STABILITY OF CLAY SOILS

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Abstract
The method of assessing soil stability by means of moisture characteristics taken before and after artificial weathering is applied to Upper, Middle, and Lower Lias clays. The results are discussed with particular reference to mole drainage, and it is shown that the Upper and Lower Lias are almost as stable as a soil on Gault, which is known to be suitable mole-draining land. Some known drain failures are discussed, but the amt. of evidence yet collected is insufficient to allow us safely to interpret stability curves in border-line cases. A deep sample of London clay is shown to behave peculiarly in that it withstands the stresses of rapid wetting from the air-dry state and then disintegrates progressively over a period of days while undisturbed in the saturated state. The subsoiling of unstable clay soils requires as careful consideration as does mole draining.

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