混凝土面板堆石坝坝体材料分区影响研究
发布时间：2018-08-08 19:24
【摘要】：随着我国水利工程事业的发展,在全国各地修建了大量的堆石坝,由于堆石坝块石大面积出露,使得坝体、坝坡与生态环境之间不和谐。目前虽然对于坝坡绿化生态修复虽然做了大量工作,但是工程上缺乏一种实质有效的坝坡绿化生态修复方法;因此本文提出一种管道栽培绿化装置布置在堆石坝下游坝坡实现绿化生态修复,利用ABAQUS仿真软件对布置栽培管道前后坝体应力应变进行分析。现有研究和实际工程表明堆石体各部位的应力应变受材料分区影响,深入研究坝体不同材料的分区,对于提高土石坝的安全性、经济性等具有重要的意义。本文结合丫多河面板堆石坝进行有限元仿真计算,分析坝体在不同材料分区情况下堆石坝的应力应变情况。本文的研究和结果如下:1、将管道栽培装置布置在某均质堆石坝下游坝坡,采用ABAQUS软件结合DuncanE-B模型计算坝体蓄水后在不同荷载、不同管道间距的应力应变。计算结果表明坝体应力最大增量最大为2KPa,坝体位移最大增量最大为0.05cm。对坝体的应力应变影响很小,对于坝体而言可以忽略不计。说明该技术方案是合理的、可行的,该技术方案可以应用到实际工程中去。2、建立丫多河水库面板堆石坝三维模型,分析坝体在竣工期、蓄水期的应力应变。结果表明坝体应力应变云图能够较好反映坝体的变形规律,模拟结果与实际工程经验相符合。将坝体按照不同主次堆石分界线坡度进行材料分区,结果表明随着次堆石区域的扩大,对坝体的水平位移、面板压应力、下游坝坡安全系数影响较小。坝体水平位移最大增大9cm,面板压应力最大变化为0.4MPa,安全系数最大减小0.25;随着次堆石区域的扩大,对坝体沉降、主应力、面板拉应力、面板挠度影响较大。坝体最大沉降增大24.92cm、坝体主应力最大增大0.157MPa、面板拉应力最大增大0.9MPa、面板挠度最大增大6.13cm。3、模拟了不同垫层厚度对堆石坝的影响,结果表明随着垫层增厚,对面板拉应力影响较大,拉应力最大增量为0.4MPa;对面板压应力、挠度影响较小,压应力最大变化值为0.2MPa,挠度最大增大2cm;垫层厚度变化对坝体没有影响,坝体沉降和坝体应力几乎没有变化。
[Abstract]:With the development of water conservancy engineering in China, a large number of rockfill dams have been built all over the country. Due to the large area of rockfill dams, the dam body, dam slope and ecological environment are not harmonious. Although a great deal of work has been done on the greening ecological restoration of dam slope at present, there is a lack of an effective ecological restoration method for the greening of dam slope in engineering. In this paper, a kind of pipeline planting and greening device is put forward to realize the greening ecological restoration on the dam slope downstream of rockfill dam. The stress and strain of the dam body before and after the arrangement of the cultivation pipeline are analyzed by using ABAQUS simulation software. The existing research and practical engineering show that the stress and strain of various parts of rockfill body are affected by material zoning. It is of great significance to study the zoning of different materials of dam body for improving the safety and economy of earth-rock dam. In this paper, the finite element simulation of Yaduo River rockfill dam is carried out, and the stress and strain of rockfill dam under different material zoning are analyzed. The research and results of this paper are as follows: 1. The pipeline cultivation device is arranged on the downstream dam slope of a homogeneous rockfill dam. The stress and strain of the dam under different loads and different pipeline spacing are calculated by ABAQUS software combined with DuncanE-B model. The results show that the maximum increment of stress is 2 KPA and the maximum increment of displacement is 0. 05 cm. The influence of stress and strain on dam body is very small and can be ignored. It is shown that the technical scheme is reasonable and feasible. It can be applied to practical engineering. The 3D model of Yaduohe reservoir face rockfill dam is established, and the stress and strain of the dam body in the period of completion and storage are analyzed. The results show that the stress-strain cloud map of the dam body can reflect the deformation law of the dam body, and the simulation results are in agreement with the actual engineering experience. According to the slope of different primary and secondary rockfill boundary, the results show that with the expansion of secondary rockfill area, the horizontal displacement of dam body, the compressive stress of face slab and the safety factor of downstream dam slope are less affected. The maximum horizontal displacement of the dam is increased by 9 cm, the maximum compressive stress of the face slab is 0.4 MPA, and the maximum safety factor is reduced by 0.25. With the expansion of the secondary rockfill area, the dam settlement, the principal stress, the tensile stress of the face slab and the deflection of the slab are greatly affected. The maximum settlement of the dam is increased by 24.92 cm, the main stress of the dam is increased by 0.157 MPa, the tensile stress of the face slab is increased by 0.9 MPA, and the maximum deflection of the face slab is increased by 6.13 cm 路3. The effects of different cushion thickness on the rockfill dam are simulated. The results show that with the thickness of the cushion, the tensile stress of the face slab is greatly affected. The maximum increment of tensile stress is 0.4MPa, the maximum variation of compressive stress is 0.2MPa, the maximum deflection is 2cm, the thickness of cushion has no effect on dam body, and the settlement and stress of dam body have no change.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV641.43
本文编号：2172808
[Abstract]:With the development of water conservancy engineering in China, a large number of rockfill dams have been built all over the country. Due to the large area of rockfill dams, the dam body, dam slope and ecological environment are not harmonious. Although a great deal of work has been done on the greening ecological restoration of dam slope at present, there is a lack of an effective ecological restoration method for the greening of dam slope in engineering. In this paper, a kind of pipeline planting and greening device is put forward to realize the greening ecological restoration on the dam slope downstream of rockfill dam. The stress and strain of the dam body before and after the arrangement of the cultivation pipeline are analyzed by using ABAQUS simulation software. The existing research and practical engineering show that the stress and strain of various parts of rockfill body are affected by material zoning. It is of great significance to study the zoning of different materials of dam body for improving the safety and economy of earth-rock dam. In this paper, the finite element simulation of Yaduo River rockfill dam is carried out, and the stress and strain of rockfill dam under different material zoning are analyzed. The research and results of this paper are as follows: 1. The pipeline cultivation device is arranged on the downstream dam slope of a homogeneous rockfill dam. The stress and strain of the dam under different loads and different pipeline spacing are calculated by ABAQUS software combined with DuncanE-B model. The results show that the maximum increment of stress is 2 KPA and the maximum increment of displacement is 0. 05 cm. The influence of stress and strain on dam body is very small and can be ignored. It is shown that the technical scheme is reasonable and feasible. It can be applied to practical engineering. The 3D model of Yaduohe reservoir face rockfill dam is established, and the stress and strain of the dam body in the period of completion and storage are analyzed. The results show that the stress-strain cloud map of the dam body can reflect the deformation law of the dam body, and the simulation results are in agreement with the actual engineering experience. According to the slope of different primary and secondary rockfill boundary, the results show that with the expansion of secondary rockfill area, the horizontal displacement of dam body, the compressive stress of face slab and the safety factor of downstream dam slope are less affected. The maximum horizontal displacement of the dam is increased by 9 cm, the maximum compressive stress of the face slab is 0.4 MPA, and the maximum safety factor is reduced by 0.25. With the expansion of the secondary rockfill area, the dam settlement, the principal stress, the tensile stress of the face slab and the deflection of the slab are greatly affected. The maximum settlement of the dam is increased by 24.92 cm, the main stress of the dam is increased by 0.157 MPa, the tensile stress of the face slab is increased by 0.9 MPA, and the maximum deflection of the face slab is increased by 6.13 cm 路3. The effects of different cushion thickness on the rockfill dam are simulated. The results show that with the thickness of the cushion, the tensile stress of the face slab is greatly affected. The maximum increment of tensile stress is 0.4MPa, the maximum variation of compressive stress is 0.2MPa, the maximum deflection is 2cm, the thickness of cushion has no effect on dam body, and the settlement and stress of dam body have no change.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV641.43
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