Evaluasi Dinding Penahan Tanah Sheet Pile Pada Gedung KCU BCA Surabaya

Aisha, Della (2021) Evaluasi Dinding Penahan Tanah Sheet Pile Pada Gedung KCU BCA Surabaya. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proyek pembangunan Gedung KCU BCA Surabaya yang berlokasi di Jalan Mayjen Yono Suwoyo Surabaya Barat direncanakan memiliki 2 lantai basement. Kondisi tanah di daerah ini merupakan tanah lempung dengan konsistensi medium to stiff clay. Proyek ini terletak dilokasi yang padat lalu lintas dan dekelilingi oleh bangunan gedung tinggi yang lain seperti PTC Mall. Dinding penahan tanah yang dipilih untuk pembangunan basement yaitu flat concrete sheet pile. Untuk memantau pergerakan dinding penahan tanah maka dilakukan monitoring inklinometer pada 6 titik. Inklinometer titik I-1 mencapai deformasi sebesar 105 mm dengan kedalaman galian 8,6 meter. Syarat batas maksimum deformasi lateral dinding penahan tanah yaitu 0,5%, sedangkan pada inklinometer titik I-1 sudah melebihi batas persyaratan yang berlaku dengan hasil deformasi dibandingkan dengan kedalaman mencapai 1,2%. Oleh karena itu harus dilakukan analisis lebih lanjut terkait evaluasi dinding penahan tanah yang diperlukan. Proyek akhir ini bertujuan untuk mengetahui stabilitas dinding penahan tanah, stabilitas tanah dasar galian, perbandingan deformasi lateral dinding berdasarkan pemodelan dengan inklinometer, kekuatan strutting dan kekuatan pilecap dalam menahan gaya horizontal akibat beban strut.
Persyaratan yang digunakan yaitu mengacu pada SNI 8460:2017 tentang Persyaratan Perancangan Geoteknik. Pemodelan dilakukan dengan metode elemen hingga program bantu Plaxis. Dari pemodelan didapatkan hasil deformasi lateral dinding, gaya momen, gaya geser, safety factor, dan gaya aksial yang terjadi pada strut.
Analisis dinding penahan tanah yang telah dilakukan yaitu dengan push-in failure menghasilkan angka keamanan 2,46 dan analisis tanah dasar galian dengan basal heave menghasilkan angka keamaan antara 2,12 – 3,21. Analisis tersebut telah memenuhi persyaratan yaitu lebih dari 1,5. Perbandingan deformasi lateral dinding berdasarkan pemodelan dengan inklinometer cenderung sama, namun untuk titik I-1 berbeda jauh yaitu sebesar 105 mm dibandingkan dengan pemodelan sebesar 34,2 mm. Gaya tekan pada strut berdasarkan pemodelan berkisar antara 31 ton – 79 ton. Sedangkan kuat tekan strut berdasarkan perhitungan yang mengacu pada SNI 1729:2020 tentang Spesifikasi untuk Bangunan Gedung Baja Struktural yaitu berkisar antara 81 ton – 169 ton, sehingga kekuatan strut memenuhi persyaratan. Analisis evaluasi dinding penahan tanah masih memenuhi persyaratan. Deformasi lateral berdasarkan inklinometer yang melebihi batasan deformasi, kemungkinan terjadi karena perencanaan strut yang tidak sesuai dengan persyaratan atau terjadinya kesalahan pembacaan saat monitoring.
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The KCU BCA Surabaya Building construction project, which is located on Jalan Mayjen Yono Suwoyo, West Surabaya, is planned to have 2 basement floors. The soil condition in this area is clay soil with medium to stiff clay consistency. This project is located in a traffic-heavy location and is surrounded by other high-rise buildings such as PTC Mall. The retaining wall chosen for the basement construction is flat concrete sheet pile. To monitor the movement of the retaining wall, monitoring inclinometer is carried out at 6 points. The point I-1 inclinometer reached a deformation of 105 mm with an excavation depth of 8.6 meters. The maximum limit requirement for lateral deformation of the retaining wall is 0.5%, while the inclinometer point I-1 has exceeded the applicable requirements with the deformation results compared to the depth reaching 1.2%. Therefore, further analysis related to the evaluation of the required retaining wall must be carried out. This final project aims to determine the stability of the retaining wall, the stability of the excavated subgrade, the comparison of the lateral deformation of the wall based on modeling with an inclinometer, the strutting strength and the pilecap strength in resisting horizontal forces due to strut loads.
The requirements used are referring to SNI 8460:2017 concerning Geotechnical Design Requirements. The modeling is done by using the finite element method Plaxis program. From the modeling, the results obtained are lateral wall deformation, moment, shear force, safety factor, and axial force that occurs in the strut.
The analysis of retaining walls that has been calculated with push-in failure resulted in a safety number of 2.46 and an analysis of subgrade excavation using basal heave resulted a safety number between 2.12 - 3.21. The analysis has fulfilled the requirements of more than 1.5. The comparison of lateral wall deformation based on modeling with an inclinometer tends to be the same, but for point I-1 it is much different with 105 mm compared to 34.2 mm from modeling. The force on the strut based on the modeling ranges from 31 tons – 79 tons. Meanwhile, the compressive strength of the strut is based on calculations that refer to SNI 1729:2020 concerning Specifications for Structural Steel Buildings, which ranges from 81 tons - 169 tons, so that the strength of the strut has fulfilled the requirements. The evaluation analysis of retaining walls has fulfilled the requirements. Lateral deformation based on the inclinometer that exceeds the deformation limit, may occur due to improper strut planning or the occurrence of reading errors during monitoring.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Dinding penahan tanah, sheet pile, inklinometer, galian dalam, strutting.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA174 Computer-aided design. T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA760+ Retaining walls
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	DELLA AISHA
Date Deposited:	26 Aug 2021 06:45
Last Modified:	26 Aug 2021 06:45
URI:	http://repository.its.ac.id/id/eprint/89757

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