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膨胀岩具有遇水膨胀、软化、崩解和失水收缩、开裂等特性,一直是工程应用中的难点。通过新建云桂铁路膨胀岩的室内试验研究,分析研究了膨胀岩在不同含水率条件下的变形特征和变形过程,进一步建立了膨胀岩的修正Huder-Amberg本构变形模型;根据测定同一膨胀岩在不同含水率状态下的试验成果,分析了膨胀岩在不同含水率状态下的膨胀应变特征,绘制了含水率与膨胀应变的关系曲线,随着膨胀岩的含水率的增加,把膨胀岩的膨胀应变分为四个阶段,即①应变启动阶段;②应变稳定阶段;③应变加速阶段;④应变稳定阶段。进一步提出了膨胀岩的起始膨胀含水率,根据试验成果,当膨胀岩的含水率小于起始膨胀含水率时,膨胀应变量仅为饱和状态的5%,膨胀应变量很小。室内试验的研究成果,可为新建云桂铁路和类似工程的膨胀岩处理的设计和施工提供依据。
Expansive rock with water swelling, softening, disintegration and loss of water shrinkage, cracking and other characteristics, has been the engineering application of the difficulties. The deformation and deformation of expansive rock under different water cut rates were analyzed and studied through the laboratory test of newly built expansive rock of Yun-Gui Railway. A modified Huder-Amberg constitutive model of expansive rock was further established. Based on the analysis of the same expansive rock According to the test results under different water content conditions, the expansion strain of expansive rock under different water content is analyzed. The relationship between water content and expansion strain is plotted. With the increase of moisture content of expansive rock, Expansion strain is divided into four stages, namely ① start stage of strain; ② Stable stage of strain; ③ Strain acceleration stage; ④ Strain stabilization stage. According to the experimental results, when the moisture content of the expansive rock is less than the initial expansion moisture content, the expansion strain is only 5% of the saturated state, and the expansion strain is small. The research results of laboratory tests can provide the basis for the design and construction of expansive rock treatment for the new Yun-Gui Railway and similar projects.