In this paper the incremental nonlinear models are generally discussed, the correlation of this sort of models with others and the difference between them are interpreted, and some basic concepts are clarified. We presented a nonlinear dilatant stress-strain model for soil, which is referred to as KKG model for the sake of simplicity. The experimental results of a sand sample are used to determine the moduli for the following models KKG, KG (the deformation model), and Eν (elastoplastic model) respectively. The comparison of the calculation values of these models with the associated experimental results shows good fittings and prediction of KKG model, and its good simulation of soil dilatant behaviour in particular. The predicted pore pressure and effective stress path have a reasonably good agreement with observed results as well.

In this paper we present the principle and technique for measuring velocity of elastic waves in the bedrock with deep holes, and the effective watertight and pressure-proof measures taken. Using this method, the measurement in the bedrock of the reactor of a nuclear power station with holes (120m in depth) are completed with the anticipated results. The data, processed and analysed, have been provided for the construction of the above-mentioned nuclear power station.

The double Column block method applies to solute of large sparse linear simultaneous equations in finite element analysis. At present the portioned triangular decomposition method is generally used for solving large systems of linear equations in FE. With the partition of the coefficient matrix dependent on its bandwidth, the solution of problems with a large bandwidth is restricted owing to the computer core storage and hence it is difficult for this method to solve some large-scal FE problems, especially the three-dimensional problems. This difficulty has been overcome by the double column block method, completely independent of the bandwidth, by means of our method the coefficient matrix is partitioned according to computer core storage capacity. It is proved that this approach is successful and effective. Based on this method, the solution has been completed of the three-dimensional FE problem with 124 twenty-node and 8 sixteen-node isoparametric elements, and 831 nodes, having a maximum half-bandwidth of 1746 and global stiffness matrix storage of more than 5000 K bytes. The computation was performed on PE-3220 minicomputer and only a core storage of 685 K bytes was used. The double column block method makes it possible for minicomputer and high-level microcomputer to be applied to calculations in large-scale FE problems.

Based on the fundamental conception soil mechanics, by experimental research, the relation of the coefficient of permeability K to the void ratio e and that of the coefficient of compression aγ to the effective consolidation pressureσ’ are first expressed for normally consolidation clays. Hences the expression of relation of the consolidation coefficient cν to the void ratio e or the effective consolidation pressures is given. There are three typical cases of variation of the consolidation coefficient for different soils types, i.e. the value Cν decreases with the void ratio’s decrease; the value Cν increases with the void ratio’s decrease and the value Cν is essentially independent of the void ratio. Specific variation of the value Cν for specifically soil type is pointed out. The physical foundation for the variation of consolidation index m is explained. The relationships between the value m, the effective consolidation pressure σ’ and the soil layer thickness H are discussed. Finally, correlation between the value Cν and m’s variation as well as the noteworthy problems in practice are represented.

The present paper introduces the design and construction of a multistorey brick building on a marine sedimentary soft clay foundation by means of Combination of sand cushion and sand drain, with no load increment applied before the upper structure’s construction. The building, the construction of which began in the summer, 1979 and ended in the winter, 1981,is in good condition during the recent three years, no abnormal deformation being found. With its advantage of simplicity and economy the construction is an example for successful application of soft clay foundation treatment of this sort in the building construction.

This report studies the effect of vibration on shear strength on the interface between concrete and bedrock, which is prepared for Gezhouba Dam key water control project. A set of in-situ tests were carried out in the following way: the vibration load was applied besides the statically load and shear tests were conducted in the course of vibration. The test results show that the peak value of f is decreased by 15% due to the vibration effect.

In order to investigate the influence of blast driving of the people’s air defence tunnel on a TV tower being under construction, we have measured vibration velocity of the TV tower, cornerstone and the tunnel. In this paper the TV tower is regarded as a protruding high edifice which is under construction, the assessment and analysis of the failure criteria have been given. The analysis and conclusion may contribute as a instructive reference for some similar engineering.

The two-signal transducer is made on the basis of the velocity transducer type 65. It can output two different signals, displacement and velocity, simultaneously. The velocity signal is generated through interaction of the magnetic core with the coil, the displacement signal by means of LVDT. It has a high sensitivity and measurement range of 2~50Hz.

The shock of stress waves causes deformation in intact medium, the form of new cracks and finally the failure in the material. The preexisting cracks not only help increase fracture efficiency but also absorb the energy of the stress wave to induce a decay of its propagation. Therefore the study of interaction of Stress waves with cracks will greatly contribute to the interpretation of blasting mechanism, the stress wave propagation and the dynamic behaviour of material. Our emphasis is laid on interaction of stress wave with cracks, and the influence of cracks on attenuation of the wave propagation. A view is made of the current state of model calculation and experimental technique carried out in this field.