EGB373-TUT 08-Week 09- Rate of Consolidation- Questions

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Queensland University of Technology *

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Civil Engineering

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Oct 30, 2023

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Queensland University of Technology QUT EGB373: Geotechnical Engineering EGB373: Geotechnical Engineering WEEK 9 - PRACTICE QUESTIONS – Time-dependent Consolidation Q1. Answer the following questions. (i) 2 / d v v H t c T , What is the definition of H d in this equation? (ii) Give typical units of T v (iii) Define the average degree of consolidation (iv) Mudstone has very low permeability, then why it has reasonably high coefficient of consolidation? Q2. A 3m thick clay layer is able to drain from both its upper and lower surfaces. After 3 years, a settlement of 32 mm is observed. After many years, a settlement of 40 mm is measured. If a specimen of this soil, 20 mm thick, is to be tested in an oedometer apparatus with two-way drainage what would be the time for 50% consolidation. Q3. A clay specimen, 15 mm thick, has been tested in an oedometer apparatus with two- way drainage, and it was observed that 50% of the consolidation settlement occurs in 1 hour. A layer of the same clay was observed to settle 10mm in 10 years and 35 mm after many years. Determine the thickness of the clay layer if it drains only from its upper surface. Q4. During an oedometer test on a specimen 20 mm thick with one way drainage the excess pore pressure was measured at the impermeable horizontal boundary. The measured relation between excess pore pressure and time is shown in Figure 1 for an increment in vertical stress of 100 kPa. By considering the excess pore pressure .at a given time, estimate c v . Use Figure 2 to obtain T v for corresponding degree of consolidation at the impermeable boundary. Figure 1 0 50 100 150 200 0 20 40 60 80 100 120 Time (minutes) Excess pore w ater pressure (kPa)
Queensland University of Technology QUT EGB373: Geotechnical Engineering Figure 2 z/H d v d m m z T M H Mz M U 2 0 exp sin 2 1
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