Shear Box Test Lab Report

CAPE PENINSULA UNIVERSITY OF TECHNOLOGY

BELLVILLE CAMPUS

DEPARTMENT: CIVIL ENGINEERING

SHEAR BOX TEST

COMPILED BY: Ntombi Kongolo 211024503

SUBJECT: Geotechnical Engineering III

SUBJECT CODE: GET302S

LECTURER: P Neal

TECHNICIAN: L Minnies

GROUP: S4B

Signature : ___________

TABLE OF CONTENTS

GENERAL 3

HANDING OF PRACTICAL REPORT 4

INTRODUCTION 4

METHOD 5

RESULTS & GRAPHS 7

ANALYSIS 12

CONCLUSIONS 13

DISCUSSION AND RECOMMENDATIONS 13

REFERENCES 13

GENERAL HANDING OF PRACTICAL REPORT

INTRODUCTION

Shear Box test is an “angle of friction” test. The aim of the test is to determine the Shear Strength of a soil by sliding one portion of soil along another by increasing horizontal shearing force, while a constant load is

The upper half slides along the lower half by an increasing applied horizontal shearing force, while a constant load is applied perpendicular to the plane of movement. The relative displacement of the two portions of the specimen and the applied force are measured during the procedure so that a load v/s displacement curve can be drawn. METHOD

Apparatus

Stopwatch, Mixing Bowl and Balance. Shear box carriage, watertight, running on roller bearings; Shear box machine with electric motor and multi-speed driver unit, and load ring for measuring the horizontal shear force; Shear box body in two halves, the upper half fitted with a “swan-neck” yoke, and clamping and lifting screws; Loading pad, porous plates, perforated grid plates and retaining plate; Loading yoke, weight hanger and lever-arm; and

Method

Prepare the soil sample by adding small quantities of water and mixing until clay becomes stiff (take care not to make sample to wet);

Compact sample in a 60mm x 60mm x 20mm cutting ring. Assemble the shear box as indicated in Figure 1. Test specimen being the soil sample. Place the shear box in position in the carriage and adjust the worm drive unit and tailstock (by hand), so that contact is just

405 4.6 105 0.0033 318.15 95.71

420 4.8 106 0.0033 321.18 96.97

435 5.0 108 0.0033 327.24 99.16

TEST 2 Vertical Load (kg): 10 Normal Stress (kN/m2): 209.61 2 Test 2 10kg Area2 Horizontal Load Shear Stress

Time displacement Gauge Reading 0.06 x 0.05 sec mm Div Sample 2 (kN) Sample 2 (kN/m²)

15 0.1 34 0.0036 103.02 28.66

30 0.3 36 0.0036 109.08 30.45

45 0.4 42 0.0036 127.26 35.65

60 0.5 46 0.0036 139.38 39.17

75 0.7 49 0.0036 148.47 41.87

90 0.8 51 0.0036 154.53 43.65

105 0.9 56 0.0035 169.68 48.10

120 1.0 60 0.0035 181.80 51.71

135 1.2 63 0.0035 190.89 54.38

150 1.3 75 0.0035 227.25 64.97

165 1.4 83 0.0035 251.49 72.14

180 1.6 85 0.0035 257.55 74.14

195 1.7 104 0.0035 315.12 90.87

210 1.8 120 0.0035 363.60 105.21

225 2.0 129 0.0035 390.87 113.49

240 2.1 140 0.0035 424.20 123.60

255 2.2 148 0.0035 448.44 130.89

270 2.3 155 0.0035 469.65 137.57

285 2.5 160 0.0035 484.80 142.50

300 2.6 168 0.0034 509.04 149.89

315 2.7 170 0.0034 515.10 152.22

330 2.9 175 0.0034 530.25 157.25

345 3.0 0.0034

360

375

390

405

420

435

TEST 3 Vertical Load (kg): 15 Normal Stress (kN/m2): 419.22 3 Test 1 15kg Area3 Horizontal Load Shear