Colin O'Loughlin’s scientific contributions

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Publications (2)

Table 2 . Shear strength parameters for NZ beech forest soils with and without competent roots
Figure 3. Fitted curves of peak shear stress vs total normal stress for field shear tests in the soil root zone; (a) beech forest (* -I? (b) clearfelled (0 --_--) l  
Table 3 . Results of studies of root strength factor AC
Figure 4. Curves of mean tensile strength vs time elapsed since tree felling for small roots of various conifer and hardwood trees,  
The Importance of Root Strength and Deterioration Rates Upon Edaphic Stability in Steepland Forests
  • Conference Paper
  • Full-text available

August 1982

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594 Reads

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86 Citations

Colin O'Loughlin

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Table 2 . Shear strength parameters for NZ beech forest soils with and without competent roots
Figure 3. Fitted curves of peak shear stress vs total normal stress for field shear tests in the soil root zone; (a) beech forest (* -I? (b) clearfelled (0 --_--) l  
Table 3 . Results of studies of root strength factor AC
Figure 4. Curves of mean tensile strength vs time elapsed since tree felling for small roots of various conifer and hardwood trees,  
RATES UPON EDAPHIC STABILITY IN STEEPLAND FORESTS

44 Reads

Colin O'Loughlin

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The additional strength provided by roots to the soil is generall yconsidered to be in the form of a cohesive strength hC which may range in magnitude from 1 kPa to 20 kPa. Studies of the tensile strength of tree roots show that small roots sampled from living trees range in mean tensile strength from about 10 MPa to about 60 MPa. After tree felling small roots lose their strength at average rates between 300 and 500 kPa per month. Root biomass also decreases rapidly after clearfelling. The reduction in K after forest removal is a prime cause of landsliding on many steep slopes.

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Citations (1)

... Soil shear strength is determined by cohesion, friction angle, and total stress on the shear surface (Zhang et al. 2001). Root reinforcement, represented as a function of the empirical root-soil interaction factor, root-area ratio, and root tensile strength (Waldron 1977;Wu et al. 1979), increases soil shear strength, commonly by increasing cohesion (O'loughlin and Ziemer 1982). Therefore, landslide susceptibility in forested areas is generally lower than that in other land-use types (Shu et al. 2019;Lusiana and Shinohara 2022). ...

Reference:

Quantifying effects of changes in forest age distribution on the landslide frequency in Japan
The Importance of Root Strength and Deterioration Rates Upon Edaphic Stability in Steepland Forests
Colin O'Loughlin

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