Pachystegia rufa and allied rock daisies : rarity and threats
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Name changes in the indigenous New Zealand flora, 1960–1986 and Nomina Nova IV, 1983–1986
Abstract Changes in the nomenclature of indigenous New Zealand angiosperms and gymnosperms since 1960 are listed, and commentary on some name changes is included. Names of new taxa published here are: Anaphalis keriensis (Cunn.) C. Webb, A. rupestris C. Webb, A. subrigida (Colenso) C. Webb, Brachyglottis kirkii (Kirk) C. Webb, B. kirkii var. angustior (Allan) C. Webb, B. turneri (Cheeseman) C. Webb, Chionochloa defracta Connor, C. lanea Connor, Convolvulus verecundus Petrie subsp. waitaha W. Sykes, Cortaderia turbaria Connor, Crassula hunua A.P. Druce, C. mataikona A.P. Druce, C. ruamahanga A.P. Druce, C. tetramera (Toelken) A.P. Druce et W.R. Sykes, Geniostoma rupestre Forst. et Forst. f. var. ligustrifolium (Cunn.) Conn, Gnaphalium polylepis (D. Drury) C. Webb, G. ruahinicum (D. Drury) C. Webb, Isolepis distigmatosa (C.B. Clarke) Edgar, Kunzea ericoides (A. Rich.) J. Thompson var. linearis (Kirk) W. Harris, K. ericoides var. microflora (G. Simpson) W. Harris, K. sinclairii (Kirk) W. Harris, Melicytus al...
Effect of stress conditions on collapse deformation behavior of a rockfill material
A set of saturated and dry-saturated large-scale triaxial tests were conducted in order to explore the effects of stress conditions on the saturation-induced collapse deformation behavior of a rockfill material. Specimens were tested in different confining pressures and for dry-saturated tests the specimens were submerged in various shear stress levels. The results indicate that in all of the dry-saturated tests a sudden reduction in the volume of the specimens was observed during the submerging process. The ratio of the minimum axial strength of a submerged specimen (at the end of the saturation process) to the shear strength of the specimen before saturation is defined as the coefficient of stress recovery, Csr. Results of the dry-saturated tests showed that this ratio increases as the confining pressure increases and decreases by increasing the shear stress level. According to the results of dry-saturated tests the values of internal friction angle reduction caused by saturation (Δϕc), the ratio of the elasticity modulus of the material after saturation to its elasticity modulus in dry condition, i.e., Ewet/Edry, and also the saturation induced sudden volumetric strain (εvc) decrease as the confining pressure increases. However the shear stress level does not have any meaningful effect on the variation of Dfc, Ewet/Edry and (εvc).