Select the correct answer(s) to the statement, "disturbed soil samples cannot be used for" Select one: O a. classification b. stress history and soil compressibility O c. grain-size analysis d. specific gravity of soil solids
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- Since laboratory or field experiments are generally expensive and time consuming, geotechnical engineers often have to rely on empirical relationships to predict design parameters. Section 6.6 presents such relationships for predicting optimum moisture content and maximum dry unit weight. Let us use some of these equations and compare our results with known experimental data. The following table presents the results from laboratory compaction tests conducted on a wide range of fine-grained soils using various compactive efforts (E). Based on the soil data given in the table, determine the optimum moisture content and maximum dry unit weight using the empirical relationships presented in Section 6.6. a. Use the Osman et al. (2008) method [Eqs. (6.15) through (6.18)]. b. Use the Gurtug and Sridharan (2004) method [Eqs. (6.13) and (6.14)]. c. Use the Matteo et al. (2009) method [Eqs. (6.19) and (6.20)]. d. Plot the calculated wopt against the experimental wopt, and the calculated d(max) with the experimental d(max). Draw a 45 line of equality on each plot. e. Comment on the predictive capabilities of various methods. What can you say about the inherent nature of empirical models?Considering broad categories of soil types and commonly used soil sampling tools, please answer the following questions. What type of sampler is used to sample granular soils for Choose... laboratory testing? What type of sampler is used to sample cohesive soils for v Choose... laboratory testing? Thin-walled or Shelby tube sampler Split-barrel or split- spoon sampler Electric cone Split-spoon tesing er penetrometer onQ2. (a) You are given the following results from Atterberg Limits testing on a soil sample (PL= 23%, LL = 55%) collected from a boring on a local project site. The soil sample had natural moisture content of 56.3% prior to Atterberg Limits testing. If the soil is fine grained, what is the USCS Group Symbol (refer to Figure 2a) on page 7 for this soil and what does the natural moisture content result tell you about the soil in-situ (i.e. “in place")?
- Which of the following is part of the execution of the soil investigation? Select the correct response: Recommendation Laboratory test discussion and interpretation Determination of the depth of ground water table Analysis of data collectedConsidering broad categories of soil types and commonly used soil sampling tools, please answer the following questions. What type of sampler is used to sample granular soils for Thin-walled or Shelby tube sampler → laboratory testing? What type of sampler is used to sample cohesive soils for Choose... laboratory testing? v Choose... Thin-walled or Shelby tube sampler Split-barrel or split- Split-spoon samples are undisturbed and good for shear strer spoon sampler on testing. Electric cone penetrometerDiscuss the importance of grain size analysis tests in soils? What is the practical applications of performing grain size analysis in engineering practice? Why do we need to use oven dried soil samples in grain size analysis test?
- Q3- Deascribe the following with aids of sketches if necessary: i- How to determine the optimum moisture content of soil in lab. How to determine the soil porosity in lab. ii- iii- Why a pycnometr calibration has to be conducted for specific gravity test?Which of the following approaches to field investigation provides rapid, cost-effective site characterization with continuous soil profiling? Select one: a. Drilling soil borings and sampling soils using thin-walled (Shelby) tubes and standard penetration tests (SPTS). O b. Performing electric cone penetrometer test (CPT) soundings.00 docs.google.com/forms/ A It is easier than the sieve analysis CH soil is formed by chemical 1/1 weathering * True False Neither true nor false The grain size distribution has 0/2 been conducted on a soil sample and the following have been obtained: Percentage of passing from sieve number 200 is 47%, LL = 30%, PL = 15% Using the above information, the soil classification according to the USCS is * :O A5
- Which of the following is part of the report writing of the soil investigation? Select the correct response: Analysis and Discussion of data gathered Determination of depth of needed test pits Geophysical Exploration Laboratory testing of samples acquiredWhich of the following is not a principal method for investigating subsurface soil conditions? Drilling Test pits Seismic refraction O Electrical resistivityOne of the most widely known and used soil samplers is the standard split spoon. How?