降雨條件下微型樁—土共同作用機理研究
發(fā)布時間：2018-07-20 13:07
【摘要】：邊坡穩(wěn)定性是巖土工程和土木工程領(lǐng)域的一個重要研究課題。微型樁邊坡支護是一種新的邊坡支護方式。與傳統(tǒng)的抗滑維穩(wěn)支撐結(jié)構(gòu)相比,微型樁具有施工快捷方便,體積小,施工快速,適用范圍廣等優(yōu)點。微型樁作為控制滑坡穩(wěn)定性的新技術(shù),其在工程中的實際應(yīng)用相對較晚,且對項目的實際使用多為經(jīng)驗法,相關(guān)設(shè)計理論等也還不完善。關(guān)于微型樁加固的目前研究正處于初步階段,特別是對于雨后的微型樁邊坡修復(fù)工程,這對微型樁未來的發(fā)展和應(yīng)用是非常不利的。基于室內(nèi)模型試驗,研究了降雨條件下微型樁支護邊坡作用下微型樁內(nèi)部應(yīng)力分布,樁側(cè)土壓力分布和樁頂位移情況。試驗結(jié)果表明:試驗前,采用分層填筑的方法由坡底向坡頂制作邊坡,由于制作順序是從下而上進行,因此存在下層坡體被過多擊實的問題。從而導(dǎo)致邊坡上層土體相較于下層而言較松,加載后變形大。微型樁的受力特點大致相同,但同一根樁上、中、下部位受力特點有明顯差別。表現(xiàn)為中部應(yīng)變最大,下部應(yīng)變其次,上部應(yīng)變最小,且樁體上部應(yīng)變值為負(fù),由此可以推斷樁體由下到上彎矩方向相反,中部是反彎點;基于ABAQUS有限元軟件針對室內(nèi)模型試驗建立降雨入滲條件下微型樁支護邊坡的有限元模型,并對其雨后邊坡穩(wěn)定性進行了相應(yīng)的分析,分析了降雨持續(xù)時間和樁間距對邊坡穩(wěn)定性的影響。并得出了一系列結(jié)論:隨著降水量的增加,邊坡土體的飽和度增加;由于微型樁的阻塞作用,微型樁位置處土體左右飽和度始終呈現(xiàn)出階梯型變化,與無樁邊坡區(qū)別明顯;邊坡的應(yīng)力也隨著降雨而變化,并且樁側(cè)位置出現(xiàn)應(yīng)力集中現(xiàn)象,表明隨著潛在滑動面的發(fā)展,微型樁在逐漸發(fā)揮阻礙作用。比較模型試驗和有限元模擬表明,微型樁結(jié)構(gòu)對于滑坡的加固效果明顯,與傳統(tǒng)的抗滑樁結(jié)構(gòu)相比,微型樁屬于柔性支護,其雖然不能像傳統(tǒng)的支護樁一樣單獨發(fā)揮加固作用,但其可通過微型樁群樁之間相互作用而改善其自身剛度不足等缺陷,因此,微型樁多被認(rèn)為是一種支護系統(tǒng),通過樁與樁之前的相互作用而產(chǎn)生支護的效果,其為進一步研究微型樁提供了理論基礎(chǔ)。
[Abstract]:Slope stability is an important research topic in geotechnical and civil engineering fields. Micro pile slope support is a new way of slope support. Compared with the traditional anti-slide support structure, micro-pile has the advantages of quick and convenient construction, small volume, fast construction and wide range of application. As a new technique to control landslide stability, micro-pile is relatively late in practical application in engineering, and the practical use of the project is mostly empirical method, and the related design theory is not perfect. The research on micro-pile reinforcement is at the initial stage, especially for the slope restoration of micro-pile after rain, which is very disadvantageous to the development and application of micro-pile in the future. Based on indoor model tests, the internal stress distribution, soil pressure distribution and pile top displacement of micro-pile supporting slope under rainfall were studied. The test results show that before the test, the method of stratified filling is used to make slope from the bottom to the top of the slope. Because the production sequence is from the bottom to the top, there is the problem of the lower slope body being overcompacted. As a result, the upper soil mass of the slope is looser than that of the lower layer, and the deformation is large after loading. The stress characteristics of micro pile are roughly the same, but there are obvious differences between the upper, middle and lower parts of the same pile. The maximum strain is in the middle, the strain in the lower part is the second, the strain in the upper part is the smallest, and the strain value of the upper part of the pile is negative. It can be concluded that the direction of the pile bending moment is opposite from the bottom to the top, and the middle part is the reverse bending point. Based on Abaqus finite element software, the finite element model of micro-pile supporting slope under rainfall infiltration condition is established for indoor model test, and the stability of slope after rain is analyzed accordingly. The influence of rainfall duration and pile spacing on slope stability is analyzed. A series of conclusions are drawn as follows: with the increase of precipitation, the saturation of slope soil increases, because of the blocking effect of micro-pile, the saturation of left and right soil in the position of micro-pile always presents ladder type change, which is obviously different from that of non-pile-free slope. The stress of the slope also changes with rainfall and the stress concentration on the side of the pile shows that with the development of the potential sliding surface the micro-pile is gradually playing a role of hindrance. Compared with the traditional anti-slide pile structure, the micro-pile belongs to flexible support, although it can not play a strengthening role alone as the traditional supporting pile, compared with the traditional anti-slide pile structure, the micro-pile structure has obvious effect to the landslide reinforcement, compared with the traditional anti-slide pile structure, the micro-pile structure belongs to flexible support. However, it can improve the deficiency of its own stiffness by interaction between pile groups. Therefore, micro-pile is considered to be a kind of supporting system, and the effect of supporting is produced by interaction between pile and pile before. It provides a theoretical basis for the further study of micro pile.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1
本文編號：2133618
[Abstract]:Slope stability is an important research topic in geotechnical and civil engineering fields. Micro pile slope support is a new way of slope support. Compared with the traditional anti-slide support structure, micro-pile has the advantages of quick and convenient construction, small volume, fast construction and wide range of application. As a new technique to control landslide stability, micro-pile is relatively late in practical application in engineering, and the practical use of the project is mostly empirical method, and the related design theory is not perfect. The research on micro-pile reinforcement is at the initial stage, especially for the slope restoration of micro-pile after rain, which is very disadvantageous to the development and application of micro-pile in the future. Based on indoor model tests, the internal stress distribution, soil pressure distribution and pile top displacement of micro-pile supporting slope under rainfall were studied. The test results show that before the test, the method of stratified filling is used to make slope from the bottom to the top of the slope. Because the production sequence is from the bottom to the top, there is the problem of the lower slope body being overcompacted. As a result, the upper soil mass of the slope is looser than that of the lower layer, and the deformation is large after loading. The stress characteristics of micro pile are roughly the same, but there are obvious differences between the upper, middle and lower parts of the same pile. The maximum strain is in the middle, the strain in the lower part is the second, the strain in the upper part is the smallest, and the strain value of the upper part of the pile is negative. It can be concluded that the direction of the pile bending moment is opposite from the bottom to the top, and the middle part is the reverse bending point. Based on Abaqus finite element software, the finite element model of micro-pile supporting slope under rainfall infiltration condition is established for indoor model test, and the stability of slope after rain is analyzed accordingly. The influence of rainfall duration and pile spacing on slope stability is analyzed. A series of conclusions are drawn as follows: with the increase of precipitation, the saturation of slope soil increases, because of the blocking effect of micro-pile, the saturation of left and right soil in the position of micro-pile always presents ladder type change, which is obviously different from that of non-pile-free slope. The stress of the slope also changes with rainfall and the stress concentration on the side of the pile shows that with the development of the potential sliding surface the micro-pile is gradually playing a role of hindrance. Compared with the traditional anti-slide pile structure, the micro-pile belongs to flexible support, although it can not play a strengthening role alone as the traditional supporting pile, compared with the traditional anti-slide pile structure, the micro-pile structure has obvious effect to the landslide reinforcement, compared with the traditional anti-slide pile structure, the micro-pile structure belongs to flexible support. However, it can improve the deficiency of its own stiffness by interaction between pile groups. Therefore, micro-pile is considered to be a kind of supporting system, and the effect of supporting is produced by interaction between pile and pile before. It provides a theoretical basis for the further study of micro pile.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1
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