Stability Evaluation Research On Jointed Rock Slopes Under High Buildings

With the increasing of safety requirements of construction projects and the height of buildings, some mountainous cities tend to develop the real estate on slopes. The slope may produce large deformation or collapse because of high-rise buildings. Therefore, the effects that the slope and construction have to each other are more and more significant.This paper takes the slope as the object of study to discuss and analyze the effect that the high-rise building have to the slope and failure pattern of the slope with structural surface. It combines in-situ test, theoretical analysis and numerical simulation. Besides, the author proposes a evaluation method for slopes with high-rise building and structural surface. The main contents are as follows:First, this paper analyses the terrain, landform and the distribution of structural surface around the area for the project on the basis of the exploration and drilling data. In order to meet the demand of the project, this paper chooses some appropriate points to carry out in-situ direct shear test, and raises a convenient and economical method for the test. Not only some field tests, but also FLAC3D is used to compare the two methods. They all prove that the new in-situ shear test is feasible.Second, on the basis of some failure modes for rock slope with structural surface, corresponding models for slope instability mechanism are established. This paper analyses the effects that the structural surface have to strength and stability of slope rock mass using corresponding mechanical theory, and inferences and proofs the failure mechanism for slope with structural surface based on strength theory and potential slip plane theory.Third, because the slope and high-rise building have great effects to each other, this paper discusses the effects that the relative position, magnitude of loads and the width of the foundation have to the stability of the slope, which shows that they are closely related.Fourth, this paper raises Mohr-Coulomb equivalent area circle yield criterion after analyzing some common yield criterions in geotechnical engineering. The research shows that it has higher calculation accuracy to adopt Mohr-Coulomb equivalent area circle yield criterion in plane strain state, and it has distinctive advantages to utilize Mohr-Coulomb equivalent area circle yield criterion instead of Mohr-Coulomb unequal angle hexagon yield criterion.Finally, ANSYS is utilized to analyze and evaluate the stability of the slope. Strength reduction method is used to reduce the soil parameters, such as cφ, and safety factor is calculated to be the evaluation basis. The calculation shows that the method for evaluating stability of slopes proposed in this paper is viable.