The city of Semarang has a bearing capacity that varies according to the type of land. The phenomenon of land subsidence also occurs with the length of time that varies according to the load and type of soil. Bearing capacity of the land (BCL) has a relationship with land settlement and duration of decline (DOD). The study has been conducted in Semarang city by taking 448 undisturbed soil samples scattered in the study area. Soil sample analysis have been carried out in the laboratory to obtain the bearing capacity of land, land settlement, and duration of decline. Analysis of data bearing capacity of land, land settlement, and duration of decline were using the correlation-regression method to get the level of correlation between variables quantitatively. The results showed that there is a relationship between bearing capacity of the land to settlement and duration of decline for a type of clay, silt, silt-sand, and sand. In silt soil types, the relationship between the bearing capacity of the land to settlement is classified as low with a contribution of 9% due to inconsistent compressibility coefficient of soil volume (Mv) caused by grain size gradation, there are gaps and thickness of the potential sinking layer (deformation) is heterogenous. Also on sand silt soil types, the relationship between settlement and duration of decline has a very low level of correlation with a contribution of 9% due to the consolidation coefficient (Cv) is inconsistent because the mass density of sand material is heterogenous.

No abstract

Land stability is one of the main determining factors for the bearing capacity of the environment. The land stability is influenced by the condition and characteristics of the resources in the environment. The supply capacity in terms of the level of land stability for spatial use allocation has been based on the capacity of land for agriculture and the physical aspects of the land. It accordance with the local regulation i.e. no. 17 of 2009. Land stability includes the ability of land for agriculture and the physical aspects of land, as well as the stratigraphy of subsurface soil mass, especially geological characteristic. The research was conducted in Semarang City Indonesia by drilling and standard penetration test (SPT) and taking 448 undisturbed samples (UDS’s) of soil that scattered in the research area. Analysis of UDS’s have been carried out in the laboratory to obtain comparisons with SPT values in determining the level of land stability both vertically and horizontally. Soil types obtained are clay, silt, silt-sand, sand, and sand stone with a level of consistency and density in accordance with the measured SPT. Land stability values ranged from 0.201 kg/cm2-14.248 kg/cm2 covering all types of soil with different consistencies and density. The distribution of land stability is given in an infographic to get an overview of the land stability levels geographically at a depth of 2.5m, 5.0m, 7.5m, and 10.0m. This infographic can be useful for spatial evaluation, engineering guidance, and environmental research in Semarang City, Indonesia.

The bearing capacity of the land (BCL) is a determining factor for the bearing capacity of the environment. The BCL depends on the resources in the land space, which is called the supply capacity. The capacity of providing BCL for spatial use is determined by the stability of the landmass of the expanse of land, namely engineering geology characteristics. The BCL for the use of space has been based on the land capacity for agriculture and the physical land. There are important things that are not included in the criteria, namely the ability of the land in terms of engineering geology characteristics. Soil samples from the drill were analyzed for soil characteristics. Analysis of field and laboratory tests to get the distribution of the value of BCL, then compiled the map of the BCL of Semarang City at 2.5-5.0 m depth. The BCL value is 0.201–14.248 kg/cm2, settlement value is 0–247.728 cm, duration of decline (DOD) is 0 – 5.147 years. The paper intended to contribute to spatial planning policy thinking, related to the BCL based on engineering geology as a determinant of land capability, an evaluation instrument of space utilization, and fundamental policy formulation.