Based on the analysis theory of plasticity limit, a formula of virtual work and an energy equation are established for the stability analysis of anchored soil slope, in which the soil nails and anchors are regarded as the internal structure which consumes the external power in the soil slope engineering.In the meantime, based on the simplified method of circular slip, another formula which can consider many factors such as the self-weight of slope, earthquake force, pressure of pore water and the force of anchor, is established to analyse the whole stability of anchored soil slope. It has important values for perfecting the analysis method of soil slope.

Methods of design and technological demands of construction are expounded for the structure with pre-stress tubular pile and anchor in the engineering of foundation pit. The design parameters for the pit are demonstrated by the means of FEM, and its feasibility is proved by the engineering practice. In the model of FEM, some pressure forces are imposed on the middle beam to simulate the anchor’s real mechanical properties. Taking into account the top ring beam and pre-stress tubular pile embedded each other very well, the straight beam element is adopted to simulate mechanical properties both of them. And the non-thickness interface element is also adopted to simulate the mechanical characteristics between the surrounding soil and the retaining structure, These experiences of design have important denotation for other similar foundation pit engineering.

According to the geotechnical conditions, A FEM model has been established to analyse the mechanical characteristics of the highway tunnel in the layered rock mass. In this model the layered rock mass and the soften joint are simulated by the transversal isotropic material, the interfaces between layers are simulated by the element of rotational Goodman interface, but the interface between the lining structure and surrounding mass is proposed to simulate by an interface element with thickness, and the supporting of tunnel is simulated by the straight beam element. In the meantime, based on the twin shear strength criterion, the mechanical characteristics of rock, the stiff matrix of element for the layered rock mass, soften joint and interface have been discussed. The analytical model has been demonstrated by comparing the results of layered surrounding rock-mass FEM with the test data in situ.

After have been analysed the initial dynamic cumulative damage mechanism of lining structure of the high speed railway tunnel,the conclusions have been gained that, under the effect of the long-term vibrating load of high speed train, When the damage energy accumulation reached a limit values, the damage zone caused by the initial crack which has been existed in the tunnel lining will be expansed further more. for the more, based on the accumulation damage theory linear elasticity and the analysis method dynamic finite element, The extension characters and calculation method of initail crack in the tunnel lining structures for the high railway have been proposed.

The bearing capacity of slime friction pile based on the Mohr-Coulombs strength criterion couldnt make full use of the potential strengths ability of rock-soil. But the double shear unified strength theory can depict really the bearing characteristics of rock-soil because it can consider the effect of intermediate principal stress comprehensively. On this condition, based on the Mindlins displacement solution and the double shear unified strength theory, a calculated formula of bearing capacity was proposed for the slime friction pile, and then the distribution regularities of lateral friction-resistance force for the slime friction pile were discussed.