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- e) According to laboratory_testing results, the hydraulic conductivity (coefficient of permeability of < 1X10' cm/sec of a soil with up to 50 to 60% gravel (i.e. clayey silty gravel, GC-GM). Do you think this soil can be used as a landfill liner? Why and Why not?An MSW landfill has inactive cells covered with an intermediate cover of 1 m of sandy-loam soil. The soil is washed before use, thus it is at 100% field capacity when applied. The local 10-year average weather data is as follows. Month Precipitation ET in in Jan 7.8 3.1 Feb 7.1 3.4 Mar 6.0 4.4 Apr 3.3 5.1 May 1.1 6.3 Jun 1.1 7.0 Jul 1.1 7.4 Aug 1.5 6.9 Sep 4.0 5.8 Oct 5.0 4.8 Nov 5.5 3.6 Dec 7.0 3.0 Determine percolation (PER) through the intermediate cover in a 12-month starting from the month of July.The in situ moisture content of a soil is 18%, and the wet specific gravity is 17.5 kN/m3. The weight relative specificity of soil solids is 2.72. The soil must be excavated and transported to a construction site for use in a compacted landfill. If the specifications require that the soil is compacted with a specific compacted weight of “d comp” (see Table 1) and with the same 18% moisture content. Calculate how many cubic meters of soil must be removed from the borrow area to build a “V comp” volume compacted landfill (see Table 1). calculate also what would be the mass of water (in tons) that must be added to reach a humidity optimum of 23%.
- A sandy aquifer which underlies saturated stiff clay is under artesian water pressure.Water in the exploratory drill hole rose to a height of 9 meters. An open excavation was made in the saturated stiff clay for a landfill which lies above the sandy aquifer.Assuming the factor of safety is 1.5. What will be thickness of the stiff clay layer from the bottom of the excavation to the top of the sandy aquifer to ensure that the bottom of the excavation will not heave?(The unit weight of clay layer is 18.5KN/m3The MMDA in its previous study for a proposed sanitary land fill site in Cavite is planning to use a day liner for the landfill. Tests were performed on a sample clay from a borrow site. It was deemed necessary to have a minimum clay liner thickness of 0.30 m. The following results were obtained in the laboratory test Initial water lev! in standpipe... 96 cm. Final water level in standpipe... 56 cm. 12 mm Diameter of standpipe TRA Height of soil sample Diameter of soil sample Duration of test 114 Height of soil sample Diameter of soil sample The project manager would like to datermine the effectiveness of using on-site clay soils for the lining material if it is favorable. Teste were also performed on the on-site clay and the following results were obtained. Volume of water collected.... Constant head. Duration of test 10.2 cm. 5.4 cm. 12 hours. .... 8 cm. 5 cm. 75600 cm³ 60 cm. 1050 hours Compute the permeability of the borrow clay in cm/sec. a) b) Compute the permeability of the…Sand cone replacement test-method-was-conducted to-determine the density during the construction of the road base layer. The result.of the test is shown in Table 2(a) and 2(b). As a project engineer, you need to identify either the compaction effort for the construction of this road base layer comply or not to-the Specifications of Roadwork by Public Work Department (JKR 2008). According to the road-work-specifieation (JKR 2008), the road base layer must be compacted at-least 95% of Maximum Dry Density. Based on your finding, put your comment about the obtained result Q2 Table 2(a): Density test result Table 2(b): Moisture content test Mass of tray Mass of tray + soil Mass of tray + dry soil 1.65 g 2.65 g 2.50 g Bulk density, po 1939.67 kg/m3 Maximum Dry Density (MDD) 1760.00 kg/m3 Ans,Q3 NotQ2 Laboratory compaction is required to determine the relation of density and moisture content for road base layer. According to the standard roadwork specification (JKR, 2008), compaction test…
- 2-Calculate the settling velocity of the sandy materials present in the wastewater inside the grit removal chamber, if you know that the amount of discharge is 10,000 m3/ day, and the specific gravity of the sand particles is 2.3, and their diameter is 0.15 mm, CD= 0.4.8. In a landfill boundary plan for landfills using C soil, a volume of landfill of 3000 m3 is required with a void ratio (e) = 0.65. There are 4 quarry vendors described in the following table: Quarry A B с D Table 2. Price List of Landfill Quarry Pore Numbers(e) 0,85 1,2 0,95 0,75 Price (Rp/m^3) 45.000 37.000 42.000 40.000Explain how the compaction water content influences the shapes of SWCCs (e.g. air-entry value, residual suction value).
- What are the design goals for an engineered landfill• Problem 1- . Classify the soil to be used as a highway subgrade material using AASHTO classification system; Sieve No. No. 4 No. 10 No. 20 No. 40 No. 60 No. 140 No. 200 Size opening (mm) 4.75 2.00 0.850 0.425 0.250 0.140 0.075 % Finer 100 92 84 69 50 40 37 Liquid limit for soil passing # 40 sieve was determine to be 40% and plasticity index was 20%.Table 5.1 Classification of Highway Subgrade Materials The sieve analysis of ten soils and the liquid and plastic limits of the fraction passing through the No. 40 sieve are given below. Classify the soils using the AASHTO classification system and give the group indexes. General classification Granular materials (35% or less of total sample passing No. 200) А-1 A-2 Group classification Sieve analysis (percentage passing) А-1-а A-1-b A-3 A-2-4 A-2-5 A-2-6 A-2-7 No. 10 50 max. No. 40 30 max. 50 max. 51 min. No. 200 15 max. 25 max. 10 max. 35 max. 35 max. 35 max. 35 max. Sieve analysis (percent finer) Characteristics of fraction passing No. 40 Liquid limit Plasticity index Usual types of significant constituent materials General subgrade rating Soil No. Liquid limit Plastic limit No. 10 No. 40 No. 200 40 max. 41 min. 40 max. 41 min. 6 max. NP 10 max. 10 max. 11 min. 11 min. 1 98 80 50 38 29 Stone, fragments, gravel and sand Fine sand Silty or clayey gravel, and sand 2 100 92 80 56 23 3…