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太兴铁路为山西西北部重要能源交通线,沿线黄土分布,其湿陷性对工程设计施工有着重要影响。以线路DK103+900~DK122+800段为研究对象,在黄土梁、黄土沟不同地貌处共挖得探井38个,探井内每米取2个Ⅰ级样,湿陷性试验采用双线压缩法。对照黄土常规物理力学试验,湿陷性黄土表现出大孔隙率、高压缩性。湿陷性计算表明,黄土梁部位湿陷性为Ⅱ级自重湿陷,黄土沟处黄土受流水改造大,湿陷程度低。工程挖填方引起路基上覆荷载变化,其湿陷程度也会发生变化。由此可见,结合试验和工程特点对其进行湿陷性评价,可为设计提供合理依据,有效减少工程投资,并且为以后类似工程提供参考。
Tai Hing Railway is an important energy transportation line in the northwestern part of Shanxi Province. Loess is distributed along the route. Its collapsibility has an important influence on the engineering design and construction. Taking line DK103 + 900 ~ DK122 + 800 as the research object, 38 exploration wells were drilled in loess and loess gully and 2 I grade per meter in the exploration well. The collapsibility test was conducted by two-line compression . Control loess conventional physical and mechanical tests, collapsible loess shows a large porosity, high compressibility. The collapsible calculation shows that the collapsibility of the loess beam is collapsed by gravity, and the loess by loess ditch is greatly transformed by the flowing water and the degree of collapsibility is low. Excavation and embankment caused by changes in the load on the subgrade, the degree of its collapse will change. Therefore, the collapsibility evaluation based on the characteristics of test and engineering can provide a reasonable basis for the design, effectively reduce the project investment, and provide reference for similar projects in the future.