Question

Problem 13. Refer to the triaxial shear test data (page below) to answer the following questions. a) What type of triaxial test was performed (CU, CD, or UU)? How can you tell? b) Samples of Soil 2 (see profile below) were obtained for the triaxial shear tests. Based on the results of the triaxial shear tests and the soil profile shown below, calculate the long-term shear strength of the soil at point A Soil 1: Soil 1 A 5 m above GWT), Yst-19.0 kN/m3 (below GWT) 3 m Soil 26m Soil 2 (Tnaxial data) a 18.5 kN/m c) If the elevation of the groundwater table decreased to point B, how would that affect the long-term shear strength of the soil at point A? Quantify your answer. Geotech Students, Inc. TRIAXIAL SHEAR TEST LABORATORY SERVICES Class Example USUCGER2017 Unknown soil 35 30 25 20 2 15 10 0 24 1214 Strane,% POINT-1 at 15 psi 0POINT-2 at 30 psi -POINT-3 at60 psa 50 Specimens Prepared at 90 Percent of Marum dry Density at +20% Optimum water content 40 20 10 12 Stone, % Effective Consolidation Stresses, psi Point : 15 Point 2 30 Point 3 60 Point Geotech Students, Inc. TRIAXIAL SHEAR TEST LABORATORY SERVICES Class Example USUCGER2017 Unknown soi 60 Efective. Sress 50 Total Stress 40 30 ら20 10 10 20 30 40 50 0 0 NORMAL STRESS, ps 10 120 EFFECTIVE STRESS: phi-27.8 c(psi)- 2 TOTAL STRESS:phi18.01

Answer 1

on Com poren rsoph of shear Stres and Nomnel stress aph ot ca, co,vu , we can s anel . hoe is increas c in ar wnen we increase. = 6.89 KN 27:8" , c: a PS: 8 그 66 KNİma 和ta) Shah Stoess C103 3 KNm て kN/ma 91.36

am Bm -981)x 4 (1 9981) 3 13.13 19871 n Ca go) 113. 54-KN/m2