2. Results of current study:

The results of nine such tests are summarised in table 5.

2) Dynamic testing:

• Two trees were dynamically tested in Ballyfarnon forest, Co. Sligo, Ireland.
• One each from the double mould board plot and the mole plot were tested
• The test trees were not flooded on this occasion

The main results are given below:

• The pore water pressure began to accumulate in the case of the double mouldboard tree when the moments reached about 10kNm
• The rise was sufficient for pumping liquefaction to occur
• In the case of the mole tree a comparatively small increase in pore water pressure was noted, the increase beginning when the bending moment reached about 9kNm
• No pumping or liquefaction was noted in the case of the mole tree
• The DMB plot tree suffered a considerably greater reduction in stiffness and increase in damping than was the case for the mole plot tree.

1. Laboratory Testing:

To date laboratory testing has been limited mainly to classification testing. The following section outlines the main findings to date:

1. Natural moisture content

This was determined to be as folows on the 20^th April 1996.

Topsoil, Wn = 49.11%

Gleysol, Wn = 33.3%

1. Atterberg Limits

Tosoil; Plastic Limit = 46%

Liquid Limit = 77.2%

This gives a value for the plasticity index of
Ip = 31.2%

1. Gleysol: Plastic Limit = 27.9%

Liquid Limit = 52.8
Therefore Ip = 24.9%

1. Estimates of in-situ density

The in-situ density of the Ballyfarnon soil was estimated by taking good quality samples using Pf suction sample tubes. Results in Table 6.