本文選題：庫岸病害擋墻　切入點：沖擊荷載　出處：《重慶交通大學(xué)》2017年碩士論文

【摘要】：三峽成庫蓄水后,庫岸擋墻受水位變動影響,墻后土體強(qiáng)度降低,影響其穩(wěn)定性,出現(xiàn)了較多病害庫岸擋墻。板樁結(jié)構(gòu)是常見加固病害擋墻的結(jié)構(gòu)形式,但已有研究更多集中在板樁結(jié)構(gòu)加固病害擋墻的優(yōu)化方式以及加固之后病害擋墻抵抗變形的效果,較少考慮板樁結(jié)構(gòu)在加固施工過程中對原病害庫岸擋墻產(chǎn)生的影響。施工中產(chǎn)生的沖擊荷載給周圍建筑物帶來破壞的例子屢見不鮮,沖擊荷載對建筑物的穩(wěn)定性影響成為日益重視的問題。本文在前人研究的基礎(chǔ)上,借助PLAXIS有限元軟件分析了5種施工工況下?lián)鯄η胺經(jīng)_孔施工對擋墻的穩(wěn)定性影響,并對多樁同時施工條件下間距選擇對擋墻穩(wěn)定性影響進(jìn)行了分析。本文主要工作及取得的成果如下:(1)對被沖擊土體的本構(gòu)模型和沖擊荷載峰值計算公式進(jìn)行討論分析,確定本文采用的土體本構(gòu)模型和沖擊荷載計算方法。(2)在未破壞前,擋墻抵抗變形的能力隨著錘擊次數(shù)的增加而提高;隨著水位的升高,擋墻位移值有先增大后減小的趨勢。同時,沖擊力峰值和沖擊頻率的變化也會影響擋墻的位移值。(3)錘擊表面土層時對擋墻變形值影響最大,而后隨著錘擊深度的增加,這種變形影響程度出現(xiàn)大幅度的減小,施工中建議先小沖擊能沖孔施工,并重點監(jiān)測開始沖孔時擋墻的位移變化。隨著鋼護(hù)筒嵌入深度的增加,錘擊產(chǎn)生的沖擊荷載對擋墻影響越小,其中在鋼護(hù)筒嵌入風(fēng)化層時變位值有較大幅度的減小,建議施工中至少使鋼護(hù)筒嵌入風(fēng)化層以下,最好直接嵌入中風(fēng)化層后再沖孔施工。(4)多樁同步施工會較大的增加擋墻位移變形值,施工間距越大,對擋墻的穩(wěn)定性影響越小,當(dāng)施工間距增加到8D時(D為樁直徑),即跳3根樁施工,再加大施工間距減小擋墻位移值的效果較弱,故實際施工建議施工間距為8D。同時在施工中需要重點監(jiān)控由于多樁同步施工擋墻的變形量。
[Abstract]:After reservoir storage, the retaining wall of reservoir bank is affected by the change of water level, and the strength of soil behind the wall decreases, which affects the stability of the retaining wall, and many diseases occur. The sheet pile structure is the structural form of the commonly strengthened diseased retaining wall. However, more studies have been focused on the optimization of the reinforcement of the diseased retaining wall and the effect of resisting the deformation of the diseased retaining wall after the reinforcement. Less consideration is given to the influence of sheet pile structure on the original damaged bank retaining wall in the course of strengthening construction. Examples of damage to surrounding buildings caused by impact load in construction are not uncommon. The influence of impact load on the stability of buildings has been paid more and more attention. On the basis of previous studies, this paper analyzes the influence of punch construction on the stability of retaining wall under five construction conditions with the help of PLAXIS finite element software. The influence of spacing selection on the stability of retaining wall under the condition of multi-pile simultaneous construction is analyzed. The main work and results obtained in this paper are as follows: 1) the constitutive model of the affected soil and the formula for calculating the peak value of impact load are discussed and analyzed. It is determined that the soil constitutive model and impact load calculation method adopted in this paper increase the resistance of retaining wall to deformation with the increase of hammer impact times and increase with the increase of water level before failure. At the same time, the change of the peak impact force and the impact frequency will also affect the displacement value of the retaining wall. 3) when hammering the surface soil layer, the deformation value of the retaining wall will be most affected, and then with the increase of the depth of impact, the deformation value of the retaining wall will be greatly affected by the change of the peak impact force and the impact frequency. The influence of this deformation is greatly reduced. In construction, it is suggested that small impact energy should be used to punch holes first, and the displacement of retaining wall should be monitored at the beginning of punching. With the increase of the embedded depth of steel casings, The impact load caused by hammering has less influence on the retaining wall, in which the value of displacement is greatly reduced when the weathering layer is embedded in the steel shield. It is suggested that at least the steel retaining tube be embedded below the weathered layer in construction. It is better to embed the middle weathering layer directly before punching. 4) the simultaneous construction of multiple piles will increase the displacement and deformation value of the retaining wall. The larger the construction distance, the less the influence on the stability of the retaining wall. When the construction spacing is increased to 8D, the pile diameter is increased, that is, three piles are jumped, and the effect of increasing the construction spacing to reduce the displacement of the retaining wall is weak. Therefore, the actual construction distance is 8D. it is necessary to monitor the deformation of retaining wall due to multi-pile synchronous construction.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV697

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