本文關(guān)鍵詞：基于亞塑性理論的低液限粘土本構(gòu)模型與改善試驗(yàn)研究　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 低液限粘土 工程性質(zhì) 亞塑性理論 改善試驗(yàn)

【摘要】：隨著經(jīng)濟(jì)的飛速發(fā)展,城市的擴(kuò)張需要修建越來越多的高速公路。高速公路不可避免的會穿越許多地質(zhì)條件不明的區(qū)域。此類區(qū)域內(nèi)尚未存在有關(guān)于土體工程性質(zhì)等的研究。土體的工程性質(zhì)一直是本領(lǐng)域內(nèi)較難以研究的問題之一,如果只是經(jīng)過簡單的類比推理而沒有深入研究土體工程性質(zhì),則會在其應(yīng)用的過程中產(chǎn)生一系列的問題。本文依托濰北平原高速公路修建過程中遇到的特殊土質(zhì)及其在應(yīng)用過程中出現(xiàn)的一系列問題,開展了詳細(xì)而深入的研究。具體研究工作如下:(1)依托實(shí)體工程項目,實(shí)地調(diào)查了路線穿越場區(qū)自然地理環(huán)境和水文、工程地質(zhì)條件。根據(jù)該工程項目路基填料指定取土場的區(qū)域地質(zhì)條件,確定了現(xiàn)場土體的取樣方案。(2)針對從取土場獲取的土樣,開展了較全面的室內(nèi)試驗(yàn),首次深入全面地研究了該地區(qū)土體試樣的工程性質(zhì)并按照規(guī)范標(biāo)準(zhǔn)確定了其名稱為低液限粘土。在路基填筑施工期開展了現(xiàn)場試驗(yàn),埋設(shè)了電子監(jiān)測設(shè)備,研究了低液限粘土用作路基填料時的力學(xué)特性和變形規(guī)律。(3)研究了亞塑性理論的起源,重點(diǎn)分析了其限制條件。以Gudehus-Bauer亞塑性本構(gòu)模型為主線,首次引入受含水率影響的粘聚力變量并依據(jù)室內(nèi)土工試驗(yàn)和現(xiàn)場試驗(yàn)的試驗(yàn)成果,研究了適用于壓實(shí)狀態(tài)下低液限粘土的亞塑性本構(gòu)模型。(4)參照現(xiàn)場使用的路床區(qū)改善低液限粘土方案,并結(jié)合室內(nèi)試驗(yàn)得出的低液限粘土工程性質(zhì),分析了不同外加材料對低液限粘土的改善機(jī)理,制定了改善低液限粘土對比試驗(yàn)方案并進(jìn)行了室內(nèi)力學(xué)性能試驗(yàn),對比分析了不同方案的改良效果,提出了滿足規(guī)范要求的新型低液限粘土改良方案。(5)整理室內(nèi)改良試驗(yàn)得到的成果,在現(xiàn)場選取路基試驗(yàn)段進(jìn)行加固土的路用力學(xué)性能試驗(yàn),包括路面彎沉試驗(yàn)及堆載試驗(yàn)。選用原方案的路基試驗(yàn)段并按照新型改良方案鋪設(shè)路床區(qū)改善土層,按照規(guī)范標(biāo)準(zhǔn)進(jìn)行了彎沉試驗(yàn),試驗(yàn)結(jié)果表明改善土層的短時強(qiáng)度能滿足要求。選取現(xiàn)場原位試驗(yàn)中埋設(shè)電子監(jiān)測設(shè)備的路基區(qū)間為試驗(yàn)段,一部分鋪設(shè)改善土層而另一部分不進(jìn)行處理以進(jìn)行對比試驗(yàn),首次開展了現(xiàn)場路基堆載觀測試驗(yàn)以研究路床區(qū)改善土層的長期穩(wěn)定強(qiáng)度。首次結(jié)合前期高速公路路堤承載特性的模型試驗(yàn)的研究成果,對室內(nèi)試驗(yàn)得出的改善土現(xiàn)場試驗(yàn)方案進(jìn)行了整體評價。本文對于該區(qū)域土體工程性質(zhì)的研究,填補(bǔ)了該區(qū)域關(guān)于低液限粘土工程性質(zhì)資料的空白,能夠?yàn)閷硌芯吭搮^(qū)域地質(zhì)條件的研究人員提供一定的參考和借鑒,具有一定的理論意義;本文對于低液限粘土開展的改善試驗(yàn)研究,研究成果能為將來在該區(qū)域需要進(jìn)行低液限粘土改善處理的工程項目指明了方向,具有一定的經(jīng)濟(jì)價值和社會價值。
[Abstract]:With the rapid development of economy. The expansion of cities requires the construction of more and more highways. Expressways inevitably cross many areas with unknown geological conditions. There has not been any research on the engineering properties of soil in such areas. The nature of the process has always been one of the more difficult problems in this field. If only through simple analogy reasoning without in-depth study of soil engineering properties. In the process of its application a series of problems will arise. This paper relies on the Weibei Plain Expressway construction process encountered in the special soil quality and in the application of a series of problems. A detailed and in-depth study has been carried out. The specific research work is as follows: 1) relying on the physical engineering project, the physical geographical environment and hydrology of the route crossing the field area have been investigated on the spot. Engineering geological conditions. According to the regional geological conditions of the subgrade filling site designated by the project, the sampling plan of the field soil mass is determined, which is aimed at the soil samples obtained from the collection site. A more comprehensive indoor test was carried out, and the engineering properties of the soil samples in this area were studied thoroughly for the first time. According to the standard of the code, the name of the soil sample was determined as low liquid limit clay, and the field test was carried out during the construction period of the subgrade. The mechanical properties and deformation law of low liquid limit clay used as subgrade filler were studied. (3) the origin of subplastic theory was studied. The limitation conditions are analyzed. The main line is the Gudehus-Bauer hypoplastic constitutive model. The cohesion variable affected by moisture content was introduced for the first time, and the results of indoor geotechnical test and field test were used for the first time. The hypoplastic constitutive model for low liquid limit clay under compaction is studied. According to the road bed area used in the field, the scheme of improving low liquid limit clay is studied, and the engineering properties of low liquid limit clay obtained by laboratory test are also studied. The improvement mechanism of low liquid limit clay with different applied materials was analyzed, the contrast test scheme of improving low liquid limit clay was established, and the indoor mechanical property test was carried out, and the improvement effect of different schemes was compared and analyzed. The paper puts forward a new low liquid limit clay improvement scheme, which meets the requirements of the code, and arranges the results obtained from the indoor improvement test, and selects the roadbed test section on the spot to carry out the road mechanics performance test of the strengthened soil. Including pavement deflection test and surcharge test. The original roadbed test section was selected and the soil layer was improved according to the new improved road bed area. The deflection test was carried out according to the standard of the code. The test results show that the short-term strength of soil layer can meet the requirements. The section of roadbed embedded with electronic monitoring equipment in in-situ test is selected as the test section. One part was laid to improve the soil layer, while the other part was not treated for comparative testing. It is the first time to study the long-term stability strength of soil layer in roadbed area by field observation test of embankment load, and combine the research results of model test of embankment bearing characteristics in the early stage of expressway for the first time. In this paper, the research on the engineering properties of soil in this area fills up the blank of the engineering properties of low liquid limit clay in this area. It can provide a certain reference and reference for the researchers who study the geological conditions of the region in the future, which has certain theoretical significance. In this paper, the experimental research on the improvement of low liquid limit clay has been carried out. The results of the research can point out the direction of the engineering projects which need to improve the low liquid limit clay in this area in the future, and have certain economic and social value.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U416

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本文編號：1408593