本文選題：強(qiáng)夯法 + 加筋土擋墻�。� 參考：《浙江大學(xué)》2013年碩士論文

【摘要】：近年來,隨著工程建設(shè)規(guī)模的不斷擴(kuò)大,越來越多的工程(如電廠、變電站、石化和機(jī)場等工程)選址在山地或丘陵地帶,以保護(hù)環(huán)境和節(jié)約用地。這些工程的地基大部分為高填方地基,將要面臨著大量的土方回填工作。由于強(qiáng)夯法具有經(jīng)濟(jì)高效、施工簡單、地基處理效果明顯等優(yōu)點,因而常被用來處理高填方地基,從而提高地基土的強(qiáng)度和承載力,降低地基土的壓縮性,改善回填地基的不均勻性。高邊坡或加筋土擋墻往往會伴隨高填方地基的產(chǎn)生而產(chǎn)生,因而研究加筋土擋墻的工作性能及強(qiáng)夯振動對加筋土擋墻的影響具有重大的現(xiàn)實意義和工程價值。 本文以某特高壓變電站新建工程高填方地基為依托,對強(qiáng)夯加固高填方地基中的一些具體問題進(jìn)行了分析,研究了強(qiáng)夯振動的衰減規(guī)律及強(qiáng)夯振動對加筋土擋墻的影響,提出了防治強(qiáng)夯振動的具體措施,主要內(nèi)容有： 1.介紹了常用的高填方地基處理方法,提出了強(qiáng)夯法的優(yōu)越性。闡述了強(qiáng)夯(置換)加固地基原理和加筋土擋墻原理。 2.分別開展強(qiáng)夯置換試驗和回填土強(qiáng)夯試驗,根據(jù)地基加固結(jié)果對強(qiáng)夯(置換)施工參數(shù)和施工工藝進(jìn)行優(yōu)化選擇。 3.分析了山區(qū)高填方強(qiáng)夯地基常用的幾種檢測手段的基本原理和優(yōu)缺點,在此基礎(chǔ)上,探討了綜合采用多種檢測手段在大面積山區(qū)回填碎石土強(qiáng)夯地基中檢測的可能性,并根據(jù)大量的檢測試驗結(jié)果,運(yùn)用統(tǒng)計學(xué)原理分析了地基承載力特征值、變形模量、剪切波速和動力觸探擊數(shù)之間的相關(guān)性。 4.根據(jù)現(xiàn)場強(qiáng)夯振動試驗和有限元模擬結(jié)果,分析了強(qiáng)夯振動的衰減規(guī)律及其強(qiáng)夯對加筋土擋墻位移場的影響,提出了強(qiáng)夯施工的安全距離和防治強(qiáng)夯振動的措施。 5.根據(jù)現(xiàn)場加筋土擋墻土工格柵內(nèi)力監(jiān)測和有限元分析結(jié)果,分析了土工格柵內(nèi)力的變化規(guī)律,提出了加筋土擋墻潛在破壞面的發(fā)展趨勢。
[Abstract]:In recent years, with the continuous expansion of engineering construction, more and more projects (such as power plants, substations, petrochemical and airport projects) are located in mountainous or hilly areas to protect the environment and save land. The foundation of these projects is mostly high-fill foundation, and will face a lot of earthwork backfill. Because the dynamic compaction method has the advantages of economy and efficiency, simple construction and obvious effect of foundation treatment, it is often used to treat high fill foundation, thus increasing the strength and bearing capacity of foundation soil and reducing the compressibility of foundation soil. Improve the inhomogeneity of backfill foundation. High slope or reinforced earth retaining wall often comes into being with high fill foundation, so it is of great practical significance and engineering value to study the working performance of reinforced earth retaining wall and the influence of dynamic compaction vibration on reinforced earth retaining wall. Based on the high fill foundation of a new project of an UHV substation, this paper analyzes some concrete problems in the reinforcement of high fill foundation by dynamic compaction, and studies the attenuation law of dynamic compaction vibration and the influence of dynamic compaction vibration on reinforced earth retaining wall. The concrete measures to prevent vibration of dynamic compaction are put forward. The main contents are as follows: 1. This paper introduces the common treatment methods of high fill foundation, and puts forward the superiority of dynamic compaction method. This paper expounds the principle of dynamic compaction (replacement) strengthening foundation and reinforced earth retaining wall. 2. Dynamic tamping replacement test and backfill dynamic compaction test were carried out respectively. According to the results of foundation reinforcement, the construction parameters and construction technology of dynamic compaction (replacement) were optimized. 3. This paper analyzes on the basic principle, advantages and disadvantages of several testing methods commonly used in high fill dynamic compaction foundation in mountainous area. On the basis of this, the possibility of detecting the dynamic compaction foundation of backfilled gravel soil in a large area of mountainous area by comprehensive use of many kinds of testing methods is discussed. Based on a large number of test results, the correlation between the characteristic values of bearing capacity, modulus of deformation, shear wave velocity and the number of dynamic penetration is analyzed by using the statistical principle. 4. Based on field dynamic compaction vibration test and finite element simulation results, the attenuation law of dynamic compaction vibration and the influence of dynamic compaction on displacement field of reinforced earth retaining wall are analyzed. The safe distance of dynamic compaction construction and measures to prevent and cure dynamic compaction vibration are put forward. 5. Based on the results of field monitoring and finite element analysis of geogrid internal force of reinforced earth retaining wall, the variation law of geogrid internal force is analyzed, and the development trend of potential failure surface of reinforced earth retaining wall is put forward.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU472.31

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本文編號：2027517