The response of long bolts in weathered and fractured granite under blasting was experimentally studied. The opening supported with long bolt and shotcret was chosen for the design, which was examined by monitoring stress states and particle vibrations round the opening during blasting. Borehole TV, sonic wave method and macro investigation were also used to determine fracture features post blasting. Neither falling rock nor bulging on bottom were found. The long bolt strengthened opening has proved to have good support effects and excellent response against blasting, compared with neighbouring unlined or short bolting opening.

The in-situ elastic wave tests and the main results of the quality of the grouting project for the foundation consolidation in Gezhou Dam construction site were presented. It has been shown that the in-situ elastic wave test is an advanced, efficacious and economical method to test and evaluate the quality of grouting project for foundation consolidation in important and large scale of hydroelectrical projects.

This paper investigates wave propagation and its interaction with discontinuities in media using numerical models which employ a finite difference method. The paper has two parts, the first of which considers wave propagation and scattering by simulating a compressive body source in a 2-D half-space containing a step or a slot on the surface, which represents a cliff or a rift valley that has dimensions of the order of the wavelength in the source. The second part of the paper reports a hybrid technique which combines a perturbation method and the finite difference method for wave propagation again caused by the body source in a 2-D half-space system but with a shallow surface obstacle, such as a smoothed ridge, with elastic constants slightly different from bulk material and the slops of the topography being shallow. This hybrid technique is also reported being applied to a half-space with a horizontal insert or void. Results obtained are of importance in both theoretical studies on wave propagation and interaction and applied researches on the analysis and isolation of the damage caused by seismic waves.

Strength and deformability of rock under cyclic loading were experimental studied. It was found that the strength under cyclic loading is lower than that under static loading, and that cyclic fatigure strength is related to amplitude and frequency. Also, it was found that the deformation of rock under fatigure loading is like that in creep test.

Offshore vane shear and penetration tests in situ were conducted in San Zao Bay near the pearl river mouth and systematic results of vane strength Cu and specific penetration resistance Ps were obtained. The specific penetration resistances and vane strength increase with the increase of depth, from which the formula, Cu = 0.0069h and Cu=0.0024Ps were derived. These conclusions provided the design bases for building the embankment in San Zao Bay. Also the method of offshore tests was improved according to the in-situ test conditions and a convenient and economical technique of offshore test for the similar engineering was given.

In this paper, strength theory of materials is researched according to the relative law of elastic and plastic deformations. A new strength theory is presented. There is a satisfactory coincidence between the theory and experiment results.

The measuring principle, structure feature, specificity criterion, error analysis and its application in-situ of tape WRM-4 extensometer are introduced in this paper.