衡重式樁板擋墻變形性狀的研究
發(fā)布時間：2018-10-12 14:44
【摘要】：衡重式樁板擋墻是一種新型支擋結(jié)構(gòu),由樁、鎖口梁、柱板墻和衡重臺(卸荷板)等構(gòu)件組成。由于設置了與墻身剛性連接的卸荷板,其減小了卸荷板下部結(jié)構(gòu)作用土壓力,并為樁提供一個反彎矩(相對于土壓力作用引起的彎矩),使結(jié)構(gòu)的內(nèi)力分布均衡；同時使支擋結(jié)構(gòu)離開土體的位移趨勢得到一定的限制。該類擋墻由于卸荷板的卸荷作用、反彎矩作用及結(jié)構(gòu)-上的相互作用,結(jié)構(gòu)的受力-變形性狀較其他類型的樁板式擋墻更為復雜。在前期研究工作中,對結(jié)構(gòu)的受力特性已進行了較深入的研究,但該類擋墻的變形性狀尚不明確,變形計算方法和控制變形的設計方法還有待研究。研究衡重式樁板擋墻的變形性狀,提出變形控制設計方法,進一步完善設計理論,對于該類結(jié)構(gòu)的進一步推廣應用具有重要的理論和工程實際意義。 本文基于彈性地基梁法,按“兩段法”推導了衡重式樁板擋墻內(nèi)力、變形解析分析方法。該分析方法計算結(jié)果與彈性桿系有限元方法的計算結(jié)果進行比較,計算結(jié)果比較接近；與模型試驗、現(xiàn)場測試結(jié)果比對,本文分析方法計算結(jié)果與實測結(jié)果符合,驗證了該分析方法的可靠性和合理性。 用本文提出的解析分析方法,研究卸荷板的埋深和板寬對結(jié)構(gòu)變形的影響,分析卸荷板的合理埋深和板寬位置,分析結(jié)果得到了模型試驗、數(shù)值分析方法的驗證。此外,還分析了樁長、樁徑和土體參數(shù)對結(jié)構(gòu)變形的影響。 采用FLAC軟件,考慮土與結(jié)構(gòu)共同作用的條件下,模擬填方擋墻和挖方擋墻不同施工順序進行數(shù)值分析,與本文分析方法、桿系有限元方法的結(jié)果進行了對比。得出結(jié)論：在考慮土與結(jié)構(gòu)相互作用的條件下,數(shù)值分析計算的變形較小；挖方擋墻按增量法與總量法計算的結(jié)構(gòu)內(nèi)力和變形比較接近；填方擋墻按增量法和總量法計算的結(jié)構(gòu)內(nèi)力比較接近,增量法計算的結(jié)構(gòu)變形比總量法計算結(jié)果大,與實測結(jié)果更為接近。 考慮土與結(jié)構(gòu)共同作用,用有限差分法對衡重式樁板擋墻墻后地表沉降進行分析。墻后地表沉降與卸荷板的設置位置有關(guān),卸荷板設置在合理位置時,墻后地表沉降為向下的拋物線,地表沉降影響范圍約為1.6H,地表沉降的最大值在距離墻背0.5H的位置,地表最大沉降與墻頂位移相等。 選取填方擋墻和挖方擋墻各一工程實例,對衡重式樁板擋墻的土壓力、結(jié)構(gòu)內(nèi)力和變形進行了現(xiàn)場測試,實測結(jié)果驗證了卸荷板的卸荷作用,其余土壓力、內(nèi)力和變形的實測數(shù)據(jù)與數(shù)值分析和本文分析方法計算結(jié)果接近。 最后,總結(jié)了衡重式樁板擋墻的變形特性,提出了卸荷板建議取值范圍及控制結(jié)構(gòu)變形的建議措施。
[Abstract]:The counterweight pile plate retaining wall is a new type of retaining structure, which is composed of pile, lock beam, column plate wall and counterweight platform (unloading plate) and so on. The unloading plate with rigid connection with the wall body reduces the earth pressure acting on the lower structure of the unloading plate, and provides a reverse bending moment (relative to the moment caused by the earth pressure) for the pile, which makes the internal force distribution of the structure balanced. At the same time, the displacement trend of retaining structure leaving soil is limited. The load-deformation behavior of this kind of retaining wall is more complex than that of other kinds of pile-plate retaining wall because of the unloading action of unloading plate, the action of reverse bending moment and the interaction between structure and structure. In the previous research work, the mechanical characteristics of the structure have been deeply studied, but the deformation behavior of the retaining wall is not clear, and the deformation calculation method and the design method to control the deformation are still to be studied. This paper studies the deformation behavior of the counterweight pile plate retaining wall, puts forward the design method of deformation control, and further consummates the design theory, which has important theoretical and engineering practical significance for the further popularization and application of this kind of structure. Based on the elastic foundation beam method, the analytical analysis method of the internal force and deformation of the retaining wall of pile and plate is derived according to the "two-stage method". The calculated results of this method are compared with those of the finite element method of elastic bar system, and the calculated results are close to those of the finite element method, and compared with the results of model tests and field tests, the calculated results of this analysis method are in agreement with the measured results. The reliability and rationality of the method are verified. Using the analytical analysis method proposed in this paper, the influence of the buried depth and the width of the unloading plate on the deformation of the structure is studied. The reasonable buried depth and the position of the plate width of the unloading plate are analyzed. The results of the analysis are verified by the model test and the numerical analysis method. In addition, the effects of pile length, pile diameter and soil parameters on structural deformation are analyzed. By using FLAC software and considering the interaction of soil and structure, the numerical analysis of different construction sequence of fill retaining wall and excavated retaining wall is carried out, and the results are compared with the results of this analysis method and the finite element method of bar system. It is concluded that under the condition of considering the interaction between soil and structure, the deformation calculated by numerical analysis is relatively small, and the internal force and deformation of the excavated retaining wall calculated by incremental method and aggregate method are close to each other. The structural internal forces calculated by the incremental method and the aggregate method are close to each other, and the structural deformation calculated by the incremental method is larger than that by the aggregate method, which is closer to the measured results. Considering the interaction between soil and structure, the surface settlement behind the retaining wall of pile plate is analyzed by finite difference method. The surface settlement behind the wall is related to the location of the unloading plate. When the unloading plate is set in a reasonable position, the surface settlement behind the wall is a downward parabola, the influence range of the surface settlement is about 1.6 H, and the maximum value of the surface settlement is 0.5 H from the back of the wall. The maximum settlement of the surface is equal to the displacement of the top of the wall. The earth pressure, structural internal force and deformation of the retaining wall with counterweight pile and plate are tested on the spot by selecting one engineering example of filling retaining wall and excavating retaining wall. The measured results verify the unloading effect of unloading plate and the remaining earth pressure. The measured data of internal force and deformation are close to the results of numerical analysis and the analytical method in this paper. Finally, the deformation characteristics of the counterweight pile plate retaining wall are summarized, and the suggested range of the unloading plate and the suggested measures to control the deformation of the structure are put forward.
【學位授予單位】：中國鐵道科學研究院
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU476
本文編號：2266517
[Abstract]:The counterweight pile plate retaining wall is a new type of retaining structure, which is composed of pile, lock beam, column plate wall and counterweight platform (unloading plate) and so on. The unloading plate with rigid connection with the wall body reduces the earth pressure acting on the lower structure of the unloading plate, and provides a reverse bending moment (relative to the moment caused by the earth pressure) for the pile, which makes the internal force distribution of the structure balanced. At the same time, the displacement trend of retaining structure leaving soil is limited. The load-deformation behavior of this kind of retaining wall is more complex than that of other kinds of pile-plate retaining wall because of the unloading action of unloading plate, the action of reverse bending moment and the interaction between structure and structure. In the previous research work, the mechanical characteristics of the structure have been deeply studied, but the deformation behavior of the retaining wall is not clear, and the deformation calculation method and the design method to control the deformation are still to be studied. This paper studies the deformation behavior of the counterweight pile plate retaining wall, puts forward the design method of deformation control, and further consummates the design theory, which has important theoretical and engineering practical significance for the further popularization and application of this kind of structure. Based on the elastic foundation beam method, the analytical analysis method of the internal force and deformation of the retaining wall of pile and plate is derived according to the "two-stage method". The calculated results of this method are compared with those of the finite element method of elastic bar system, and the calculated results are close to those of the finite element method, and compared with the results of model tests and field tests, the calculated results of this analysis method are in agreement with the measured results. The reliability and rationality of the method are verified. Using the analytical analysis method proposed in this paper, the influence of the buried depth and the width of the unloading plate on the deformation of the structure is studied. The reasonable buried depth and the position of the plate width of the unloading plate are analyzed. The results of the analysis are verified by the model test and the numerical analysis method. In addition, the effects of pile length, pile diameter and soil parameters on structural deformation are analyzed. By using FLAC software and considering the interaction of soil and structure, the numerical analysis of different construction sequence of fill retaining wall and excavated retaining wall is carried out, and the results are compared with the results of this analysis method and the finite element method of bar system. It is concluded that under the condition of considering the interaction between soil and structure, the deformation calculated by numerical analysis is relatively small, and the internal force and deformation of the excavated retaining wall calculated by incremental method and aggregate method are close to each other. The structural internal forces calculated by the incremental method and the aggregate method are close to each other, and the structural deformation calculated by the incremental method is larger than that by the aggregate method, which is closer to the measured results. Considering the interaction between soil and structure, the surface settlement behind the retaining wall of pile plate is analyzed by finite difference method. The surface settlement behind the wall is related to the location of the unloading plate. When the unloading plate is set in a reasonable position, the surface settlement behind the wall is a downward parabola, the influence range of the surface settlement is about 1.6 H, and the maximum value of the surface settlement is 0.5 H from the back of the wall. The maximum settlement of the surface is equal to the displacement of the top of the wall. The earth pressure, structural internal force and deformation of the retaining wall with counterweight pile and plate are tested on the spot by selecting one engineering example of filling retaining wall and excavating retaining wall. The measured results verify the unloading effect of unloading plate and the remaining earth pressure. The measured data of internal force and deformation are close to the results of numerical analysis and the analytical method in this paper. Finally, the deformation characteristics of the counterweight pile plate retaining wall are summarized, and the suggested range of the unloading plate and the suggested measures to control the deformation of the structure are put forward.
【學位授予單位】：中國鐵道科學研究院
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU476
【參考文獻】
相關(guān)期刊論文 前10條
1 施大震;路肩短卸荷板式擋土墻試驗研究及應用[J];安徽建筑;1996年02期
2 姚代祿;擋土墻土壓力非線性分布的研究[J];重慶交通學院學報;1984年03期
3 劉國彬,王印昌;實測鋼筋計應力推算地下連續(xù)墻彎矩方法探討[J];地下工程與隧道;2003年01期
4 方家強;;墻背卸荷式攪拌樁擋墻在基坑工程中的應用[J];福建建筑;2006年01期
5 周瑞忠,覃海嬰;樁土共同作用原理與變形土體側(cè)壓力研究[J];福州大學學報(自然科學版);1999年06期
6 趙明華;劉峻龍;劉建華;;雙層地基橫向受荷樁簡化計算方法研究[J];公路交通科技;2006年12期
7 張榮;;短卸荷板式路肩擋土墻試驗研究[J];甘肅科技;2010年03期
8 張文青;帶卸荷板的板墻式擋土墻在水利工程中的設計與應用[J];甘肅水利水電技術(shù);1996年01期
9 李偉;卸荷板式擋土墻在岸墻工程中的應用[J];甘肅水利水電技術(shù);2003年02期
10 趙新宇;淺談重力式方塊碼頭的卸荷板位置[J];海岸工程;1995年02期
相關(guān)博士學位論文 前1條
1 胡賀松;深基坑樁錨支護結(jié)構(gòu)穩(wěn)定性及受力變形特性研究[D];中南大學;2009年
，本文編號：2266517
本文鏈接：http://sikaile.net/kejilunwen/sgjslw/2266517.html
