an engineering geological characterisation of tropical clays - GBV

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Maximum shear stress / Normal stress:
black clays & red soils
300,0
250,0
200,0
Shear stress at failure [kN/m²]
150,0
100,0
50,0
0,0
0,0 100,0 200,0 300,0 400,0 500,0 600,0
Normal stress [kN/m²]
SA2-70cm (black clays) SB1-30cm (black clays) SC1-30cm (black clays)
SD7-50cm (black clays) RD1-100cm (red soils) RD1-30cm (red soils)
RD1-400cm (red soils)
Figure 7.5. Coulomb/ shear failure envelopes for black clays and red soils in this study.
Plotting of drained peak values of shear stress against normal stress (failure envelopes) was
done on the same diagram, both for black clays and red soils (Fig. 7.5).
Possible engineering implications of shear strength and/ or shear strength parameters of soils
on construction practice are discussed under a relevant section in the next chapter.
7.3.4 Evaluation and analysis of results
The possible forms of relationship between shear parameters (cohesion, angle of shear
resistance) measured on undisturbed samples and index properties of black clays are