Strength characteristic of Zhangjiang clay

215A asperities and adjacent voids. Field scale measurements in boreholes at the Grimsel site in Switzerland are in qualitative agreement with laboratory data. 924077 Modelling interactive load-deformation and flow processes in soils, including unsaturated and swelling soils Richards, B G Proc 6th Australia-New Zealand Conference on Geomeclumics, Christchurch, 3-7 February 1992 P18-37. Publ New Zealand." New Zealand Geomechanics Society. 1992 A finite element computer code, the culmination of 25 years of development, is presented which can simulate load/deformation/ failure of soils coupled with simultaneous flow of water, solute, or heat. The conceptual model of the program and the processes are briefly outlined. Validation and use of the modelling techniques are described for a range of processes, including coupled flow in unsaturated and swelling soils. Case histories where this model was applied are illustrated: slope seepage in a soil with contrasting texture, landslides in fill slopes during rainstorms, and pressure due to swelling on a retaining wall. 924078 Laboratory approach to alleviate dynamic behaviour of rock structure Khair, A W Proc ISRM International Symposium on Static and Dynamic Considerations in Rock Engineering, Swaziland, 10-12 September 1990 P165-175. Publ Rotterdam: A A Balkema, 1990 Laboratory tests were carried out on different rock types, Barre granite, Indiana limestone, Berea sandstone, to examine their behaviour under compressive stress. The samples were tested using an electrohydraulic servo controlled testing machine with 100 tonne capacity. The failure processes of the specimens were studied using photographs taken during the tests. Based on these results, the pre- and post-failure states of these rocks were identified. The mode of failure of the rock and its strength were significantly influenced by the nature of the applied load and loading path. 924079 Geotechnical parameters of muds Ferreira Gomes, L M; Ladeira, F L Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, P1875-1878. Publ Rotterdam: A A Balkema, 1990 Results of laboratory tests conducted to determine geotechnical properties of the muds (clay) in Aveiro, Portugal, are given. The tests were carried out to better understand the clay properties and thus provide a sound basis for foundation design and other engineering works. The clay has the following properties: variable plasticity, always below line A in the plasticity chart; high moisture content; low dry unit weight; low shear strength; very low permeability; and low ultimate bearing capacity.

924080 Some geotechnical properties of Miocene Blue Clays in Campania (Southern Italy) Guadagno, F M Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, P1889-1893. Publ Rotterdam: A A Balkema, 1990 Laboratory tests to determine geotechnical properties and their influencing factors were carried out on samples from the Miocene Blue Clay outcrops near the city of Salerno. These

clays are characterized by the presence of primary and secondary discontinuities, and can be highly susceptible to landsliding and rapid weathering. Shear strength of intact,scaly and fractured samples is compared. 924O81 Contribution to the sta'~,~-str~ ~trengtia l~roF~rties of macroporous loess soil Markovic, G; Coric, S; Caki, L; Bozinovic, D Proc 6th International Congress Internatiomd Associution of Engineering Geology, Amsterdam, 6-10 August 1990 I/3, P1915-1920. Publ Rotterdam: A A Balkema, 1990 The stress-strain characteristics of macroporous loess that covers most of Belgrade were investigated to provide a geotechnical properties data base for foundation design and other engineering works. Triaxial consolidated drained compression tests on specimens consolidated under a large range of cell pressures were carried out on representative samples. Results show the existence of three types of loess, each with characteristic mechanical properties. A hyperbolic constitutive law represents the loess behaviour. 924082 Strength characteristic of Zhangjiang clay Tian, J H; Zhang, H Y Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, P2029-2035. Publ Rotterdam: A A Balkema, 1990 Zhangjiang clay is extensively deposited over the Leizhou Peninsula of China. The early Pleistocene river-delta deposits are tens of metres deep. Two distinct types of clay are seen: grey clay with clear microbedding and intercalated beds of fine silty sand, and variegated clay with compact texture and no microbedding. Shear characteristics are related to composition, moisture content, bind, and shear test method. Two distinct types of shear curve are seen, one with a distinct peak strength and the other with a gentler slope and no real peak.

924083 Evaluating the shearing properties for some Iraqi rock types, using different techniques Fattohi, Z R; Aziz, S V Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, P2163-2171. Publ Rotterdam: A A Balkema, 1990 The shear strength of limestone, mudstone, and marble rocks was measured using a portable shear box apparatus. Samples containing a discontinuity were cast in piaster such that they sheared along the pre-existing horizontal discontinuity. Shear force-displacement curves are shown. Shear strength parameters are calculated. Values are compared to those obtained from empirical relations with uniaxial compressive and tensile strengths. Correlation is reasonable, but controlled by the nature of the shearing surface. 924O84 Stress and behaviour of material under direct shear Iannacchione, A T; Vallejo, L E Rock Mechanics as a Multidisciplinary Science: Proc 32nd US Symposium, Norman, 10-12 July 1991 P549-558. Pubi Rotterdam: A A Balkema, 1991 The direct shear test is often used to measure the shear strength of geological materials. Because of the nonuniform conditions of stress and strain in this test, there is debate concerning strength calculations and failure processes involved. A finite difference numerical analysis of the direct shear test is presented to examine this problem. Effects of progressive failure within elastoplastic and strain softening materials on shear

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