bridge approach road in the Tuban Regency area which was thought to be due to the scouring of the Bengawan Solo river, followed by the bridge pillars shifting and resulting in a decrease in the bridge superstructure (steel frame) (Baum et al., 2008). Existing picture of Glendeng Bridge when there is damage to the approach road on the Tuban Regency side when damage occurs (Departemen Permukiman dan Prasarana Wilayah, 2002; GEO-SLOPE, 2012). Based on data obtained from BBWS Bengawan Solo on 3 November 2020, the average water level of ± 4 m. In 2021, the Tuban Regency Government carried out repair work after the damage that occurred in 2020 with design changes to the bridge approach road. The bridge abutment was set back 8 meters from the original abutment point to become part of the pillar. In February 2022 the Glendeng Bridge was reopened. However, at the end of 2022 the approach bridge pillars decreased, the new bridge abutments decreased by about 8 cm while the pillars decreased by an average of 35 cm. Through topographic measurements, conditions around the bridge approach abutments shifted the retaining wall about 19 cm to 46 cm and the pillar pile cap 16 cm to 20 cm which shifted towards the river (Zaein et al., 2023). To avoid worse conditions, the Glendeng Bridge was closed again at the end of 2022. Based on the chronology of damage in 2020 and 2022, it is interesting to reconstruct what caused damage to the bridge abutment in 2020. Then it also needs to be checked what caused the decline in the Abutment and pillars after the 2022 repair. Based on these problems to find out the cause of abutment damage to the Glendeng Bridge, the purpose of this thesis research is to know the reconstruction of the existing conditions of the Glendeng Bridge due to the landslides that occurred. Knowing the reconstruction of conditions and causes of landslides in the 2021 reinforcement conditions. Obtaining effective and efficient alternatives for handling rehabilitation of bridge damage after reinforcement in 2021. 2. Methods 2.1. Data Collection The data obtained is data obtained from the East Java Provincial Bina Marga Public Works Office and the Bengawan Solo BBWS. The data include the following: a) Topographic Data b) General Bridge Data c) Bridge Progress Report Data d) Topography Data e) Water Level Elevation Data f) Soil Data g) Bridge Structure Drawing Data 2.2. Soil Characteristics In the preparation of this research, soil data taken in the existing area of the Glendeng Bridge abutment is used. 2.3. Structure Modelling Structural modelling aims to determine the internal forces that occur. Structural modelling to determine the stability of the slope when landslides occur by referring to the slope shift indicated by the safety factor number using the Plaxis auxiliary program (Bowles, 1996; Isleem et al., 2022; Plaxis, 2012). 112 Alfanditya Ghazanfar et al. | Vol (...truncated)