微型樁受力機理及應(yīng)用分析
發(fā)布時間：2018-07-13 18:45
【摘要】：我國滑坡地質(zhì)災(zāi)害頻發(fā)，在滑坡治理時抗滑樁是常見的工程措施。一般，它是通過增大樁身橫截面來增加樁的剛度和強度，從而抵抗滑坡推力。大截面抗滑樁在實際施工中存在很多問題，，如：滑坡施工場地坡度較大不便于大型施工機械設(shè)備進場，只好更多地采用人工挖孔的方式施工；工程土方量大，施工干擾大，對臨滑狀態(tài)的滑坡?lián)岆U有很大影響；施工效率低、成本高、安全性差等等。 微型樁作為一種新型的抗滑支擋結(jié)構(gòu)物，在治理滑坡中的優(yōu)良抗滑效果已經(jīng)得到了國外研究學者的一致認可，并大規(guī)模的投入到實際工程應(yīng)用中，但是國內(nèi)對于微型樁的研究特別是微型樁受力機理的研究還遠遠不足。本文通過理論計算和有限元數(shù)值模擬兩種方法結(jié)合的手段對微型樁受力機理進行分析，在與他人物理模型試驗結(jié)果對比的基礎(chǔ)上得到了以下結(jié)論： ①根據(jù)微型樁應(yīng)用的歷史資料、工程實例分析，微型樁與大型抗滑樁相比較具有自重小、施工空間要求小，易于機械化施工，對地基承載力要求低，工期短等特點，適于路基災(zāi)害搶險和滑坡工程的應(yīng)急搶險工程。 ②布設(shè)微型樁時，樁體錨固段的合理長度由微型樁截面、錨固段巖體粘結(jié)系數(shù)、滑體或變形體的粘結(jié)系數(shù)、經(jīng)驗共同決定，推薦值為3-5m。 ③通過數(shù)值模擬分析、理論計算與他人的物理模型試驗成果比較，得出微型樁設(shè)置為3排較為合理，前排裝承受更大的推力，后排依次遞減12%，因此應(yīng)考慮通過增加微型樁內(nèi)鋼筋來加強或者加密前排樁。 ④單樁微型樁受土抗力的極值出現(xiàn)土體高度距離地面2/3處。 ⑤運用PLAXIS有限元軟件對文天路滑坡治理全過程進行模擬，從全程來看，微型樁作為應(yīng)急搶險措施是有效的，但是若將其作為永久治理工程，其適用性有待考證；搶險中的微型樁的變形和失穩(wěn)表現(xiàn)為彎剪變形。永久工程實施后，它的作用主要是輔助錨桿和抗滑樁保持滑坡的穩(wěn)定。
[Abstract]:Landslide geological hazards occur frequently in China, and anti-slide pile is a common engineering measure in landslide control. In general, it increases the stiffness and strength of the pile by increasing the cross-section of the pile body to resist the landslide thrust. There are many problems in the actual construction of large section anti-slide pile, such as: the large slope of landslide construction site is not convenient for large construction machinery and equipment to enter the field, so it has to be constructed more by manual digging, and the engineering earthwork is large and the construction interference is great. It has a great influence on landslide emergency, low construction efficiency, high cost, poor safety and so on. As a new type of anti-slide retaining structure, the fine anti-slide effect of micro-pile in landslide control has been unanimously recognized by foreign researchers, and has been put into practical application on a large scale. However, the study of micro pile, especially the mechanism of micro pile, is far from enough. In this paper, the mechanical mechanism of micro-pile is analyzed by means of theoretical calculation and finite element numerical simulation. On the basis of comparison with other physical model test results, the following conclusions are obtained: (1) according to the historical data of the application of micro-pile and the analysis of engineering examples, the self-weight of micro-pile is smaller than that of large-scale anti-slide pile. The construction space is small, the construction space is easy to mechanize construction, the requirement to the foundation bearing capacity is low, the time limit is short, and so on, so it is suitable for the emergency rescue engineering of subgrade disaster and landslide engineering. The reasonable length of the anchoring section of the pile body is determined by the micro pile section, the rock mass bond coefficient of the anchoring section, the bond coefficient of sliding body or deformable body, and the experience. The recommended value is 3-5 m. 3 through numerical simulation analysis. Compared with others' physical model test results, the theoretical calculation shows that it is more reasonable to set the micro-pile to three rows, and the front row bears more thrust. The back row decreases 12% in turn, so we should consider strengthening or infilling the front row pile by adding reinforcing bar in the micro pile. 4 the extreme value of the soil resistance of single pile micro pile is 2 / 3 from the ground surface. 5. PLAXIS finite element software is used to simulate the whole process of controlling Wentianlu landslide. From the whole process, the miniature pile is effective as an emergency rescue measure, but if it is regarded as a permanent treatment project, its applicability needs to be verified, and the deformation and instability of the micro-pile are shown as bending and shear deformation. After the implementation of the permanent project, its main role is to assist the anchor and anti-slide pile to maintain the stability of the landslide.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U418.55;U416.1
本文編號：2120396
[Abstract]:Landslide geological hazards occur frequently in China, and anti-slide pile is a common engineering measure in landslide control. In general, it increases the stiffness and strength of the pile by increasing the cross-section of the pile body to resist the landslide thrust. There are many problems in the actual construction of large section anti-slide pile, such as: the large slope of landslide construction site is not convenient for large construction machinery and equipment to enter the field, so it has to be constructed more by manual digging, and the engineering earthwork is large and the construction interference is great. It has a great influence on landslide emergency, low construction efficiency, high cost, poor safety and so on. As a new type of anti-slide retaining structure, the fine anti-slide effect of micro-pile in landslide control has been unanimously recognized by foreign researchers, and has been put into practical application on a large scale. However, the study of micro pile, especially the mechanism of micro pile, is far from enough. In this paper, the mechanical mechanism of micro-pile is analyzed by means of theoretical calculation and finite element numerical simulation. On the basis of comparison with other physical model test results, the following conclusions are obtained: (1) according to the historical data of the application of micro-pile and the analysis of engineering examples, the self-weight of micro-pile is smaller than that of large-scale anti-slide pile. The construction space is small, the construction space is easy to mechanize construction, the requirement to the foundation bearing capacity is low, the time limit is short, and so on, so it is suitable for the emergency rescue engineering of subgrade disaster and landslide engineering. The reasonable length of the anchoring section of the pile body is determined by the micro pile section, the rock mass bond coefficient of the anchoring section, the bond coefficient of sliding body or deformable body, and the experience. The recommended value is 3-5 m. 3 through numerical simulation analysis. Compared with others' physical model test results, the theoretical calculation shows that it is more reasonable to set the micro-pile to three rows, and the front row bears more thrust. The back row decreases 12% in turn, so we should consider strengthening or infilling the front row pile by adding reinforcing bar in the micro pile. 4 the extreme value of the soil resistance of single pile micro pile is 2 / 3 from the ground surface. 5. PLAXIS finite element software is used to simulate the whole process of controlling Wentianlu landslide. From the whole process, the miniature pile is effective as an emergency rescue measure, but if it is regarded as a permanent treatment project, its applicability needs to be verified, and the deformation and instability of the micro-pile are shown as bending and shear deformation. After the implementation of the permanent project, its main role is to assist the anchor and anti-slide pile to maintain the stability of the landslide.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U418.55;U416.1
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