發(fā)布時(shí)間：2018-06-05 05:24

  本文選題：邊坡 + 樁基　； 參考：《重慶大學(xué)》2016年碩士論文

【摘要】：在重慶等山地城市,常需要在靠近邊坡頂?shù)奈恢眯藿ńㄖ?建筑樁基和邊坡的相互作用不容忽視。本文運(yùn)用有限元軟件ansys對(duì)邊坡-樁基-框架整體模型進(jìn)行靜力和動(dòng)力分析。本文的主要研究?jī)?nèi)容有:研究靜力和動(dòng)力作用下土質(zhì)邊坡和巖質(zhì)邊坡內(nèi)的建筑樁基對(duì)邊坡支擋結(jié)構(gòu)設(shè)計(jì)側(cè)向巖土壓力的影響,和邊坡變形對(duì)樁基內(nèi)力的影響以及樁土隔開措施在靜力和動(dòng)力作用下的效果。通過(guò)本文的研究得出以下結(jié)論:(1)靜力作用下,土質(zhì)邊坡和巖質(zhì)邊坡處于非極限狀態(tài)時(shí),建筑樁基的存在造成邊坡的側(cè)向巖土壓力出現(xiàn)增大的現(xiàn)象。(2)靜力作用下當(dāng)邊坡處于極限狀態(tài)時(shí),如果樁基的底部在擋土墻底部以下,樁基把建筑荷載傳到了下面穩(wěn)定的土層,可以不考慮建筑樁基對(duì)擋土墻的影響。在邊坡滑動(dòng)面以內(nèi)的樁基受到邊坡推力的作用,內(nèi)力分布情況和抗滑樁相似。(3)靜力作用下,有外傾結(jié)構(gòu)面的巖質(zhì)邊坡處于極限狀態(tài)時(shí),建筑樁基起到了抗滑樁的有利作用,設(shè)計(jì)支擋結(jié)構(gòu)時(shí),可以不考慮建筑樁基的影響。但是樁的內(nèi)力在穿越滑動(dòng)面處發(fā)生突變,彎矩和剪力都很大,需要加強(qiáng)樁基的配筋。無(wú)外傾結(jié)構(gòu)面的巖質(zhì)邊坡錨桿支擋設(shè)計(jì)時(shí)需要考慮建筑樁基的影響,支擋結(jié)構(gòu)如果選擇擋土墻,設(shè)計(jì)時(shí)不需要考慮建筑樁基的影響。(4)動(dòng)力作用下土質(zhì)邊坡內(nèi)有建筑樁基時(shí),建筑樁基會(huì)傳附加動(dòng)土壓力到擋土墻。附加動(dòng)土壓力呈倒三角形。動(dòng)力作用下有外傾結(jié)構(gòu)面巖質(zhì)邊坡內(nèi)的建筑樁基起到了抗滑樁的有利作用,所以邊坡錨桿的內(nèi)力比無(wú)結(jié)構(gòu)模型小。無(wú)外傾結(jié)構(gòu)面的巖質(zhì)邊坡由于比較穩(wěn)定,邊坡變形小,建筑樁基和邊坡的相互作用不明顯。(5)由于樁基起到抗滑樁的有利作用,而且樁基通過(guò)豎向摩擦力傳到滑體上的力并不大,所以油氈隔開的效果并不理想,套筒隔開措施有減小樁基內(nèi)力的作用。
[Abstract]:In mountainous cities such as Chongqing, it is often necessary to build buildings near the top of the slope, and the interaction between the pile foundation and the slope can not be ignored. In this paper, the static and dynamic analysis of the slope-pile foundation-frame model is carried out by using the finite element software ansys. The main contents of this paper are as follows: the influence of the pile foundation in the soil slope and the rock slope on the lateral geotechnical pressure in the design of the slope retaining structure under the static and dynamic action is studied. And the influence of slope deformation on the internal force of pile foundation and the effect of pile-soil separation measures under static and dynamic action. Through the research in this paper, the following conclusion is drawn: under the static force, the soil slope and the rock slope are in the non-limit state. When the slope is in the limit state, if the bottom of the pile foundation is below the bottom of the retaining wall, the pile foundation transmits the building load to the underlying stable soil layer. The influence of pile foundation on retaining wall can be ignored. Under the action of slope thrust, the distribution of internal force is similar to that of anti-slide pile, when the rock slope with extroverted structure surface is in the limit state, the building pile foundation plays the beneficial role of anti-slide pile. When designing retaining structure, the influence of building pile foundation can be ignored. However, the internal force of the pile changes suddenly through the sliding surface, and the bending moment and shear force are very large, so it is necessary to strengthen the reinforcement of the pile foundation. The influence of building pile foundation should be taken into account in the design of anchor rod support of rock slope without extroverted structural plane. If retaining wall is selected, the influence of pile foundation should not be taken into account in the design of retaining structure, when there is building pile foundation in soil slope under dynamic action, Building piles transmit additional dynamic earth pressure to the retaining wall. The additional dynamic earth pressure is inverted triangle. Under the dynamic action, the pile foundation in the rock slope with extroverted structure has the advantage of anti-slide pile, so the internal force of the anchor rod of the slope is smaller than that of the unstructured model. Because the rock slope with no extroverted structure plane is relatively stable, the slope deformation is small, the interaction between the building pile foundation and the slope is not obvious. (5) because the pile foundation plays the beneficial role of anti-slide pile, and the pile foundation does not reach the sliding body through the vertical friction force, Therefore, the effect of linoleum separation is not ideal, sleeve separation measures can reduce the internal force of pile foundation.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU473.1;TU435

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本文編號(hào)：1980752