Considering the limitations of terrain and engineering expenses, antislide piles are sometimes arranged in polylines. Studies show that this arrangement adversely affects the mechanical characteristics of antislide piles. However, there is no in-deep understanding of this issue and the structural design and calculation method of this arrangement have not been discussed in relevant standards. Aiming at resolving this shortcoming, the polylines pile arrangement is studied in this article to provide a scientific basis for designing and calculating antislide piles. To this end, the cantilever pile is taken as the research background, and the soil arching effect between piles is taken as the research object. Then the performances of the single-row polyline pile layout and straight line pile layout are analyzed in the Dawanjiang landslide and the results are verified from the aspects of the landslide reinforcement and the influence on the antislide pile structure. The obtained results show that the polyline pile layout is disadvantageous to the safety of the antislide pile structure, and the soil arch between piles under the polyline pile layout condition is not uniform. Meanwhile, it is found that as the polyline pile layout angle increases, the stress concentration appears at the “inflection point.” Under this circumstance, the soil arch between piles is not uniform, and the stress concentration intensifies.
Studies show that prestressed anchor cable antislide piles have good antiseismic characteristics. As an important parameter in the design of anchor-cable piles, the effect of anchor-cable inclination on the seismic response of the anchor-cable pile system has been rarely studied so far. In the present study, the seismic response characteristics of the anchor-pulled pile under different cable inclinations are studied using a large-scale seismic model test platform and numerical methods. The obtained results show that the inclined angle of the anchor cable has a great influence on the seismic response of the pile-anchor system. It is found that under the same seismic conditions, the axial force of the anchor cable becomes smaller as the anchor dip angle increases, while the pile top displacement becomes larger. The dynamic earth pressure behind the pile changes from the sliding surface to the pile top, indicating that the earth pressure near the sliding surface and the pile top is of active and passive earth pressure types, respectively. This pressure decreases with the increase of the anchor dip angle, thereby affecting the performance of the antisliding pile.
Objective: The paper aims to analyze the hydrogeological conditions of a proposed hazardous waste landfill and the migration characteristics of lead, zinc, and nickel in fractured aquifers and porous aquifers under accident conditions and provide a reference for the influence of the proposed landfill on groundwater. Method: In this study, based on a 1:50000 regional hydrogeological survey and 1:2000 site hydrogeological mapping, the hydrogeological conceptual model was established. Finite difference software GMS was used to analyze the migration characteristics. Results: The study demonstrated that when the pollutants in the hazardous waste landfill leaked, they migrated from northeast to southwest along the gully. The pollutants in the porous aquifer migrated quickly, and the polluted area expanded rapidly from point to surface. The pollutants migration in fractured aquifers was slow, and the groundwater quality was deteriorating continuously. During the simulation period, the pollutants of lead, zinc and nickel all polluted the aquifer. Among them, the lead pollution range w reported to be the largest, with an exceeding distance of 216.7m; the zinc pollution range was the smallest, with an exceeding distance of 33.3m, and the exceeding distance of nickel was 165.1m. Conclusion: In order to ensure the safety of the groundwater environment in the simulated area, the impervious treatment must be carried out according to the requirements of the proposed hazardous waste landfill. Meantime, an emergency plan should be formulated.
Objective: The paper aims to solve the problem of determining the sliding surface of soil landslide, and to provide the basis for landslide stability analysis and prevention engineering. Methods: In this paper, the sliding surface is determined by field exploration, and the sliding surface is comprehensively determined by FLAC3D numerical simulation method. At the same time, Sweden Arc Method and FLAC3D numerical simulation are used to make a comprehensive comparative analysis on the deformation and stability of the landslide. Results: The position of the sliding surface of dawanjiang landslide is determined by FLAC3D numerical simulation method, which is located in the eluvium and the maximum depth is about 7m, which is basically consistent with the speculated position. It provides a theoretical basis for landslide stability calculation and control engineering. Conclusions: In the determination of sliding surface and stability calculation of soil landslide, the comprehensive analysis combined with numerical simulation is the more reliable method.
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