The design scheme and engineering construction technology are proposed for an accommodation highway subgrade on the basis of forming reasons and hazard analysis of saline soil in Xinjiang region. In the design, major measures adopted include basement replacement, setting aeolian sand layer and composite geotextile layer, strengthening the subgrade waterproofing and drainage, antiseptic treatment of structures, etc. This paper introduces the subgrade design and construction technology, of which the implementation and application on the test section have achieved a favorable effect and can be taken as the basis for design and construction of similar saline soil subgrade.
The large rigid foundation has a high requirement on subgrade consolidation deformation, especially the soft soil subgrade, of which the design and construction is very difficult. Through the analysis on subgrade treatment process of a sewage treatment plant in Zhejiang Province, this paper introduces the mathematical calculation model and the specific calculation method for treating the soft soil subgrade with the vacuum preloading method. The calculation results obtained has basically reflected the actual deformation process of the subgrade; it is a rational referential calculation method to guide the design and construction.
In consideration of few researches on model materials of soft rock tunnel model test, and the problems such as high price of raw material, difficult availability of materials in market, and weak universality existing in the materials which can be used as reference, this paper researches and develops the model materials with low price, wide source, and strong universality. The application result shows that the developed model materials can meet soft rock model test requirements, and they can be reused within 3 months.
Survey data show the problem of weak foundation existing in an accommodation highway. There are many methods to treat the soft foundation, and different methods have different expenses, effects and construction periods. Through the deep comparison of four foundation treatment programs, dynamic compaction method is taken for the design, and the detection result shows that the treatment effect reaches the engineering requirements.
It is well known that research on mechanical characteristics of the underground draft tube and corresponding stress distribution of the steel lining under complex conditions plays an important role on assessing the underground powerhouse and hydropower project safety. However, due to complex boundaries and load conditions of the draft tube, especially the concrete itself is so easy to crack, crush and become plastic that it is more difficult to determine its 3-Dimensional mechanical behavior of the underground draft tube. To better solve the above difficulties, 3-D FEM simulated model was built based on the universal software named Ansys to analyze the stress distribution of the draft tube structure and the steel lining. The calculation results showed that the hoop stress and radial stress of the tube were all satisfied with the standard requirement, and maximum stress of the steel lining also accorded with the strength requirement, which indicated that simulation model and the analysis method brought forward in the paper was applicable and practical, and also provided an effectie method for the underground structures design and steel arrangement of the draft tube.
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