Natural slope that are formed from the soil often experience landslides. Landslide occurs because the driving force received by the slope is greater than the ability of the slope to resist it. Thus forming a sliding plane that has a low stability. Factors that decrease the stability of the slope are infiltration of rainwater, vibrations that may come from earthquakes or moving loads, construction loads, and cracks. Rainwater that infiltrate through slope causes active force on the slopes and also decreases soil strength. Landslides due to infiltration of rainfall are common problems on residual soil slopes from the tropical region. Soil stabilization process for soil that have been experienced prior landslide, often encounter difficulty in compacting soil to form slope bodies. Loose sandy soil slopes has a very low strength so that expensive construction is needed. One possible way to do this is to fill the pores of the soil with certain aggregates. One of the aggregates is cement. The cement material is chosen because cement when liquid can seep in and fill the pores of the soil. After drying this cement can increase soil permeability and reduce soil pore numbers. Filling cement into the soil pores can be done by injection of liquid cement. The problems that will be raised in this study are: What is the change in soil permeability rate if the soil is injected with cement and how much changes in soil pore size when injected with cement. The method used in this study is to make a test model in the laboratory. By comparing soil without cement injection with soil that has been injected with cement, it will be known to increase soil permeability and decrease the soil pore number. From the preliminary test with proctor test, the maximum density was 1,286 gram/cm3 and the optimum water content was 18%. Decrease of coefisien permeability from without cement injection to with cement injection 31,5 %.

The purpose of this study was to find the relationship between density D and safety factor SF of the embankment against landslides. If the relation between D and SF is known, then we could simplify the slope stability calculation. The safety factor against landslides could be determined by only entering the degree of density. Calculation of slope stability does not need to be done repeatedly for every given of density degree. In addition, the results of this study can also be used to determine the minimum density level that must be prepared to obtain safety factor number that are still within the allowable safety number limits. The safety factor for landslides is calculated by the Simplified Bishop Method. The required soil parameter data are the value of   and c, which are obtained from the soil testing results in the laboratory. The method that will be used in this study is by conducting a series of density and soil shear strength tests in the laboratory, to obtain the soil parameters needed as data in analyzing the relationship between D and SF. First, a standard compaction test is carried out on samples that have been prepared, to get the maximum dry density (d maks). Then the samples are made with different density degrees D, then conducting direct shear test to get the appropriate values of c and . The soil parameters obtained from the test results in this laboratory are used to determine the safety factor SF based on the Simplyfied Bhisop equation using Geo-5 program. Furthermore, variations in SF values with D were analyzed statistically to obtain a relationship between D and SF. The slope stability calculation with Geo-5 program, shows that there is an increase in safety factor SF against landslides, with increasing degrees of density D. In other words, it can also be said that between D and SF are linearly related. The relationship between D and SF is expressed by SF = 0.033 D -2.215, where D value is expressed in percent.

Lereng adalah suatu permukaan tanah yang miring dan membentuk sudut tertentu terhadap suatu bidang horizontal. Pada tempat dimana terdapat dua permukaan tanah yang berbeda ketinggian, maka akan ada gaya yang bekerja mendorong sehingga tanah yang lebih tinggi kedudukannya cenderung bergerak ke arah bawah. Hal ini disebut dengan gaya potensial gravitasi yang menyebabkan terjadi kelongsoran. Kabupaten Tabanan memiliki beberapa ruas jalan yang melewati lereng, salah satunya adalah ruas Jalan Raya Bedugul. Ruas jalan ini merupakan ruas jalan penghubung antara Kabupaten Buleleng, Kabupaten Badung dan Kabupaten Tabanan. Telah terjadi kelongsoran pada lereng ini, tepatnya di KM 49 + 800 di Desa Candikuning, Kecamatan Baturiti, Kawasan Wisata Danau Beratan yaitu pada tanggal 21 Desember 2016 dan longsor susulan pada tanggal 10 Februari 2017. Untuk mencegah kemungkinan terjadinya longsor susulan yang sewaktu-waktu dapat terjadi lagi, maka perlu dilakukan langkah antisipasi dengan merencanakan perkuatan pada lereng tersebut. Pada studi ini dianalisis kekuatan geser tanah dengan perkuatan, untuk dapat mengetahui kemampuan perkuatan dalam menjaga kestabilan lereng. Juga dilakukan analisis kestabilan lereng di lokasi penelitian dengan tujuan dapat mengetahui kemampuan penggunaan perkuatan sebagai alternatif dalam mengatasi kelongsoran pada lereng tersebut. Berdasarkan analisis setelah dinding penahan diperkuat dengan barisan tiang bor diperoleh angka stabilitas terhadap guling dan geser lebih besar daripada 1,5 dan stabilitas terhadap daya dukungnya lebih kecil daripada daya dukung tanah yang diijinkan sehingga dinding penahan  aman terhadap bahaya kelongsoran.

The shear strength value is one of the important points in calculation of slope stability. One way to obtain the shear strength value is to do a direct shear test in laboratory. Like the cliff reinforcement study at Utama Mandala Uluwatu temple which is currently experiencing crack, it is necessary to test the shear strength of the limestone material at the cliff of the temple . There is no limestone testing equipment in the laboratory of the Civil Engineering Department, so that innovation is needed on the existing sliding test equipment. In this study innovation was carried out on how to test the soil shear strength so that it could be used to test the limestone shear strength. The test is done by moving two limestone surface that have been formed based on the mold tool which shape is circle. The shear strength slope at Uluwatu temple, which is currently experiencing crack in dry condition is . The shear strength value is used for calculating slope stability at Uluwatu Temple which is currently experiencing crack wich . The calculation used is curved slope stability by only calculate the life load and dead load. From the calculation of the stability of the slope, the safety factor is 1.15.