Studi Kapasitas Lateral Pondasi Tiang Ujung Bebas Dengan Variasi Diameter Dan Jarak Beban Sampai Muka Tanah Pada Tanah Pasir Di Laboratorium

The aim of this research is to study behavior of single free-end pile under lateral loads due to various of diameters and distance load from ground surface in cohesion less soil. The research was conducted through experimental in laboratory. Three various of diameters are: 1cm, 1.25cm and 1.5cm are used, and five various of distance load from ground surface are: 15cm, 17.5cm, 20cm, 22.5cm and 25cm. The value of ultimate lateral capacity (Pu) is determined by using interpretation method and compared to Brom's analysis method. The result of this this research is that value of the lateral capacity will increase with increasing of diameters, but it will decrease while distance load from ground surface increase

Efektivitas Injeksi Larutan Kapur Untuk Menurunkan Plastisitas Tanah Lempung Sebagai Upaya Mengatasi Kerusakan Jalan Raya

Highway built on high plasticity clay will be easily damaged by groundshrinkage flower essence. Stabilization of clayby mixing lime is a repairement method that has been proven quite effective. However, this method is difficult to be applied in existing road because demolition must be done. Stabilization of clay using lime solution injection is the method proposed toovercome the problems of expansive clay under the existing highway, therefore demolition is not required. This study was conducted to obtain effective parameters influencing the distance lime solution injection sites and time required for complete stabilization process. This research was conductedin labotarorium by injection experiments. Test results shows indications of soil plasticity decrease, especially the value of plasticity index (PI) and liquid limit (LL). PI decreases from 24.74% to 19.5% and LL decrease from 52.32% to 45%. Based on data analysis it appears that the time required for complete lime solution injection (effective time) has not been obtained in this test. Based on test data, until the day 28 value of soil plasticity index is still low. In this study obtained effective distance influencing the injectionsolution of lime is 100 cm. The distance is still need to be enlarged by increasing the high pressure

Tinjauan Kekuatan Sistem Penyangga Terowongan Dengan Menggunakan Metode Elemen Hingga

In the developing countries like Indonesia, especially in the big cities like Jakarta, tunnel constructions should be considered to solve traffic problems. Besides, geological and topographical condition in Indonesia that is rich of mine materials making tunnel construction will be developed in the future. But then, to the present time, there are too many cases of failure of tunnel construction in several countries. This failure caused by supporting system of tunnel doesn't capable to support the construction. Based on this phenomenon, it was necessary to research about review of supporting system strength of tunnel construction.Stability analysis of mine tunnel that belongs to P.T. Aneka Tambang Tbk, located in Pongkor Mountain, Bogor, West Java, would be done in this research. This analysis was conducted with numerical method using plaxis 3D tunnel software. Slice of tunnel along 15 meters of length will be analyzed in this research. This slice would be divided into three step of excavation. Mohr Coloumb material model were used in soil material. Whereas linear elastic model were used in other materials likes shotcrete, rock bolt and steel sets. Three variation conditions of tunnels would be considered in this research namely tunnel without supporting system, tunnel with original supporting system (same as in the research location), and tunnel with Q system supporting system. In this research, examination would be done for the change of displacement of the tunnel construction in consequence of the three conditions above.The results of this research show that the installation of supporting system reduced displacement of the tunnel significantly. Average decreasing of displacement value as a result of the original supporting system is 12.5 cm (46.30 %). Whereas, average decreasing of displacement as a result of the Q system supporting system is 9.25 cm (34.26%). Although not as strength as original supporting system, the Q system supporting system deserves to be considered in supporting system analysis

Pengaruh Variasi Diameter Kolom Kapur Untuk Stabilisasi Lempung Lunak Pada Tinjauan Nilai Indeks Pemampatan Tanah (Cc)

Mostly soil in java, especially in northern area is included in soft clay soil classification. The behavior of this soil, have large value of coefficient compression (Cc), so consolidation settlement potentially occur in this soil. In this research, this problem will be handled by limes column. Limes columns were expected could reduce Cc value so consolidation settlement could be reduced too. This research was conducted through experimental in laboratory, with box that have 40 cm in diameters and this heights is 40 cm. Five various of diameters applied in this research and this affect to value of Cc would be examined. Those are 3 cm, 5 cm, 8 cm, 10 cm and 12 cm diameters.The result of this research show that limes column could reduce of Cc in significant value. The average change of Cc with limes column is 0,095 (37,63 %) if compare with Cc without limes column stabilization. The results also show that increasing of limes column diameters have no affects to the value of coefficient compression

Analisis Penanggulangan Kelongsoran Tanah Pada Ruas Jalan Gunung Tugel Patikraja Banyumas

Gunung Tugel is an area that located Patikraja Region, Southern Banyumas. Thetopography of the area is mostly mountainous with a slope that varies from flat to steep. Thiscondition makes to many areas of this region potentially landslide. In 2015, a landslideoccurred in Jalan Gunung Tugel. The Landslide occurred along 70 meters on the half of theroad and causing traffic Patikraja-Purwokerto disturbed. To repair the damage of the road andavoid further landslides, necessary to analyze slope stability. This study is to analyze landslidereinforcement that occurred at Gunung Tugel and divides into 3 step. The first step is fieldinvestigation to determine the condition of the location and dimensions of landslides. Thesecond step is to know the soil parameters and analyzes data were obtained from the field. Andthe final step is analyzed of the landslide reinforcement by using data obtained from thepreceding step. In this research, will be applied three variations of reinforcement i.e. retainingwall, pile foundation and combine both of pile foundations and retaining wall. Slope stabilityanalysis was conducted using limit equilibrium method. Based on the analysis conducted onthe three variations reinforcement, combine both of pile foundations and retaining wall morerecommended. Application of and combine both of pile foundations and retaining wall is themost realistic option in consideration of ease of implementation at the field. From thecalculations have been done, in order to achieve stable conditions need retaining wall withdimensions of 2 meters high with 2,5 meters of width. DPT is supported by two piles of eachcross-section with 0.3 meters of diameter along 10 meters with 1-meter in space

Studi Pengaruh Stabilisasi Tanah Lempung Lunak Menggunakan Kolom Kapur Terhadap Parameter Kecepatan Penurunan Tanah

Soft clay is kind of problem in building and highway foundation design. This type of soils, have low coefficient consolidation (Cv) parameter. This condition will cause that soils have very long duration in consolidation process. Limes column stabilization method can be applicable to solve this problem.This research be conducted to analyzed coefficient consolidation behavior in limes column stabilization method. The change variety of coefficient consolidation w ill be observe due to variation of limes column diameter. The limes column stabilization method be wished to increase the value of coefficient consolidation so settlement process of the soil get more rapidly. This research was conducted through experimentalin laboratory, with box that have 40 cm in diameters and this height is 40 cm. Five various of diameters applied in this research and this affect to value of Cv would be examined. Those are 3 cm, 5 cm, 8 cm, 10 cm and 12 cm diameters The result of this research show that limes column could increasing the value of coefficient consolidation. The average change of Cv is 0,000051 (6,38 %) compare w i th Cv without limes column stabilization. However, increasing of limes column diameters have no significant affects to the value of coefficient consolidation