This paper introduces the analysis of three dimensional finite element method for the gravity-arch dam building on the complex ground. The foundation rock of dip and strain-slip, three faults, two weak intercalations and etc. arc considered in this calculation model. Water static pressure, gravity of dam, uplift, temperature stress and so on are computed, including three dimensional osmotic and temperature fields in the foundation. The range of calculation model is about 1400×900×600m2 . There are 1845 elements of all kinds, 3280 nodes in the network of finite element. The superlax iterative method is used to solve, and three dimensional perspective and software of after treatment are applied in analyses. The dimension of this computation is large, various results of treating complex problems are reasonable. The important basis has applied to designing unit. The computation is important practical significance for Geheyan Dam which is being built.

This paper presents the variations of void ratios, compression coefficients, compression index and compression modulus of Xiamen muck with consolidated pressure at beginning. The second section describes the laws of coefficient of consolidation variation with pressure or void ratio. At last, it is discussed that the pressure secondary consolidation deformation develops with time at a given constant temperature and pressure. The ratio of secondary consolidation deformation to primary’s one, and quantitative relations between secondary consolidation deformation and pressure are described.

In order to determine behavior of Xiamen residual soil under cyclic loading, triaxial test with undrained conditions has been conducted in this paper. First, some important dynamic parameters such as strength, elastic modulus and damping ratio have been determined. Secondly, behavior of stress-strain, stress path and excess pore water pressure under cyclic loading has been analyzed. Finally, both the normalization and the determination of dynamic strength index ∅d and ?d for residual soil have been discussed.

In this paper, mineral composition, microstructure, cementing materials, physico-chemical properties of marine soil are systematically investigated and chemical composition of sea water are analysed. Soil samples for this study are obtained from three areas: Weizhou Island, Hainan Island, Nansa Islands in South China Sea. Experimental results indicate that the mineral composition of marine soil mainly consists of ellite, chlorite, kaolinite and quartz, the cementing materials contains free oxides, carbonate and organic matter, the variety of microstructure is also revealed. The properties mentioned above would be the main causes of special engineering characters of marine soil.

The use of geosynthetics in every domain of the geotechnical engineering is briefly introduced in this paper. The results and economic benefits obtained at present is also introduced with some engineering examples.

This paper analyses special engineering properties of marine soil and its cause from following points: deposit environments, lithofacies and after-sedimentation, and points out some problems for attention in soil engineering experiments of marine soil.

An improved method of stability analysis of the slope with soft clay layers was proposed in this paper. This method combines general slice method with the analysis of slip plane alone the soft layer, which can define safety coefficient reasonably and use computer easily in stability analysis of slope. The computational comparison of several different methods for a slope show that the proposed method is reasonable.

When soil mass is affected by environmental chemical factors for a long time, long-term stability of the soil mass will be changed. There is no method for forecasting the stability in engineering field before. In this paper, a scheme forecasting the stability of the soil mass is advanced. The scheme gives a method which combines chemical kinetics with mechanics. The theoretical basis of the method is also demonstrated in detail.

The interpolation of finite length sampled signals often result in savers distortion due to the leakage in spectrum caused by time domain truncation. In this paper a fast interpolation algorithm originated from the classical Whittaker Reconstruction is first derived. And basis transform is then introduced in extending Campbell Reconstruction to general finite length signals. Combining the above two measure presents a fast algorithm that effectively eliminate the defect of truncation. Analysis and tests shows that this new method can usually give satisfactory result.

BC4-1 multi-channels instantaneous signal acquiring apparatus was developed by our institute. In this paper, the apparatus has been introduced with its functions, technical targets. Operating modes and so on. During the process of developing this apparatus, we referenced the similar apparatuses in home and abroad, and also considered the characteristics of field measurements of geotechnical engineering, and therefore this apparatus has distinctive advantages, such as small volume, light weight, flexible power supply, simple and direct operating, and so on. We wish this apparatus will be admitted by the wide engineers and technicians.