Papers by Keyword: High Slope

Abstract: On the basis of different landform and multifarious topography in rugged mountainous area in southwest China, typical tunnel portals for single track tunnels in a new high speed railway line have been presented in the paper. The portal comprises headwall, shed tunnel, bridge abutment and its support. Portal with headwall is suitable for tunnel to resist front earth pressure on high and abrupt slope. Shed tunnel is placed in front of headwall so as to prevent rockfall; its outward part is built into a flared one. Meanwhile, the installation of bridge and its abutment are also included in the portal according to landform in the paper.

Abstract: For a nuclear power intake tunnel project, large-scale three-dimensional finite difference model is established by Flac3D to simulate the seismic response regularity of the entrance section of tunnel under the action of seismic waves schedule with the nonlinear dynamic analysis method. Through the input of the site seismic wave, the structure response characteristics of the tunnel entrance and slope are explored and duration curve of tunnel hole lining force under seismic waves action and tunnel lining figure can be obtained. The analysis results show that the anti-seismic weak parts of the tunnel entrance is at the location of tunnel spandrel and the sidewall. The analysis method and conclusions can be for reference in the seismic design of similar nuclear power intake tunnel project.

Abstract: The advantage outward joints connectivity rate (CR) which extend along the slope plays an important role to overall stability of the high rock slope, but less research on it has been done. In order to research the 180m high rock slope at water inlet of Wudongde hydropower station at Jinsha River, qualitative and quantitative analysis methods have been used. Based on the statistics of the outward joints CR which extend along the slope, and the weighted average parameters of the “bottom sliding surface” combined with the rock bridge, the stability factor of slope has been calculated by rigid body limit equilibrium method. According to the CR sensitivity analysis and calculation, the effect degrees of the joint connectivity rate to the slope stability, and the effect degrees of the bandwidth selection to the CR and stability factors in the bandwidth projection method of linear CR have been demonstrated in paper.

Abstract: The slope failure of high fill embankment have a large proportion under self-weight and external conditions,Because of the complexity of the soil deformation and stress,General methods such as the limit equilibrium and numerical analysis have their own limitations,The paper takes high fill subgrade engineering in Fujian province as the background.Adopting analytical method and finite element method calculate the stability coefficient and lateral displacement of high fill embankment slope.moreover,Making a comprehensive judgement to the stability of the slope by comparing with the actual value.The results show that calculation results of these two methods are close.Which can make accurate predictions on high slope stability and determine a judgement.and provides an effective method for the design and construction of the similar project.

Abstract: The target of this paper is to get proper information of deformation through monitor the health of a large-scale trial. The slope in the process of the governance and reinforced slope are designed in the test in Zhouqu County, Gansu Province. Through Health Monitoring Test to high slope, the teat is to master deformation and internal force changes of the supporting structure, meanwhile determine the trend of slope deformation. It is possible to send out the warning for slope stability. Through researching the program and analyzing the data of future monitoring, it provides a reliable basis of similar slope engineering for future.

Abstract: The stability analysis and evaluation on high slope is of great significance. The stability analysis on the slope of ZHANG-ZHUO highway is carried on in this paper by using the strength reduction method and ABAQUS software. According to the stress and plastic deformation calculated by ABAQUS software, the paper gives evaluations for the stability of slope. It turns out that safety factor of the slope is greater than three; the stability of the slope is well.

Abstract: Taking limit equilibrium calculation program SLIDE for the platform and establishing two-dimensional model of excavation slope. Based on unloading rock mass mechanics theory and method and considered the natural, excavation, reinforcement, water, rainfall, and other complex conditions to Study on the stability of slope during construction and operation, then using the outcome of the limit equilibrium method to give their assessment of slope stability. Analysis pointed out that : the high excavation slope basic in a stable state.

Abstract: The diversion power system intake excavation of Jinchuan Hydropower Station forms a slope of about 160m height; its stability is one of the main geological problems of the project. By detailed site investigation, the engineering geological characteristics of intake slope (including the lithology, slope structure, the structural surface and its combinations, rock weathering and unloading, hydrology etc) is analyzed in this paper. On the basis of site slope ratio statistics, the problem of how to select a safe and economic excavation slope ratio has been studied. The finite element method and rigid limit equilibrium method were used to calculate and analyze slope stability under various working conditions. The results of analysis evaluation provide a scientific basis for the design and construction.

Abstract: Highway high slope seismic stability is an urgent problem need to be solved, and the existing specifications can not meet the needs of engineering in design methods, construction measures and enforceability. Based on the earthquake failure mechanism of high slope, this paper analyzes the impact factors on highway high slope seismic stability, and puts forward earthquake preventive measures for high slope.

Abstract: Deep crack of high slope in the deep-cutting canyon region is a special geological phenomenon which exists in hydropower engineering in the west of China. High steep rock slopes are usually chosen as action sites of dam abutment. However, many deep cracks are often discovered in the depth of these high slopes. And irrefutably deep cracks greatly influence the stability of the engineering. By taking the deep cracks of left bank in Jinping I hydropower station as an example, formation mechanism of deep crack in high slope is partially revealed in this paper. Deep cracks were result of release of high geo-stress including body stress and tectonic stress when external environmental condition changed (such as river valley deep-cutting). Geometry and mechanics characteristics of discontinuous are internal factors result in the formation of deep cracks; deep cracks maybe have stepped-up process when combination of discontinuous is unfavorable; and intense release of high geo-stress caused by valley deep-cutting is external factor. In this paper, different combination of discontinuous was analyzed, and the formation process of deep cracks was simulated by DDA method. It concludes that the formation of deep cracks go through a series of complex process including river valley stress concentration caused by intense unloading - the high slope tension crack caused by horizontal stress release- part of the tension crack rock mass generates shear-tension crack downward along the slope under gravity”, etc. Research on this subject is a theory support for excavation and reinforcement of high slope where deep cracks exist.