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By B.T. Kang, A.N. Atta-Krah, L. Reynolds

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7i i l l u s t r a t e s a shallow-depth design which has been successful on powered as w e l l as f r e e - r o l l i n g wheels. Tyres must possess the c h a r a c t e r i s t i c s of d u r a b i l i t y , load c a r r y i n g a b i l i t y , speed c a p a b i l i t y and low operating temperature - t o the degree which service r e quirements demand. High t e n s i l e cord m a t e r i a l s must be used as reinforcement t o provide s u f f i c i e n t s t r e n g t h and f l e x i b i l i t y t o the t y r e s , and t y r e m a t e r i a l should be c h a r a c t e r i z e d by toughness and high abrasion r e s i s t a n c e and low heat generation during o p e r a t i o n .

78-126. , 1964. Properties o f snow. Cold Regions Science and Engineering, Part I I I , Engrg. Sect. Α . , Snow Engrg. S. Army M a t e r i a l Command, CRREL, pp. 528559. R. , 1976. AMC-74 Vehicle dynamics module. Tech. Rept. S. Army WES, Vicksburg, 76 p. , 1952. Suggested c l a s s i f i c a t i o n o f muskeg f o r the engineer. Eng. J . , 3 5 : 1 1 , pp. 1199-1210. , 1969. Muskeg as an engineering problem. Muskeg Engrg. Handbook, Ed. I . C . MacFarlane, U n i v e r s i t y o f Toronto Press, pp.

In consequence, the l i v e mat w i l l sink i n t o the peat l a y e r and a c o l l o i d o f amorphous f i n e organic material w i l l propagate to the s u r f a c e , thus c r e a t i n g the s i t u a t i o n f o r a lack o f t r a c t i o n . F i g . 15. Schematic r e p r e s e n t a t i o n o f f a i l u r e i n muskeg under loading a c t i o n . There are some f i e l d instruments a v a i l a b l e which can be used to " m o r e - o r - l e s s " evaluate the strength c h a r a c t e r i s t i c s and/or parameters o f a t e r r a i n f o r t r a f f i ­ c a b i l i t y purposes, such as p l a t e loading (Bekker, 1969), annular r i n g (Bekker, 1969), vane-shear ( I r w i n and Yong, 1980), cone penetrometer (Knight and Meyer, 1961), and vane-cone (Yong e t a l .

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