發(fā)布時(shí)間：2018-06-26 19:09

  本文選題：單孔聲波法 + 地震CT層析成像��； 參考：《西南交通大學(xué)》2014年碩士論文

【摘要】：水電站大壩同其他建筑物一樣,都會(huì)從建成使用、漸趨老化最后直到消亡,為了延長(zhǎng)水電大壩使用壽命,對(duì)大壩消亡過(guò)程實(shí)行有效的控制,需對(duì)在建及已建成大壩進(jìn)行質(zhì)量檢測(cè)。經(jīng)濟(jì)且有效的利用地球物理探測(cè)方法對(duì)水電大壩壩基巖體進(jìn)行勘察及評(píng)價(jià),提出合適的探測(cè)方法,會(huì)產(chǎn)生良好的經(jīng)濟(jì)效益和社會(huì)效益。 錦屏一級(jí)水電大壩地質(zhì)條件復(fù)雜,斷層、層間擠壓錯(cuò)動(dòng)帶、節(jié)理裂隙、深部裂縫等發(fā)育嚴(yán)重,灌漿施工技術(shù)難度也大大增加,灌漿效果直接影響到大壩的后續(xù)運(yùn)行安全。本文以錦屏水電大壩建基面巖體質(zhì)量檢測(cè)為工程背景,對(duì)大壩基礎(chǔ)帷幕灌漿和固結(jié)灌漿等進(jìn)行綜合物探檢測(cè)。綜合單孔聲波、地震波CT層析成像、鉆孔電視和鉆孔變模等四種物探檢測(cè)方法,對(duì)水電大壩固結(jié)灌漿進(jìn)行質(zhì)量檢測(cè),并對(duì)各物探方法的適宜性及各方法之間的相關(guān)性進(jìn)行研究和優(yōu)選。 對(duì)綜合物探方法在壩基抗力體地質(zhì)缺陷評(píng)價(jià)中進(jìn)行了研究分析,單孔聲波法、地震波CT層析成像及鉆孔變模能反映巖體物性參數(shù),鉆孔電視能更好的反映巖體特征,均與現(xiàn)場(chǎng)的巖體質(zhì)量具有較好的對(duì)應(yīng)關(guān)系,地質(zhì)缺陷在各物探方法結(jié)果中均有較好的體現(xiàn)。 單孔聲波采用一發(fā)雙收的探測(cè)技術(shù),其檢測(cè)孔布置便利、檢測(cè)范圍廣,而且探測(cè)精度高,能對(duì)灌漿質(zhì)量進(jìn)行定量評(píng)價(jià),且探測(cè)得到聲波曲線對(duì)裂隙發(fā)育地段反映強(qiáng)烈,但不能反映與鉆孔平行方向構(gòu)造,而且單孔聲波不能探測(cè)一定區(qū)域范圍的灌漿質(zhì)量；地震波CT層析成像技術(shù)方法可反映兩孔之間的軟弱巖帶和較差巖體情況,但處理數(shù)據(jù)量很大；鉆孔電視全景成像可直觀觀測(cè)巖體質(zhì)量等級(jí)劃分和裂隙發(fā)育情況,但不能對(duì)灌漿質(zhì)量進(jìn)行定量評(píng)價(jià)；鉆孔變模直接反應(yīng)巖體的抗變形能力,但探測(cè)過(guò)程要求很高。針對(duì)各物探方法優(yōu)缺點(diǎn),對(duì)錦屏一級(jí)水電大壩進(jìn)行質(zhì)量檢測(cè),采用以單孔聲波為主,地震波CT層析成像、鉆孔電視和鉆孔變模為輔助的檢測(cè)手段。
[Abstract]:Hydropower dams, like other buildings, are built and used, aging and finally dying out. In order to extend the service life of hydropower dams, the process of dam extinction is effectively controlled. It is necessary to check the quality of the dam under construction and already completed. It is economical and effective to use geophysical detection method to investigate and evaluate the foundation rock mass of hydropower dam, and to put forward a suitable detection method, which will produce good economic and social benefits. The geological conditions of Jinping first class hydropower dam are complex, fault, interlayer compression dislocation zone, joint fissure, deep crack, and so on, and the difficulty of grouting construction technology is greatly increased. The grouting effect directly affects the safety of the dam's subsequent operation. In this paper, based on the engineering background of quality detection of foundation rock mass of Jinping Hydropower Dam, comprehensive geophysical exploration is carried out for curtain grouting and consolidation grouting of dam foundation. Combining four geophysical detection methods, such as single hole acoustic wave, seismic wave CT tomography, borehole television and borehole changing mode, the quality of consolidation grouting of hydropower dam is tested. The suitability of each geophysical prospecting method and the correlation between each method are studied and optimized. The comprehensive geophysical exploration method is studied and analyzed in the evaluation of the geological defects of the dam foundation resistance body. The single hole acoustic wave method, seismic wave CT tomography and borehole changing model can reflect the physical parameters of the rock mass, and the borehole television can better reflect the rock mass characteristics. The geological defects are well reflected in the results of various geophysical prospecting methods. The single hole acoustic wave adopts the detection technology of one generation and two collection. The detection hole arrangement is convenient, the detection range is wide, the detection precision is high, the grouting quality can be quantitatively evaluated, and the acoustic wave curve can reflect the crack development area strongly. But it can not reflect the parallel direction structure with the borehole, and the single hole acoustic wave can not detect the grouting quality in a certain area, and the seismic wave CT tomography technique can reflect the weak rock zone and the poor rock mass between the two holes. But the processing data is very large, the borehole television panoramic imaging can directly observe the rock mass quality classification and the crack development, but can not carry on the quantitative evaluation to the grouting quality, the borehole changes the mold directly to reflect the rock mass to resist the deformation ability, But the detection process is very demanding. Aiming at the merits and demerits of each geophysical exploration method, the quality test of Jinping grade I hydropower dam is carried out by means of single hole acoustic wave, seismic wave CT tomography, borehole television and borehole changing mode.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV221.2;P631

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本文編號(hào)：2071102