發(fā)布時(shí)間：2018-11-25 20:14

【摘要】：為了研究隧道施工過程中水對(duì)石膏巖的軟化作用規(guī)律,以三疊系下統(tǒng)嘉陵江組地層中的石膏巖為研究對(duì)象,進(jìn)行了不同時(shí)間的淡水浸泡軟化試驗(yàn)研究,對(duì)石膏巖單軸抗壓強(qiáng)度、抗剪強(qiáng)度、彈性模量以及泊松比隨浸泡時(shí)間的變化規(guī)律進(jìn)行分析。研究發(fā)現(xiàn):隨著浸泡時(shí)間的增長(zhǎng),石膏巖的單軸抗壓強(qiáng)度、抗剪強(qiáng)度和彈性模量呈負(fù)指數(shù)下降趨勢(shì),而泊松比在一定條件下呈線性增加趨勢(shì);在損傷力學(xué)基礎(chǔ)上,推導(dǎo)出了基于時(shí)間因素的石膏巖軟化損傷演化方程,揭示了脆性系數(shù)與軟化損傷變量之間的關(guān)系,建立了石膏巖在不同淡水浸泡時(shí)間下的軟化深度模型,可用于判別穿越石膏層隧道開挖過程中圍巖在地下水作用下的軟化區(qū)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.
【作者單位】： 重慶大學(xué)煤礦災(zāi)害動(dòng)力學(xué)與控制國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(No.51074198,No.51304256) 重慶市研究生科研創(chuàng)新項(xiàng)目資助(No.CYB15011)~~
【分類號(hào)】：TU45

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