發(fā)布時(shí)間：2018-04-11 16:03

  本文選題：軟土路基 + 加固技術(shù)��； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：由于我國西部地區(qū)山河縱橫、地形地質(zhì)條件十分復(fù)雜,交通基礎(chǔ)設(shè)施建設(shè)中將不可避免的面臨軟弱地基處理問題,軟基加固已成為交通建設(shè)領(lǐng)域亟需解決的難點(diǎn)問題,也是道路工程建設(shè)中的技術(shù)關(guān)鍵。 本文結(jié)合現(xiàn)階段西部地區(qū)在建公路項(xiàng)目,對(duì)軟基穩(wěn)定性影響因素、各類軟土路基處理方法進(jìn)行分析、比較及分析,探討了如何依據(jù)工程地質(zhì)條件、道路條件、施工條件以及建設(shè)費(fèi)用合理的選擇軟基處治方案,主要結(jié)論如下： (1)山地型軟土散布于我國廣大山地區(qū)域,其沉積環(huán)境與工程特性與沿海型軟土及內(nèi)陸淤積型軟土均有較大不同,一般沉積于嶺腳山澗等低洼地帶,經(jīng)歷長期的干濕循環(huán)、生化變異及沉積作用而形成。 (2)路堤高度及軟土厚度對(duì)軟土路基邊坡穩(wěn)定性影響顯著。隨著路堤高度的增搞,路基安全系數(shù)隨之逐漸減小,路基邊坡危險(xiǎn)滑面位置及滑弧半徑也在不斷發(fā)展。隨著軟弱土層厚度的逐漸增厚,路基邊坡安全系數(shù)呈現(xiàn)出逐步減小的趨勢(shì),路基邊坡危險(xiǎn)滑面逐漸向路堤內(nèi)部發(fā)展。 (3)通過對(duì)粉噴樁法加固軟基數(shù)值模擬,可以看出伴隨著打樁及路堤填筑施工作業(yè)的進(jìn)行,不同的施工步下路基實(shí)時(shí)沉降增量各不相同。粉噴樁法有效地制約了軟弱地層受荷壓縮變形的趨勢(shì),提高了軟土路基的承載能力。 (4)粉噴樁及強(qiáng)夯法加固處治技術(shù)對(duì)該地區(qū)軟土地基的處理均可以達(dá)到設(shè)計(jì)要求,但粉噴樁加固處理的資源投入較大,而強(qiáng)夯法法加固處理時(shí)要求地基含水量必須較低。強(qiáng)夯法存在較大噪音污染,并且對(duì)周邊已有建筑物、構(gòu)造物會(huì)的穩(wěn)定有用的影響。粉噴樁雖然無污染且工期較短,但要求投入較大,成本較高。
[Abstract]:Because of the mountains and rivers in the west of China, the terrain and geological conditions are very complex, the traffic infrastructure construction will inevitably face the problem of soft foundation treatment, soft foundation reinforcement has become a difficult problem to be solved in the field of traffic construction.Also is the technical key in the road engineering construction.This paper analyzes, compares and analyzes the influencing factors of soft foundation stability and the treatment methods of various soft soil subgrade, and discusses how to base on the engineering geological conditions and road conditions, in connection with the highway projects under construction in the western region at present.The main conclusions are as follows: (1) the construction conditions and the construction cost should be reasonable to select the soft foundation treatment scheme, and the main conclusions are as follows:The sedimentary environment and engineering characteristics of the mountainous soft soil are different from those of the coastal soft soil and the inland silt soft soil. Generally, they are deposited in the low-lying areas such as the mountain stream at the foot of the mountain, and have experienced a long period of dry and wet cycles.Biochemical variation and deposition.The height of embankment and the thickness of soft soil have significant influence on the slope stability of soft subgrade.With the increase of embankment height, the subgrade safety coefficient decreases gradually, and the dangerous slide surface position and slide arc radius of roadbed slope are also developing.With the increasing of the thickness of soft soil, the safety factor of roadbed slope decreases gradually, and the dangerous slip surface of roadbed slope gradually develops to the interior of embankment.3) through numerical simulation of soft foundation strengthened by powder jet pile method, it can be seen that with the construction of piling and embankment filling, the real time settlement increment of subgrade is different with different construction steps.Powder injection pile method effectively restricts the tendency of compression and deformation of soft ground and improves the bearing capacity of soft soil subgrade.4) the treatment of soft soil foundation by powder jet pile and dynamic compaction method can meet the design requirements, but the resource input for the treatment of powder jet pile is large, and the water content of the foundation must be lower when the method of dynamic compaction is used to reinforce the foundation.The dynamic compaction method has a large noise pollution, and has a useful influence on the stability of the surrounding buildings and structures.Although powder jet pile has no pollution and short time limit, it needs more investment and higher cost.
【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)】：U416.1

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本文編號(hào)：1736692