Studi Pergeseran Tiang Pancang pada Tanah Lunak: Kasus Pembangunan Tol Semarang-Demak Paket 1B

Sagita, Novera (2025) Studi Pergeseran Tiang Pancang pada Tanah Lunak: Kasus Pembangunan Tol Semarang-Demak Paket 1B. Masters thesis, Institut Teknologi Sepuluh Nopember.

Text 6012231074 -MASTER_THESIS .pdf - Accepted Version Restricted to Repository staff only until 1 April 2027. Download (12MB) | Request a copy

Abstract

Proyek Jalan Tol Semarang-Demak adalah bagian dari sistem jalan tol yang menghubungkan Semarang dan Demak. Pada Paket Pembangunan Jalan Tol Semarang-Demak 1B, direncanakan dibangun sebuah elevated bridge sepanjang 392 m dari STA. 1+578 hingga STA 1+970. Pekerjaan elevated bridge ini dirancang menggunakan fondasi tiang pancang. Kondisi tanah di lokasi tersebut adalah tanah Clay dan Silt sangat lunak hingga medium (lapisan compressible) dengan ketebalan hingga kurang lebih 35 meter. Pada lokasi ini dipancang 56 buah tiang beton berdiameter 1,0 m. Pada saat penggalian pekerjaan footing, terjadi pergeseran pada 11 tiang yang telah ditanam pada kedalaman 68 m. Berdasarkan hal tersebut, tujuan dalam penelitian ini adalah untuk mengidentifikasi penyebab pergeseran tiang pancang, upaya mitigasi supaya tiang pancang yang belum tergali tidak ikut bergeser dan solusi perkuatan agar daya dukung rencana fondasi tercapai paska terjadinya pergeseran pancang ini. Penelitian ini menganalisis berdasarkan simulasi numerik menggunakan Limit Equilibrium Method (LEM) dan Finite Element Method (FEM). Penelitian ini meninjau penyebab pergeseran dari aspek pengaruh excess pore pressure, tahapan pelaksanaan, dan ada tidaknya alat berat di sekitar lokasi kerja. Hasil penelitian menunjukkan bahwa kombinasi antara karakteristik tanah lunak, adanya penggalian, excess pore pressure dan beban alat berat di sekitar area menjadi faktor penyebab pergeseran. Akibat pergeseran tiang ini, kapasitas dukung fondasi menjadi berkurang sehingga diusulkan penambahan 8 buah titik pancang sebagai perkuatan. Dari hasil analisis salah satu upaya yang dapat dilakukan adalah untuk meminimalisir pergeseran adalah dengan menurunkan nilai excess pore pressure sebelum dilakukan penimbunan serta memperbesar jarak antara alat berat yang bekerja dengan tiang pancang. Nilai excess pore pressure yang diminimalisir hingga derajat konsolidasi 90% (U90%), nilai lateral displacement dapat diturunkan 27,36 kali lebih kecil dari pada kondisi eksisting. Excavator yang berada pada radius 3,5 m dari tiang pancang menyebabkan nilai pergeseran lateral tiang pancang meningkat 3,7 kali dibandingkan pada area yang tidak terdapat excavator.
======================================================================================================================================
The Semarang-Demak Toll Road Project is part of a toll road system connecting Semarang and Demak. In the Semarang-Demak Toll Road Development Package 1B, a 392 m elevated bridge is planned to be built from STA. 1+578 to STA 1+970. This elevated bridge work is designed using pile foundations. The soil conditions at the location are very soft to medium clay and silt (compressible layer) with a thickness of up to approximately 35 meters. At this location, 56 concrete piles with a diameter of 1.0 m were installed. During the excavation of the footing work, there was a shift in 11 piles that had been driven at a depth of 68m. Based on this, the objectives in this study are to identify the causes of pile displacement, mitigation efforts so that the piles that have not been excavated do not shift and reinforcement solutions so that the bearing capacity of the foundation design is achieved after the displacement of these piles. This research is analysis based on numerical simulation using Limit Equilibrium Method (LEM) and Finite Element Method (FEM). The research investigated the causes of the displacement from the aspects of the influence of excess pore pressure, the stages of construction, and the location of heavy equipment in the surrounding area. The results showed that the combination of soft soil characteristics, excavation, excess pore pressure and the load of heavy equipment around the area were the factors that caused the displacement. As a result of this pile displacement, the bearing capacity of the foundation is reduced so that an additional 8 piles are proposed as reinforcement. From the results of the analysis, one of the methods that can be used to minimize the displacement is by reducing the excess pore pressure value above the embankment and increasing the distance between the pile and heavy equipment. If the excess pore pressure value is minimized to 90% consolidation degree (U90%), the lateral displacement value can be reduced 27.36 times smaller than the existing condition. Excavators that are located at a radius of 3.5 m from the piles cause the lateral displacement value of the piles to increase 3.7 times compared to the area where there are no excavators.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Pergeseran Tiang, Tanah Lunak, Fondasi Tiang Pancang, Lateral Displacement, Soft Soil, Spun Pile Fondation.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA775 Foundations. T Technology > TA Engineering (General). Civil engineering (General) > TA780 Piles and pile-driving T Technology > TA Engineering (General). Civil engineering (General) > TA780.C29 Piling (Civil engineering)
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Novera Sagita
Date Deposited:	23 Jan 2025 01:06
Last Modified:	23 Jan 2025 01:27
URI:	http://repository.its.ac.id/id/eprint/116631

Actions (login required)

View Item