【摘要】：隨著軟土地區(qū)城市建設(shè)的不斷發(fā)展,城市用地情況越來(lái)越緊張,如何提高土地的利用率成為了如今城市建設(shè)發(fā)展的主題。隨著土地以上空間的不斷開(kāi)發(fā)使用,樓層高度逐漸攀升,但是樓層高度也不是無(wú)限的,這就要求我們想辦法充分利用地面以下的空間,如此便誕生了地下空間開(kāi)發(fā)時(shí)產(chǎn)生的土體支護(hù)問(wèn)題。如何合理安全的選擇支護(hù)結(jié)構(gòu)開(kāi)發(fā)地下空間需要強(qiáng)有力的科學(xué)技術(shù)支持,特別是在深厚淤泥層中基坑支護(hù)結(jié)構(gòu)選型不當(dāng)容易引起基坑位移過(guò)大、坍塌、場(chǎng)地周邊管線和道路損壞等對(duì)環(huán)境造成較大影響的問(wèn)題。這就需要深入研究軟土的各種性狀及其在不同開(kāi)挖條件下對(duì)支護(hù)結(jié)構(gòu)的影響,從而提出在深厚軟土地區(qū)開(kāi)挖深大基坑的最優(yōu)支護(hù)方式。在深厚軟土地區(qū)深基坑支護(hù)工程的大量實(shí)踐中,發(fā)現(xiàn)軟土地區(qū)深基坑支護(hù)工程中的實(shí)際土壓力與理論土壓力值差別較大,且不同深度上的土壓力值呈非線性變化。如何最大限度的降低因基坑土方開(kāi)挖造成的主動(dòng)土壓力劇烈變化是基坑支護(hù)過(guò)程中的關(guān)鍵問(wèn)題,而分級(jí)支護(hù)是分散土壓力、提高支護(hù)結(jié)構(gòu)剛度利用率的有效方法。因此,在軟土地區(qū)深基坑支護(hù)過(guò)程中應(yīng)充分考慮分級(jí)綜合支護(hù),降低單一支護(hù)結(jié)構(gòu)最大支護(hù)高度,充分發(fā)揮各種支護(hù)結(jié)構(gòu)的優(yōu)勢(shì),但是如何科學(xué)合理地在不同地層環(huán)境條件下組合使用各類支護(hù)結(jié)構(gòu)即成為了當(dāng)前急需解決的重要課題。本文利用實(shí)際工程案例系統(tǒng)分析研究了深厚軟土地層深基坑分級(jí)組合支護(hù)中土壓力與支護(hù)結(jié)構(gòu)的相互協(xié)調(diào)關(guān)系。具體研究成果主要包括:1.分級(jí)組合支護(hù)結(jié)構(gòu)體系在不同地層環(huán)境條件下的適用條件;2.軟土地區(qū)深基坑分級(jí)組合支護(hù)中土壓力的計(jì)算及其實(shí)際分布;3.小尺寸筒體支護(hù)結(jié)構(gòu)在分級(jí)支護(hù)結(jié)構(gòu)中的特殊運(yùn)用。
[Abstract]:With the continuous development of urban construction in soft soil areas, the situation of urban land use is becoming more and more tense. How to improve the utilization rate of land has become the theme of urban construction and development. With the continuous development and use of the space above the land, the floor height gradually rises, but the floor height is not unlimited, which requires us to find ways to make full use of the space below the ground level. In this way, the soil support problem occurred when the underground space was developed. How to select the support structure reasonably and safely to develop the underground space needs strong scientific and technological support, especially in the deep silt layer, the improper selection of the foundation pit support structure may cause the foundation pit displacement to be too large and collapse. The damage of pipelines and roads around the site has a great impact on the environment. Therefore, it is necessary to deeply study the characteristics of soft soil and its influence on the supporting structure under different excavation conditions, so as to put forward the optimal support method for excavation of deep and large foundation pit in deep soft soil area. In the practice of deep foundation pit support engineering in deep soft soil area, it is found that the actual earth pressure in the deep foundation pit support engineering in soft soil area is quite different from the theoretical earth pressure value, and the earth pressure value in different depth shows nonlinear variation. How to minimize the active earth pressure caused by excavation is the key problem in the process of foundation pit support, while the graded support is an effective method to disperse the earth pressure and improve the stiffness utilization ratio of the supporting structure. Therefore, in the process of supporting deep foundation pit in soft soil area, we should take full account of hierarchical comprehensive support, reduce the maximum support height of single support structure, and give full play to the advantages of various supporting structures. However, how to use all kinds of supporting structures scientifically and reasonably under different stratum environment conditions has become an important issue that needs to be solved. In this paper, the relationship between earth pressure and supporting structure in deep foundation pit combined support in deep soft soil is analyzed and studied systematically by using practical engineering cases. Specific research results include: 1. The suitable conditions of hierarchical combined support structure system under different stratigraphic environment conditions; 2. Calculation and actual distribution of earth pressure in deep foundation pit combined support in soft soil area; 3. Special Application of small size cylinder support structure in hierarchical support structure.
【學(xué)位授予單位】：石家莊經(jīng)濟(jì)學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU753

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相關(guān)期刊論文 前1條

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本文編號(hào)：2426615