本文選題：紅砂巖 + 工程特性�。� 參考：《合肥工業(yè)大學》2014年碩士論文

【摘要】：紅砂巖作為一種不良的填筑材料，是工程建設(shè)中經(jīng)常遇到的一類特殊巖土體，若能充分有效地應(yīng)用于工程建設(shè)中，將具有重要的經(jīng)濟、環(huán)境及社會效益。依托績黃高速路基01標項目，以皖南山區(qū)的紅砂巖作為研究對象，從資料調(diào)研、分析測試、室內(nèi)試驗和工程應(yīng)用四個方面對紅砂巖的工程特性進行了深入系統(tǒng)的研究。 采用巖礦鑒定、X射線衍射和X射線熒光光譜等分析測試方法分析了紅砂巖的礦物成分組成及微觀結(jié)構(gòu)特征；通過室內(nèi)膨脹性試驗和崩解性試驗探討了紅砂巖的膨脹機理及崩解機理；開展一系列室內(nèi)路用性能的土工試驗，初步論證了紅砂巖直接作為路基填料的可行性；結(jié)合試驗結(jié)果及工程實際應(yīng)用效果，提出了針對崩解性紅砂巖填料路基的設(shè)計方法和施工質(zhì)量控制措施。結(jié)果表明： （1）紅砂巖巖性多樣，結(jié)構(gòu)復(fù)雜，多屬于粘土類，主要包含蒙脫石、伊利石、高嶺石、綠泥石等粘土礦物和SiO2、A12O3、Fe2O3、CaO、K2O、MgO、TiO2、Na2O等化學成分，總體強度偏低，易崩解，抗風化能力偏弱； （2）紅砂巖的膨脹性是顆粒的機械膨脹和顆粒晶體體積吸水增大的綜合體現(xiàn)，其崩解過程是一個在水介質(zhì)參與下，由粘土礦物失水、吸水以及膠結(jié)物溶解引起的微觀結(jié)構(gòu)變化向宏觀整體碎裂破壞變化的發(fā)展過程； （3）合理控制含水率、壓實度等關(guān)鍵指標，，紅砂巖的各項路用性能指標均能滿足高等級公路的使用要求，可以直接用作路基填料； （4）水是觸發(fā)紅砂巖路基病害的主要外因，要從疏、堵兩方面解決好排水、隔水問題，通過適當?shù)臋C械配置和工藝組合進行破碎、擠密、振壓和沖擊補強，形成密實不透水的紅砂巖壓實體，保證紅砂巖填料處于相對封閉狀態(tài)，抑制殘余水活性的發(fā)揮，可確保紅砂巖路基填料的長期穩(wěn)定性。 相關(guān)研究結(jié)果可為紅砂巖地區(qū)工程建設(shè)提供參考，為相關(guān)設(shè)計規(guī)范和施工規(guī)范的制定、修訂和完善提供依據(jù)。
[Abstract]:Red sandstone, as a bad filling material, is a kind of special rock and soil, which is often encountered in engineering construction. If it can be fully and effectively applied in engineering construction, it will have important economic, environmental and social benefits. Based on the project No. 01 of Ji-Huang high-speed roadbed and taking the red sandstone in southern Anhui mountainous area as the research object, the engineering characteristics of the red sandstone were studied systematically from four aspects: data investigation, analysis and test, laboratory test and engineering application. The mineral composition and microstructure of red sandstone were analyzed by X-ray diffraction and X-ray fluorescence spectrometry. The expansion mechanism and disintegration mechanism of red sandstone are discussed through indoor expansibility test and disintegration test, and a series of geotechnical tests on indoor road performance are carried out, and the feasibility of using red sandstone as subgrade filler is preliminarily proved. Combined with the test results and the practical application effect, the design method and construction quality control measures of the subgrade with crushed red sandstone fillers are put forward. The results show that: (1) the red sandstone has a variety of lithology and complex structure, most of which belong to clay, mainly including clay minerals such as montmorillonite, Illite, kaolinite, chlorite and so on, and the chemical compositions such as SiO2A12O3Fe2O3Fe2O3CaOK2O-MgOTiO2O2Na2O, etc., the overall strength is on the low side, easy to disintegrate, and the ability to resist weathering is weak; (2) the expansibility of red sandstone is a comprehensive manifestation of the mechanical expansion of particles and the increase of water absorption of grain crystals. The disintegration process is a loss of water from clay minerals with the participation of water medium. The development process of the microstructure change from water absorption and the dissolution of the cement to the macroscopic fragmentation and destruction; 3) the key indexes, such as water content and compaction degree, can be controlled reasonably and each road performance index of red sandstone can meet the requirements of high grade highway, and can be used as subgrade filler directly. Water is the main external cause of the red sandstone roadbed disease. It is necessary to solve the problem of drainage and water insulation from the aspects of drainage and blockage, and to crush, squeeze, vibrate and strengthen the roadbed by proper mechanical configuration and process combination. In order to ensure the long-term stability of the red sandstone subgrade filler, the compaction entity of dense and impermeable red sandstone can be formed to ensure the red sandstone packing is in a relatively closed state, and the activity of residual water is restrained, and the long-term stability of the red sandstone subgrade filler is ensured. The relevant research results can provide reference for engineering construction in red sandstone area, and provide basis for the formulation, revision and improvement of relevant design and construction codes.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.1;U414

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