本文選題：拓寬路基　切入點(diǎn)：強(qiáng)度折減法　出處：《重慶交通大學(xué)》2014年碩士論文

【摘要】：本文針對(duì)目前拓寬路基過程中需要不封路的施工要求,基于常用的路基邊坡穩(wěn)定性分析中的強(qiáng)度折減法,對(duì)此種特殊工程狀況的邊坡進(jìn)行了有限元分析。 為了準(zhǔn)確掌握實(shí)際工程中的斷面幾何形態(tài)以及土質(zhì)力學(xué)強(qiáng)度因素對(duì)不封路狀態(tài)拓寬路基邊坡施工穩(wěn)定性的影響,通過現(xiàn)場調(diào)研選擇有代表性的土樣進(jìn)行室內(nèi)試驗(yàn),測試土樣的物理力學(xué)特性,并且以試驗(yàn)結(jié)果為建�；A(chǔ),研究建立了ABAQUS的強(qiáng)度折減法邊坡穩(wěn)定模型,同時(shí)在此基礎(chǔ)上對(duì)斷面幾何參數(shù)、材料力學(xué)指標(biāo)和模型計(jì)算參數(shù)進(jìn)行影響分析；根據(jù)模型計(jì)算結(jié)果,提出了兩種邊坡穩(wěn)定防護(hù)方法,從理論上上對(duì)整個(gè)施工過程做出了詳細(xì)的數(shù)值分析。 結(jié)果表明： (1)利用強(qiáng)度折減法建立的邊坡穩(wěn)定分析模型可以很好的表達(dá)這種特殊的施工模式,分析過程中以斜坡內(nèi)某點(diǎn)的位移與折減系數(shù)的關(guān)系曲線的突變點(diǎn)作為判別準(zhǔn)則； (2)對(duì)于本模型中,路基的填土高度不宜過高,且邊坡坡率以1：1.5以上為宜；且開挖過程中臺(tái)階數(shù)量增多,安全系數(shù)逐漸增大,多級(jí)開挖可以保證施工更加安全；路基土的C,φ以及剪脹角會(huì)顯著影響邊坡安全穩(wěn)定系數(shù),而土基的C、剪脹角基本不會(huì)影響,φ會(huì)影響安全系數(shù),但是影響程度小于路基土。無論是路基土還是土基,回彈模量對(duì)邊坡穩(wěn)定性的影響都極�。粔郝窓C(jī)荷載是一個(gè)重要的影響因素,且當(dāng)荷載達(dá)到最大的4500KN時(shí),安全穩(wěn)定系數(shù)急劇下降,邊坡失穩(wěn)破壞。 (3)土工格柵和換填處治土均是兩種經(jīng)濟(jì)、實(shí)用的邊坡防護(hù)方法。設(shè)置了土工格柵后,安全系數(shù)提高兩倍,說明土工格柵能給予較大的承力支持；而換填處治土后安全穩(wěn)定系數(shù)增長了38.2%,說明換填法對(duì)于邊坡穩(wěn)定性的提高有十分重要的作用。
[Abstract]:In view of the construction requirement of not sealing the road in the process of widening the roadbed at present, based on the strength reduction method commonly used in the stability analysis of subgrade slope, the finite element analysis of the slope with this special engineering condition is carried out in this paper.In order to accurately understand the influence of section geometry and soil mechanical strength factors on the stability of roadbed slope construction without road closure, the representative soil samples are selected for indoor test through field investigation.On the basis of testing the physical and mechanical properties of the soil samples, and based on the experimental results, the stability model of ABAQUS's strength reduction slope is established, and the geometric parameters of the section are also analyzed.According to the results of model calculation, two methods of slope stability protection are put forward, and the detailed numerical analysis of the whole construction process is made theoretically.The results show that:1) the slope stability analysis model established by the strength reduction method can well express this special construction mode. In the process of analysis, the catastrophe point of the curve between the displacement and the reduction coefficient of a certain point in the slope is taken as the criterion;2) for this model, the filling height of roadbed should not be too high, and the slope ratio of side slope should be above 1: 1.5, and the number of steps increases and the safety factor increases gradually during the excavation process, and the multi-stage excavation can ensure the construction to be safer.The C, 蠁 and the angle of shear expansion of subgrade soil will significantly affect the coefficient of slope safety stability, but the C and the angle of expansion of soil foundation will not affect the safety factor, 蠁 will affect the safety factor, but the influence degree is smaller than that of subgrade soil.Whether subgrade soil or soil foundation, the modulus of resilience has very little influence on slope stability, and the load of roller is an important factor, and when the load reaches the maximum 4500KN, the coefficient of safety stability decreases sharply and the slope loses stability.Geogrid and soil replacement are two economic and practical slope protection methods.After the geogrid is set up, the safety factor is increased by two times, which indicates that the geogrid can give greater support to the force, while the coefficient of safety and stability increases by 38.2% after the replacement of the soil, which indicates that the replacement method plays a very important role in the improvement of slope stability.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.14

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 方建瑞;朱合華;蔡永昌;;邊坡穩(wěn)定性研究方法與進(jìn)展[J];地下空間與工程學(xué)報(bào);2007年02期

2 李連崇;唐春安;邢軍;唐烈先;;節(jié)理巖質(zhì)邊坡變形破壞的RFPA模擬分析[J];東北大學(xué)學(xué)報(bào);2006年05期

3 王萬忠,焦菊英;黃土高原侵蝕產(chǎn)沙強(qiáng)度的時(shí)空變化特征[J];地理學(xué)報(bào);2002年02期

4 欒茂田,武亞軍,年廷凱;強(qiáng)度折減有限元法中邊坡失穩(wěn)的塑性區(qū)判據(jù)及其應(yīng)用[J];防災(zāi)減災(zāi)工程學(xué)報(bào);2003年03期

5 李廣森,裴國輝,李莉;河灘料在路基填筑工程中的應(yīng)用[J];中國港灣建設(shè);2001年05期

6 張世綏;高等級(jí)公路邊坡的生物防護(hù)技術(shù)[J];公路;2002年09期

7 張偉雄,曹志強(qiáng),黃小清;高速公路邊坡生態(tài)防護(hù)技術(shù)探討[J];公路;2003年08期

8 周琳;高速公路邊坡生態(tài)防護(hù)技術(shù)研究[J];公路;2005年09期

9 張玉浩,張立宏;邊坡穩(wěn)定性分析方法及其研究進(jìn)展[J];廣西水利水電;2005年02期

10 唐天國;曾祥芳;周昌華;;對(duì)公路邊坡生態(tài)防護(hù)原理與應(yīng)用技術(shù)的初步研究[J];交通標(biāo)準(zhǔn)化;2006年08期

，

本文編號(hào)：1722634