【摘要】：隨著面板堆石壩的不斷發(fā)展,擠壓邊墻施工技術在未來高面板堆石壩工程中被廣泛應用已經(jīng)成為一種趨勢。作為混凝土面板的基礎結構,擠壓邊墻的應力變形性態(tài)無疑將成為影響面板應力狀態(tài)的一個關鍵因素。然而,目前工程界對于擠壓邊墻破碎問題及其應力變形性態(tài)的認識還停留在定性推測階段,導致在對大壩進行應力變形數(shù)值模擬計算時一般都將擠壓邊墻及其應力變形性態(tài)按極端情況來進行近似模擬。因此,為提高高面板堆石壩應力變形數(shù)值模擬分析的精細度,深入開展擠壓邊墻的破碎機制研究是十分必要的。本文針對引起擠壓邊墻破碎的法向和順坡向壓力荷載作用這兩種主要荷載因素,運用試驗方法,進行了擠壓邊墻的破碎機制研究。首先,結合工程實際,進行了擠壓邊墻混凝土試件材料及結構模擬方法分析,包括配合比設計、試件模具設計、試件制作方法選擇,提出了能夠準確模擬擠壓邊墻的結構特征和受力狀態(tài)的面板—擠壓邊墻—墊層料模型試件制作方法;其次,運用大型粗粒土動靜三軸儀,針對不同配合比、不同搭接長度的面板—擠壓邊墻—墊層料模型試件,在不同圍壓條件下,分別進行了法向荷載及順坡向壓力荷載作用下的擠壓邊墻壓裂破碎機理試驗,獲得了在法向荷載及順坡向壓力荷載作用下擠壓邊墻壓裂破碎的演變規(guī)律及其裂縫的分布和變化規(guī)律,試驗結果表明:水灰比越大、圍壓越小、搭接長度越小時,裂縫出現(xiàn)的越早,擠壓邊墻的裂縫最早出現(xiàn)在搭接部位,并且逐步向厚度較大的中間部位發(fā)展,所有裂縫大致平行,方向近似垂直面板;在法向壓力荷載作用下,擠壓邊墻的抗壓強度與水灰比和圍壓有關,與搭接長度無關,隨著水灰比減小或者圍壓增大,擠壓邊墻的抗壓強度增大;在順坡向壓力荷載作用下,擠壓邊墻的最終破壞與擠壓邊墻的水灰比、搭接長度以及圍壓均無關。本文運用試驗手段研究高面板堆石壩擠壓邊墻的破碎機制,所得試驗結果對面板堆石壩的設計具有一定的參考價值。
[Abstract]:With the continuous development of face rockfill dam, it has become a trend that the construction technology of extruded side wall is widely used in the future high face rockfill dam project. As the foundation structure of concrete slab, the stress and deformation behavior of extruded side wall will undoubtedly become a key factor to affect the stress state of slab. However, at present, the understanding of the crushing problem of extruded sidewall and its stress-deformation behavior in engineering circles is still in the stage of qualitative conjecture. Therefore, in the numerical simulation of the stress and deformation of the dam, the extrusion side wall and its stress and deformation behavior are generally simulated according to extreme conditions. Therefore, in order to improve the fineness of numerical simulation analysis of stress and deformation of high face rockfill dam, it is necessary to deeply study the crushing mechanism of extruded sidewall. In this paper, the crushing mechanism of extruded sidewall is studied by means of experimental method, aiming at the two main load factors, normal and downhill pressure load, which cause the crushing of extruded sidewall. First of all, combined with the engineering practice, the material and structure simulation method of extruded side wall concrete specimen are analyzed, including mix ratio design, test die design, sample making method selection. In this paper, a method of making the model specimens of panel, extruded wall and cushion material, which can accurately simulate the structural characteristics and stress state of the extruded side wall, is presented. Secondly, the large coarse grained soil dynamic and dynamic triaxial apparatus is used to test the model specimens of panel, extruded sidewall and cushion material with different mixing ratio and different lap length, under different confining pressure conditions, Experiments on fracturing mechanism of extruded side wall under normal load and along slope pressure were carried out respectively. The evolution law of fracturing breakage and the distribution and variation of fracture under normal load and along slope pressure are obtained. The experimental results show that the larger the water-cement ratio, the smaller the confining pressure and the smaller the lap length. The earlier the cracks appear, the earliest cracks of the extruded side wall appear in the lap position, and gradually develop to the thick middle part, all the cracks are approximately parallel, the direction is similar to the vertical face; Under the normal pressure load, the compressive strength of the extruded side wall is related to the water-cement ratio and the confining pressure, but not to the lap length. With the decrease of the water-cement ratio or the increase of the confining pressure, the compressive strength of the extruded side wall increases. The ultimate failure of the extruded side wall is independent of the water-cement ratio, the lap length and the confining pressure. In this paper, the crushing mechanism of extruded sidewall of high face rockfill dam is studied by means of test, and the experimental results are of certain reference value for the design of face rockfill dam.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV641.43

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