本文關(guān)鍵詞： 強(qiáng)風(fēng)化泥巖 濕干交替 岸坡應(yīng)力 崩解特性　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：水庫運(yùn)行期岸坡消落帶內(nèi)泥巖在周期性“濕干”交替作用下易發(fā)生崩解,給泥巖岸坡的穩(wěn)定性帶來不利的影響,甚至引起岸坡的失穩(wěn)。為了研究消落帶強(qiáng)風(fēng)化泥巖的崩解特性,課題組研發(fā)了一套可以模擬水庫運(yùn)行期岸坡消落帶巖石所處的岸坡應(yīng)力和周期性“濕干”交替共同作用環(huán)境的軟巖崩解試驗(yàn)裝置(SGRYBJY-2016),通過開展泥巖在“濕干”交替與岸坡應(yīng)力共同作用下的崩解試驗(yàn)、物質(zhì)組分變化測試、宏細(xì)觀結(jié)構(gòu)測試等,獲得巴東組強(qiáng)風(fēng)化紫紅色泥巖的崩解規(guī)律,揭示水庫運(yùn)行期消落帶強(qiáng)風(fēng)化泥巖崩解機(jī)理。具體的研究內(nèi)容和研究成果概述如下:首先,選取巴東組強(qiáng)風(fēng)化紫紅色泥巖為代表,對水庫運(yùn)行期岸坡消落帶“濕干”交替作用環(huán)境特征與岸坡應(yīng)力作用環(huán)境特征進(jìn)行分析,通過水庫運(yùn)行期岸坡消落帶環(huán)境模擬試驗(yàn),獲得當(dāng)不考慮岸坡應(yīng)力(即岸坡表面三向應(yīng)力為0MPa)時(shí),“濕干”交替作用下泥巖濕化時(shí)間和干燥時(shí)間分別為4天和1天,獲得考慮岸坡應(yīng)力(即岸坡表面處于兩向應(yīng)力狀態(tài))時(shí),“濕干”交替作用下泥巖濕化時(shí)間和干燥時(shí)間分別為3天和1天;然后,進(jìn)行泥巖在“濕干”交替作用與岸坡應(yīng)力共同作用下的崩解試驗(yàn),崩解試驗(yàn)的每個(gè)周期結(jié)束后,對母巖及崩解物進(jìn)行顆分試驗(yàn),從母巖上取部分碎片進(jìn)行X射線衍射(XRD)、能量色散譜(EDS)、掃描電鏡(SEM)和吸水性測試,取泥巖試樣“濕化”過程的浸泡液進(jìn)行化學(xué)成分測試,獲得泥巖物質(zhì)組分、粒徑分布和宏細(xì)觀結(jié)構(gòu)隨水庫運(yùn)行期“濕干”交替作用次數(shù)的變化規(guī)律;接著,根據(jù)吸水率和顆分試驗(yàn)結(jié)果,建立泥巖吸水率和崩解系數(shù)隨水庫運(yùn)行期“濕干”交替作用次數(shù)變化的數(shù)理模型。模型表明,當(dāng)岸坡表面三向應(yīng)力均為0MPa時(shí),泥巖吸水率隨“濕干”交替作用次數(shù)的變化符合對數(shù)函數(shù),崩解系數(shù)符合指數(shù)函數(shù)變化;當(dāng)岸坡表面兩向應(yīng)力分別為0.5MPa和1.0MPa時(shí),泥巖吸水率和崩解系數(shù)變化規(guī)律均符合指數(shù)函數(shù);最后,綜合分析泥巖在“濕干”交替作用與岸坡應(yīng)力共同作用下物質(zhì)組分、粒徑分布和宏細(xì)觀結(jié)構(gòu)隨“濕干”交替作用次數(shù)的變規(guī)律,揭示三峽庫區(qū)消落帶強(qiáng)風(fēng)化泥巖在水庫運(yùn)行期的崩解機(jī)制。
[Abstract]:In the reservoir running period, the mudstone is liable to collapse under the cyclic "wet dry" alternating action, which has a negative effect on the stability of mudstone bank slope. In order to study the disintegration characteristics of strongly weathered mudstone in the falling zone. A soft rock disintegration test device SGRYBJY-2016 has been developed, which can simulate the interaction environment of slope stress and periodic "wet dry" interaction between the rock in the slope collapse zone during reservoir operation period. . Through the disintegration test of mudstone under the action of "wet dry" alternately and slope stress, material component change test, macroscopical structure test and so on, the disintegration law of Badong formation strongly weathered purple mudstone is obtained. Reveal the collapse mechanism of strongly weathered mudstone in reservoir operation period. The specific research contents and research results are summarized as follows: firstly, the strongly weathered purple mudstone of Badong formation is selected as the representative. The environmental characteristics of "wet dry" alternating action and stress of bank slope in reservoir operation period are analyzed, and the environmental simulation test of bank slope drop zone during reservoir operation period is carried out. When the slope stress is not taken into account (that is, the triaxial stress of the slope surface is 0 MPa), the wetting time and drying time of the mudstone under the alternating action of "wet dry" are 4 days and 1 day, respectively. The wetting time and drying time of mudstone under the alternating action of "wet dry" are 3 days and 1 day, respectively, when the slope stress is considered (that is, the slope surface is in the state of bidirectional stress). Then, the disintegration test of mudstone under the action of "wet dry" alternating action and slope stress is carried out. After each cycle of disintegration test, the parent rock and disintegrating material are tested. Some fragments were taken from the parent rock for X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM) and water absorption test. The chemical composition of the soaking solution in the process of "humidification" of mudstone samples was tested, and the variation law of mudstone material composition, particle size distribution and macrostructure with the alternating action times of "wet drying" during reservoir operation was obtained. Then, according to the results of water absorption and particle test, a mathematical model of the variation of mudstone water absorption rate and disintegration coefficient with the "wet dry" alternating action times during the reservoir operation period is established. The model shows that. When the surface stress of the slope is 0 MPA, the variation of mudstone water absorption rate with the alternating action times of "wet dry" accords with the logarithmic function, and the disintegration coefficient is in accordance with the exponential function. When the two-direction stress on the slope surface is 0.5 MPA and 1.0 MPA, the variation of mudstone water absorption rate and disintegration coefficient all accord with the exponential function. Finally, the variation law of material composition, particle size distribution and macrostructure of mudstone under the interaction of "wet dry" interaction and slope stress is analyzed synthetically with the "wet dry" alternating action times. The collapse mechanism of strongly weathered mudstone in the three Gorges reservoir area is revealed.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV697.23

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