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Landslides or commonly called landslides are a disaster that often hits areas with tropical climates. The damage caused by landslides is most dominantly structural damage such as damaged road sections that are cut off. At the research location, there was a landslide that resulted in the obstruction of the road flow which was originally two lanes to one lane, it is feared that landslides will occur again, so one of the landslide prevention techniques is to use retaining walls. Based on this, this study is deemed necessary to determine the slope safety factor and to determine the safety of the slope after using retaining walls. The purpose of this study was to determine the level of slope safety without being given a load, the level of slope safety after being given a load of 25 Kpa and the level of slope safety after being given a load of 25 kpa and the addition of a retaining wall on the research slope using a Retaining Wall. In this study using the Finite Element Method in the calculation to find the level of safety of a slope, the researcher used the help of Plaxis 2D V20 Software, and the results of the calculation obtained a slope safety factor of 1.31, after being given a load of 25 kpa the slope safety factor was 1.14 and after being given a retaining wall the slope safety factor increased to 2.46.

The bearing capacity of the soil is the support of the foundation, where the foundation transmits the loads derived from the weight of the building itself and the loads acting on the building to the surrounding soil. The purpose of this paper is to determine the handling of seepage and soil reinforcement needed in the case study of the Margatiga Dam Project, East Lampung. Based on the results of geological investigations, the Margatiga Dam is composed of a quarter-aged rock layer with a fragment composition of fine sand - gravel, with a soft - hard hardness level and the need for foundation repair. Based on the lithological conditions of the Margatiga Dam Extraction Gate foundation and the Spillway building which are composed of relatively deep and quite porous alluvial sand deposits, this causes the curtain grouting results to be ineffective, therefore it is necessary to change the seepage control design from the Grouting Curtain to the boundary wall. Based on the simulation check in Plaxis Software for Seepage and Excavation Staging, processing was carried out using Secant Pile and Soldier Pile with a depth of 30 meters with a stretch of 140 m and overlapping with Curtain Grouting of Embankment Dam on the left side and 5 m right side. Field PMT results showed that the maximum stress of the rock layer under the spillway foundation was 0.016 MPa and 0.630 MPa.    

The foundation is a substructure which functions to support the loads and forces caused by the superstructure (superstructure) to the soil layer which will carry these loads and forces. Deep foundations are usually used to obtain a large enough soil bearing capacity and if the depth of the hard soil is far below the ground surface. The aim of this task is to analyze the bearing capacity of pile foundations using sondir data, standard penetration test (SPT) data, as well as the finite element method using the plaxis program. The method used in this final assignment is by studying literature, then collecting the necessary data, and after that carrying out calculation analysis using existing methods. From the results of the calculations carried out, different results were obtained. Where for sondir data at point S1 obtained Qu =115.80 tons; at point S2 obtained Qu = 104.80 tons; at point S3 obtained Qu = 105.50 tons. Meanwhile, based on SPT data at point BH-01, Qu = 398.23 tons, and using the plaxis program Qu = 425 tons

Daya dukung tanah merupakan kemampuan tanah dalam menahan tekanan atau beban dari struktur atas bangunan dengan aman tanpa menimbulkan kegalalan ataupun penurunan. Beberapa metode digunakan untuk menganalisis daya dukung tanah, diantaranya yaitu dengan metode Terzaghi, Mayerhoff, Hasen, Vesic, Oshaki dan menggunakan software dengan parameter dan hasil yang berbeda. Tujuan penelitian ini untuk mengetahui perbandingan daya dukung tanah pondasi dangkal menggunakan metode Terzaghi, Mayerhoff dan software Plaxis 2D. Data sekunder yang digunakan berupa gambar perencanaan dan data tanah hasil uji labolatorium. Berdasarkan analisis menggunakan metode Terzaghi, Mayerhoff dan Software Plaxis 2D diperoleh nilai daya dukung tanah ijin (Qall) secara berurutan sebesar 20,322, 25,612 dan 16,827 t/m2. Berdasarkan hasil daya dukung tanah pondasi dangkal pada metode analitis dan software plaxsis 2D didapatkan bahwa perhitungan daya dukung tanah ijin (Qall) pondasi dangkal metode Meyerhoff lebih besar dari perhitungan metode Terzaghi dan Sofware Plaxis 2D. 

Thus, the slope at Building C of the Faculty of Economics of Cenderawasih University needs to be handled in the form of evaluation or review of the plaster structure (talud), by improving the dimensions, and the slope is analyzed by drained conditions, the slope becomes stable as the slope safety factor changes to 1.557. which according to the safety factor (SF) slope is more than 1.5, and the calculation of Stabilita against shear of slope safety factor is 1,678, which according to safety factor more 1.5. Means that the wall is able to withstand the moment of land that works

Penurunan (settlement) pondasi harus dihitung dengan hati-hati untuk memastikan stabilitas bangunan, menara, jembatan, dan struktur yang membutuhkan biaya tinggi untuk membangunnya. Hal yang menjadi penyebab utama terjadinya penurunan adalah deformasi dari tanah. Dalam praktiknya, setiap perencanaan bangunan dilakukan analisa penurunan yang akan ditimbulkan akibat beban permanen dan operasional dari bangunan tersebut. Dari analisa tersebut dapat diketahui estimasi seberapa besar penurunan yang akan terjadi. Analisa ini dapat dilakukan dengan menggunakan persamaan-persamaan matematis closed-form ataupun melalui pemodelan matematis dengan menggunakan perangkat lunak komputer. Salah satu kasus penurunan tanah terjadi pada lokasi Stone Crusher Plant di Maloko, Parung, Bogor. Bangunan Stone Crusher yang sudah selesai dikonstruksi dan berdiri dengan tegak kemudian mengalami settlement tidak merata pada salah satu sisi tumpuan bawahnya, sehingga bangunan menjadi miring. Program penyelidikan tanah dan monitoring dilakukan untuk mendapatkan data primer dari lokasi penelitian. Perilaku penurunan tanah dievaluasi dengan menggunakan finite element software yaitu PLAXIS 2D, dengan berdasarkan data tanah dan monitoring yang ada. Selanjutnya, penurunan pasca-konstruksi dan saat operasional struktur diprediksikan. Desain perbaikan dengan menggunakan Jet Grouting juga dilakukan untuk mengetahui efeknya terhadap pola penurunan yang terjadi. Jet Grouting cukup efektif dalam mengurangi penurunan yang terjadi sehingga kemiringan yang akan terjadi pasca-konstruksi dan saat operasional berkurang.