石膏岩淡水浸泡软化试验研究
发布时间：2018-11-25 20:14
【摘要】：为了研究隧道施工过程中水对石膏岩的软化作用规律,以三叠系下统嘉陵江组地层中的石膏岩为研究对象,进行了不同时间的淡水浸泡软化试验研究,对石膏岩单轴抗压强度、抗剪强度、弹性模量以及泊松比随浸泡时间的变化规律进行分析。研究发现:随着浸泡时间的增长,石膏岩的单轴抗压强度、抗剪强度和弹性模量呈负指数下降趋势,而泊松比在一定条件下呈线性增加趋势;在损伤力学基础上,推导出了基于时间因素的石膏岩软化损伤演化方程,揭示了脆性系数与软化损伤变量之间的关系,建立了石膏岩在不同淡水浸泡时间下的软化深度模型,可用于判别穿越石膏层隧道开挖过程中围岩在地下水作用下的软化区域。
[Abstract]:In order to study the softening effect of water on gypsum rock during tunnel construction, taking gypsum rock in the formation of Lower Triassic Jialingjiang formation as the research object, the softening test of fresh water immersion in different time was carried out, and the uniaxial compressive strength of gypsum rock was studied. The variation of shear strength, elastic modulus and Poisson's ratio with soaking time was analyzed. It is found that the uniaxial compressive strength, shear strength and elastic modulus of gypsum rock decrease exponentially with the increase of soaking time, while Poisson's ratio increases linearly under certain conditions. On the basis of damage mechanics, the evolution equation of softening damage of gypsum rock based on time factor is derived, the relationship between brittle coefficient and softening damage variable is revealed, and the softening depth model of gypsum rock under different fresh water immersion time is established. It can be used to distinguish the softening area of surrounding rock under the action of groundwater during excavation of tunnel through gypsum layer.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;
【基金】：国家自然科学基金资助项目(No.51074198,No.51304256) 重庆市研究生科研创新项目资助(No.CYB15011)~~
【分类号】：TU45
本文编号：2357259
[Abstract]:In order to study the softening effect of water on gypsum rock during tunnel construction, taking gypsum rock in the formation of Lower Triassic Jialingjiang formation as the research object, the softening test of fresh water immersion in different time was carried out, and the uniaxial compressive strength of gypsum rock was studied. The variation of shear strength, elastic modulus and Poisson's ratio with soaking time was analyzed. It is found that the uniaxial compressive strength, shear strength and elastic modulus of gypsum rock decrease exponentially with the increase of soaking time, while Poisson's ratio increases linearly under certain conditions. On the basis of damage mechanics, the evolution equation of softening damage of gypsum rock based on time factor is derived, the relationship between brittle coefficient and softening damage variable is revealed, and the softening depth model of gypsum rock under different fresh water immersion time is established. It can be used to distinguish the softening area of surrounding rock under the action of groundwater during excavation of tunnel through gypsum layer.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;
【基金】：国家自然科学基金资助项目(No.51074198,No.51304256) 重庆市研究生科研创新项目资助(No.CYB15011)~~
【分类号】：TU45
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