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Question 1 Figure Q1a shows the cross section through a site at which it is proposed to lower, for 8 months, the groundw
Posted: Mon Apr 25, 2022 8:59 am
by answerhappygod
- Question 1 Figure Q1a Shows The Cross Section Through A Site At Which It Is Proposed To Lower For 8 Months The Groundw 1 (39.88 KiB) Viewed 44 times
- Question 1 Figure Q1a Shows The Cross Section Through A Site At Which It Is Proposed To Lower For 8 Months The Groundw 2 (33.72 KiB) Viewed 44 times
Question 1 Figure Q1a shows the cross section through a site at which it is proposed to lower, for 8 months, the groundwater level by 2m as indicated. Figures Q1b and 1c show the results of an oedometer test carried out on a sample of the clay strata. a) Calculate the change in effective stress in the centre of the clay strata due to the lowering of the ground water. 10 marks b) Calculate the magnitude of the settlement caused by consolidation due to the change in stress. 15 marks c) How much of this settlement will be complete after 8months? 15 marks Depth (m) 0 # 1 Original GWL Yunsat = 19kN/m ..Yot - 20kN/m --Final GWL Sand 3 4 Clay Ysat = 18kN/m 10- Sand and Gravel Figure Q1a
20 19.8 19.6 1 19.4 Height of sample (mm) 19.2 19 18.8 18.6 18.4 10 100 1000 Effective vertical stress (kPa) Figure Q1b 18 17.5 17 Height of sample (mm) 16.5 16 15.5 0 0 1 2 2 3 4 5 on 00 10 11 12 13 14 15 6 Square root of time (mins)