本文關(guān)鍵詞：非單一平面滑移破壞模式下?lián)跬翂Φ牡卣鸱蔷�性土壓力探討　出處：《湖南大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 擋土墻 土壓力 地震 非線性分布 地震系數(shù) 非單一平面

【摘要】：擋土墻是一種防止土體坍塌的土工構(gòu)筑物,被廣泛地應用于水利和水電工程、港口工程、建筑工程、公路工程和鐵路工程等工程領域。隨著我國經(jīng)濟實力的快速增長,全國各地基礎設施的建設腳步不斷向前,尤其是中西部許多地區(qū)的現(xiàn)有交通建設已不能滿足經(jīng)濟發(fā)展的需求,這一形勢也對基礎設施建設中大量使用的擋土墻工程提出了新的挑戰(zhàn)。在擋土墻的抗震設計中,地震土壓力的計算起到非常關(guān)鍵的作用。西方有學者早在17世紀就已經(jīng)著手研究土壓力,但是,關(guān)于擋土墻地震土壓力這方面的研究卻進展緩慢,研究成果也僅僅停留在理論階段,應用于工程實踐還存在諸多缺陷和不足。但在近幾十年,國內(nèi)外許多專家學者針對這一問題做了許多的理論和工程應用方面的研究工作,提出了很多理論和方法,為擋土墻的抗震設計和施工提供了有效的依據(jù)。然而,由于地震的破壞力巨大和諸多不確定因素,擋土墻的地震土壓力研究仍然是學術(shù)界與工程界共同關(guān)注的熱點問題�，F(xiàn)行的應用最為廣泛的地震土壓力理論是M-O方法,計算擋土墻地震土壓力時假設破壞面是一個平面,然而現(xiàn)實中的破壞面基本上為不規(guī)則曲面,兩者差別明顯;其它不足之處,如不能應用于粘性填土、不考慮填土對地震的放大效應、計算所得地震土壓力呈線性分布等。本文考慮到擋土墻施工質(zhì)量受限于天氣、地形和工期等的影響,墻背填土并非均勻。假定擋土墻墻背填土為2層性質(zhì)各異、干燥的無粘性土,地震條件下滑移破裂面為更接近實際情況的非單一平面;基于水平層分析法,建立地震條件下確定擋土墻土壓力分布的微分方程。通過求解模型,得到地震作用下?lián)跬翂ν翂毫Φ姆蔷�性分布解析解;分析了地震系數(shù)、填土內(nèi)摩擦角對地震土壓力分布、地震土壓力合力及其作用點的影響。結(jié)果表明,上層填土范圍內(nèi)擋土墻土壓力與單一平面滑移破壞基本一致,呈非線性變化;而下層填土范圍內(nèi)的擋土墻土壓力隨深度變化近似線性關(guān)系。從而知,上層填土范圍內(nèi)的擋土墻土壓力問題是分析的主要部分。通過本文研究,提高了復雜條件下計算擋土墻地震土壓力的精確性,對以后的設計,施工以及成本控制有一定的指導意義。
[Abstract]:A retaining wall is to prevent the collapse of soil structures, is widely used in water conservancy and Hydropower Engineering, port engineering, construction engineering, road engineering and railway engineering. With the rapid growth of China's economic strength, the construction steps of infrastructure across the country continue to move forward, especially the existing traffic construction many of the Midwest have been unable to meet the needs of economic development, the situation of the infrastructure construction in the large-scale use of retaining wall engineering has brought new challenges. In the seismic design of retaining wall, seismic earth pressure calculation plays a very important role. Some western scholars have started to study early in seventeenth Century earth pressure, however, research on seismic earth pressure of retaining walls in this area are slow, research only stays at the theoretical stage, applied to the engineering practice there are still many defects and deficiencies. But in recent years, many domestic and foreign experts and scholars on this issue to do research work in theory and engineering application in many aspects, put forward many theories and methods, and provides an effective reference for seismic design and construction of the retaining wall. However, due to the force of the earthquake and a great many uncertain factors, research seismic earth pressure of retaining wall is still a hot issue of common concern of academia and engineering. The current application of the seismic earth pressure theory widely used is the M-O method, calculation of seismic earth pressure on retaining wall when assuming the failure surface is a plane, but the failure surface in reality basically for irregular surface, the difference between the two obviously; other deficiencies, such as can not be applied to the soil, without considering the effect of amplification of seismic soil on the linear distribution of seismic earth pressure calculation considering the retaining wall. The construction quality is limited On the influence of terrain and weather, time limit, the wall backfill is not uniform. It is assumed that the retaining wall backfill into 2 layers of different nature, cohesionless soil drying conditions, seismic slip rupture surface is closer to the actual situation of the non single plane; horizontal layer analysis method based on the establishment of earthquake conditions determine the gear differential equation earth pressure distribution. By solving the model, nonlinear analysis of the distribution of earth pressure on retaining wall under earthquake solution; analysis of seismic coefficient, internal friction angle of seismic earth pressure distribution, influence of seismic earth pressure resultant and its point. The results show that the upper filling range of retaining wall and single plane slip failure is consistent, is nonlinear; while the lower filling range of earth pressure of retaining wall with depth approximate linear relationship. To know the upper soil retaining wall soil pressure is within the scope of the problem The main part of the analysis is to improve the accuracy of calculating the seismic earth pressure of retaining wall under complex conditions through this study, which is of guiding significance for future design, construction and cost control.

【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU476.4

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本文編號：1369179