發(fā)布時(shí)間：2018-02-10 04:28

  本文關(guān)鍵詞： 碳酸鹽巖 模擬酸雨 溶蝕機(jī)理　出處：《巖土工程學(xué)報(bào)》2017年11期 　論文類型：期刊論文

【摘要】：通過(guò)模擬硫酸型酸雨加速侵蝕石灰?guī)r的室內(nèi)試驗(yàn),監(jiān)測(cè)了試驗(yàn)過(guò)程中試樣的質(zhì)量變化、Ca~(2+)釋放量、酸雨pH值變化、計(jì)算了H~+消耗速率及試樣的表面硬度變化率,對(duì)試樣的微觀結(jié)構(gòu)進(jìn)行了觀察和測(cè)量,對(duì)比分析了酸雨的淋蝕作用和浸泡作用,根據(jù)試驗(yàn)結(jié)果討論了酸雨溶蝕石灰?guī)r的機(jī)理,并分析了孔隙特征對(duì)石灰?guī)r溶蝕過(guò)程的影響。試驗(yàn)結(jié)果表明:酸雨的淋蝕作用會(huì)溶解石灰?guī)r中的碳酸鹽并剝離巖石表面,造成新鮮巖石繼續(xù)與酸雨作用,加速了石灰?guī)r的質(zhì)量損失和Ca~(2+)的釋放,同時(shí)試樣的表面硬度和表層微觀結(jié)構(gòu)發(fā)生相應(yīng)的改變,但是,溶蝕產(chǎn)物會(huì)部分填充石灰?guī)r內(nèi)的微孔隙和微裂隙,可以有效減緩小尺寸孔隙(0.01μm)的破壞;孔隙特征對(duì)酸雨侵蝕石灰?guī)r的過(guò)程有重要影響,孔隙率越高,酸雨越容易進(jìn)入巖石內(nèi)部并造成破壞;孔隙率一定的情況下,孔隙尺寸越大,酸雨作用的時(shí)間和程度會(huì)越充分,對(duì)石灰?guī)r的破壞也越嚴(yán)重;在相同的試驗(yàn)條件下,試驗(yàn)選取的3種石灰?guī)r中南響堂山石窟石灰?guī)r的抗酸雨侵蝕能力最弱。
[Abstract]:By simulating the accelerated erosion of limestone by sulphuric acid rain, the mass change of the sample and the pH value of the acid rain are monitored. The rate of H ~ ~ consumption and the change rate of the surface hardness of the sample are calculated. The microstructure of the sample was observed and measured, and the leaching and soaking of acid rain were compared and analyzed. Based on the experimental results, the mechanism of acid rain dissolution of limestone was discussed. The effect of pore characteristics on the dissolution process of limestone is analyzed. The experimental results show that the leaching of acid rain can dissolve the carbonate in limestone and peel off the rock surface, causing the fresh rock to continue to interact with acid rain. The mass loss of limestone and the release of Ca~(2) were accelerated, and the surface hardness and microstructure of the sample changed accordingly. However, the dissolution products partially filled the micro-pores and fractures in the limestone. The pore characteristics have an important effect on the process of acid rain eroding limestone. The higher the porosity, the easier it is to enter the rock and cause damage. The larger the porosity is, the larger the pore size is. The more sufficient the time and degree of acid rain, the more serious the damage to limestone, and under the same test conditions, the ability of acid rain resistance of the limestone in the south Xiangtangshan Grottoes is the weakest under the same test conditions.
【作者單位】： 中國(guó)科學(xué)院地質(zhì)與地球物理研究所中國(guó)科學(xué)院頁(yè)巖氣與地質(zhì)工程重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);中國(guó)文化遺產(chǎn)研究院文物修復(fù)所;蘭州大學(xué)土木工程學(xué)院;
【基金】：財(cái)政部基本科研業(yè)務(wù)費(fèi)課題(2014-JBKY-06) 科技部支撐計(jì)劃課題(2014BAK16B02)
【分類號(hào)】：K85;TU45
，

本文編號(hào)：1499654