SURFACE STRUCTURES:CONSTRUCTION 227A

Offshore structures

965299 Non-Ganssian approach for stochastic analysis of offshore structures S. Benfratello & G. Falsone, Journal of Engineering mechanics - ASCE, 121(11), 1995, pp 1173-1180. In this approach the fluid horizontal velocity is considered as a filtered white noise, and the actual load expression is replaced by a third-degree polynomial of this velocity. The tools needed to promptly obtain the filters parameters and the equations governing the response moments are also pre- sented: in particular, if the structure is sufficiently stiff, it is shown that these equations do not need any closure scheme in order to be solved. (Authors)

Slopes

colluvium material. It resulted primarily from excess piezo- metric pressures generated within the slope as a direct consequence of inadequate drainage. (from Authors)

965303 Optimization of slope angle of a lead-zinc mine V. K. Singh, D. G. Rao, M. Prasad & A. Sinha, Geotechnical & Geological Engineering, 13(3), 1995, pp 143-156. The present study represents an attempt to optimize the overall slope angle of a lead-zinc mine in Rajasthan state, which could extend to a depth of 170 m during the first phase of mining. Based on data, limit equilibrium and numerical simulation techniques were applied in order to assess the stability of the slopes and determine an optimum slope angle. From these investigations it has been inferred that the overall footwall and hangingwaU slopes should be 42 ° and 48 ° respectively. (from Authors)

965300 Modeling lateral sliding of slope due to Hquefaetion of sand layer X. Zeng & K. Arulanandan, Journal of Geotechnical Engineering - ASCE, 121(11), 1995, pp 814-816. The stability of a soil slope is analyzed based on the experimental results of a centrifuge tests. The failure mechanism recorded in the model test closely resembled that which occurred in the field. Excess pore pressure generated in a sand seam sandwiched between two silt layers contributed to the lateral sliding. The slope angle was significantly reduced after the simulated earthquake. The experimental results are in accordance with the lateral sliding observed at Valdez during the Alaska earthquake of 1964. (Authors)

965301 Experimental studies of caving a soft bench undercut at the base E. G. Chaikovskii, Journal of Mining Science, 31(2), 1995, pp 123-128; translated from: Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, 2, 1995, pp 50-55. Results are given in this article for studying undercutting of dense clay soils of categories I-III which are difficult to wash out and which are mainly worked by hydromechanization in open-cast mines of the Kuzbass. In carrying out the studies the problem was posed of determining parameters which characterize caving of these soils, the effect of production rate for the cut slot on the caving process, and the size limits for lumps of soil after caving. Factors which affect the caving process for a soil bench undercut at the base by a cut slope may be conditionally separated into three main groups: caused by physicomechanical properties of the soil being worked; connected with the geometric shape of the working head, dimensions and production rate for the cut slot; determined by the type of working head producing the cut slot and the nature of its effect on the soil mass. (from Journal translation)

965302 Investigation on the geological and geoteclmical factors leading to a major slope failure at a selected site on a Jordanian highway A. S. AI-Homoud, S. Taqieddin & S. Saket, Natural Hazards, 12(3), 1995, pp 203-224. During and after the very wet 1991/1992 winter experienced in Jordan, significant slope failures occurred along several sections of the new Irbid-Amman highway in Jordan. The topography over most of the route is hilly, and significant amounts of cut and fill were used to construct the highway. One such slope failure lies at 44+800 km. This paper deals with the overall stability of the slope at 44 + 800 kin. It presents the geological and geotechnical studies carried out at this site, identifies the causes and mechanism of instability, and presents appropriate remedial measures. The study concluded that the landslide movement occurred within the

Construction methods

9653O4 Deep and high in Hawaii G. Y. K. Chock, Civil Engineering- ASCE, 65(11), 1995, pp 42-45. The First Hawaiian Center, headquarters of the First Hawaiian Bank, will be the tallest building in Hawaii when it is completed. The unusual design, posed some structural engineering constraints. The building's foundation was also a challenge, because of the basement depth of 45 ft below mean sea level and the marine environment. A perimeter soil-mixed wall was installed and dewatering proceeded while the five- story basement and the tower structure were being con- structed. (from Author)

965305 Roller compacted dam concrete (RCD) technology B. J. Selva Mora, Individual Studies by Participants at the International Institute of Seismology and Earthquake En- gineering, 31, 1995, pp 201-216. Roller compacted concrete dams have the advantages of economical and rapid construction of embankment dams and structural reliability of concrete dams. The concrete is placed in continuous layers and is consolidated by vibrating rollers. Conventional concrete is placed in isolated monoliths and consolidated by immersion vibrators. RCC and RCD methods are characterized by reduced labor costs, continuous construction, shortened construction periods and cement content savings. (from Author)

9653O6 Dam construction and utility corridor relocation in pit at Syncrude Canada Ltd L. Piciacchia, J. MacNeil, R. Cameron & C. Ashton, CIM Bulletin, 88(993), 1995, pp 45-49. The in pit dam, is 2.5 km long, 63 m high and has 42 million m 3 of engineered soil added to the already existing end- dumped soil volumes. To complete the design and construc- tion of a structure of this magnitude, in the very short time frame of two-and-a-half years. The main challenges faced were: designing while construction was ongoing; designing without the use of clay cores or sand filters; using relatively non-select overburden material; proper dewatering and base preparation; changing from construction of 50 m high spoil piles to a high specification construction operation; com- pacting lifts with heavy haulers; constructing during the winter; and monitoring movement of the structure with satellites. (from Authors)