Civil Engineering Reference
In-Depth Information
(iii) Plot pore water pressure against strain.
(iv) Plot the variation of the pore pressure coefficient A with strain.
Answer
(i) 0.6
Exercise 4.7
The following results were obtained from a shear box test carried out on a set of
soil samples. The apparatus made use of a proving ring to measure the shear forces.
Normal load (kN)
0.2
0.4
0.6
Proving ring dial gauge
readings (no. of divisions)
Strain (%)
1
8.5
16.5
28.0
2
16.0
27.0
39.0
3
22.5
34.9
46.8
4
27.5
39.9
52.3
5
31.3
45.0
56.6
6
33.4
46.0
59.7
7
33.4
47.6
61.7
8
33.4
47.6
62.7
9
47.6
62.7
10
62.7
The cross-sectional area of the box was 3600 mm
2
and one division of the proving
ring dial gauge equalled 0.01 mm. The calibration of the proving ring was 0.01 mm
deflection equalled 8.4 N.
Determine the strength parameters of the soil.
Answer
φ
′
=
32°; c
′
=
43 kPa
