In this paper, the measurement technique and analysis method of ground vibration with various sources at iron and steel complex are described. The practical measurement cases of ground vibration excited by gas compressor, hammer, truck, train etc. at iron and steel complex are presented. The shapes of wave velocity, peak values, and the main frequency from measured point are listed. The measurement results point out that the velocity waves with different sources have different forms, which are mainly divided the wave forms into three types : the complex-steady-state wave, the shock wave, and the random wave, different main frequency spectrum, different peak values of velocity, and different decay law with distance from sources. The wave in three directions have different forms at each measured point with same seismic source, and their decay laws are different, too. The decay laws of vertical displacements caused by fallen-hammer with the distance from source quite fit in with the equation derivative by Bornitz.

The Vertical displacements on the crown during excavation is monitored with WRM-3 type extensometer. Successful prediction of extensive coupes in a shallow buried loess tunnel with a large span is made. The emphasis of this paper is put on the interpretation of the whole measuring process at borehole 2. The relations between displacement and excavation of the tunnel, relative displacements in the ground and the surface subsidence are discussed tentatively. The results indicate that monitoring vertical displacements under this engineering condition is very important to ensure the stability and safe excavation of the tunnel. Finally, some conclusions are drawn that the largest vertical displacement during the excavation of top part (about 1/3 height ) of the tunnel occurred when the working surface was in the distance of 1.2 tunnel diameters from the measuring hole and that the change of vertical displacements was small during the excavation of the low part, which was equal to 30—40% of the largest one.

In this paper, the superimposing principle and the theory of Mellin transforms are used to reduce the controlling equations and boundary conditions of linear cracks intersecting hole into dual integral equations in an infinite elastic body. With finite Hilbert transforms, the dual integral equations can be reduced into a Fredhole integral equation of the second kind which is related to S(t2 ). The dynamic stress intensity factor can be expressed with the solution of integral equation and its numerical results in obtained. In the particular case, the numerical results are the same as those in reference[2] . the intensity factor decreases with the propagation of cracks. With experiments, the propagation velocity of these linear cracks are measured.

The pressure cell installed under road is required to have the properties of durability and reliability for long-term usage. Usually it is considered unable to measure dynamic pressure, the distribution of dynamic pressures on railway subbase surface excited by train can be measured by the string-type pressure cells with a frequency detector by means of the probability-sampling method suggested in this paper. According to the philosophy of probability-sampling the probabilistic distribution (frequency distribution) curves of dynamic pressures are plotted to show the dynamic pressure distribution along the longitudinal direction of the railway approximately. The principle and method were successfully used and examined in the research on long-term monitoring of subgrade stability of the Qinghai-Tibet Railway in the Qarhan Salt-Lake region.

Various typical results are introduced of in-situ stress measurements by overcoming tests during last two decades. The stress cases could be divided into three types: in-situ stress in lower strength rock; in-situ stress in higher strength rocks; in-situ stress in high stress region. The involved rock masses were variety of Sedimentary rock, Igneous rock, and Metamorphic rock with yang’s modulus from 1 to 105GPa. The deepest borehole used for stress release was 90.7 m. Some general laws of initial stress in the shallow earth crust were drawn from the above results. The relationship between initial stress and yang’s modulus of rocks and the influence of initial stresses on rock engineering are discussed.

This paper summarizes and interprets the data observed from relative movement among crevices in Lianziya in the past seventeen years. The regularity of relative movement among crevices is obtained and the development tendency of dangerous rock masses is analyzed, which can be used to estimate the stability of Lianziya.

In this paper, the design method, working principle, and some problems of software and hardware of data processing system for rock and soil mechanics are discussed. This data processing system consists of model SSM-1 instrument multi-functions and PC-1500A microcomputer. The application of this system to soil triaxial shear tests is described.