本文選題：強(qiáng)夯 + 不同含水率��； 參考：《中北大學(xué)》2017年碩士論文

【摘要】：強(qiáng)夯法作為一種地基處理的方法,因其適用范圍廣、施工機(jī)械簡單、加固效果顯著、造價(jià)相對較低等優(yōu)點(diǎn),已經(jīng)被廣泛應(yīng)用于各種地基處理的工程當(dāng)中。目前,針對于不同土質(zhì)條件下強(qiáng)夯加固效果以及加固機(jī)理已經(jīng)進(jìn)行了深入的研究,通過與施工結(jié)合也積累了大量的實(shí)際經(jīng)驗(yàn),取得了顯著的成效。然而,針對于同一種土體,不同含水率情況下的強(qiáng)夯加固效果卻少有研究。基于此,本文取用五種不同含水率的土體,通過開展1:8室內(nèi)模型試驗(yàn),研究同一能級不同錘重-落距組合下的強(qiáng)夯加固效果,并且與室內(nèi)擊實(shí)試驗(yàn)進(jìn)行對比,最終得到以下結(jié)論:1、強(qiáng)夯法與擊實(shí)試驗(yàn)均存在最優(yōu)含水率,且強(qiáng)夯法的最優(yōu)含水率略小于擊實(shí)試驗(yàn)。2、無論是在哪種含水率的情況下,輕錘高落距的累計(jì)夯沉量均小于重錘低落距,且輕錘高落距組合對于土體含水率的敏感性高于重錘低落距。因此,在土體含水率差異較大的地區(qū),采用重錘低落距的施工工藝加固效果更好、更均勻。3、當(dāng)土體含水率較低的時(shí)候,強(qiáng)夯的加固范圍主要集中在土體淺層一定深度范圍。土體含水率接近強(qiáng)夯最優(yōu)含水率的時(shí)候,相對壓密程度隨著深度均勻地減小。當(dāng)土體含水率較高時(shí),在土體淺層范圍內(nèi)出現(xiàn)了明顯的壓縮不均勻現(xiàn)象。4、得到了在模型試驗(yàn)中的能級下有效加固深度與含水率之間的關(guān)系:=Y(36.14-20.3+0.91-ɑ)2??,其中ɑ為組合影響系數(shù)。5、通過對夯錘能量反彈比曲線的分析得到:夯錘能量反彈比隨著夯擊次數(shù)的增加逐漸收斂,以此可以作為停夯的一個(gè)新參考標(biāo)準(zhǔn)。
[Abstract]:As a kind of foundation treatment method, dynamic compaction method has been widely used in various foundation treatment projects because of its wide application scope, simple construction machinery, remarkable reinforcement effect, relatively low cost and so on. At present, the reinforcement effect and mechanism of dynamic compaction under different soil conditions have been deeply studied, and a great deal of practical experience has been accumulated by combining with construction, and remarkable results have been achieved. However, for the same soil, there is little research on the effect of dynamic compaction under different moisture content. Based on this, five kinds of soil with different moisture content are used in this paper. Through the 1:8 indoor model test, the reinforcement effect of dynamic compaction under the same energy level and different hammer-drop distance combination is studied, and the results are compared with the indoor compaction test. Finally, we get the following conclusion: 1, there is an optimal moisture content in both the dynamic compaction method and the compaction test, and the optimal moisture content of the dynamic compaction method is slightly smaller than that of the compaction test. The accumulative tamping amount of light hammer drop distance is smaller than that of weight hammer drop distance, and the sensitivity of light hammer height drop distance combination to soil moisture content is higher than that of weight hammer drop distance. Therefore, in the area where the moisture content of soil is different, the reinforcement effect is better and more uniform. When the moisture content of soil is low, the reinforcement range of dynamic compaction is mainly in the depth range of shallow soil layer. When the soil moisture content is close to the optimal moisture content of dynamic compaction, the relative compaction degree decreases uniformly with the depth. When the soil moisture content is high, In the shallow layer of soil, there is obvious compression inhomogeneous phenomenon. 4. The relationship between effective reinforcement depth and moisture content under the energy level in model test is obtained. The relationship between effective reinforcement depth and moisture content is obtained. The relation between the effective reinforcement depth and the moisture content is obtained. The coefficient of composite influence is 0. 5, and the energy of ramming hammer is obtained by means of ramming hammer energy. The analysis of rebound ratio curve shows that the energy rebound ratio of rammer converges with the increase of tamping times. This can be used as a new reference standard for stopping tamping.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU472.31

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