高混凝土面板砂砾石坝填筑标准及其工程应用
发布时间：2018-12-13 00:21
【摘要】：近年来随着面板堆石坝的大规模建设和施工工艺水平的提升,大坝的规模及坝高在不断的刷新,因此坝体的填筑标准也不断的在提高,对于高坝尤其是200m级以上的高混凝土面板坝的填筑标准的要求就更高了。研究表明填筑标准越高对于大坝的沉降变形控制就越有利,而筑坝材料的力学特性和高面板坝结构特性对高混凝土面板砂砾料坝的填筑标准具有重要影响,所以确定合理的填筑标准是保障大坝施工质量和安全运行的关键因素。本文在总结已往工程经验和相关研究成果的基础上,并考虑到当前土石坝工程研究、设计和施工的实际情况,同时结合所承担的卡拉贝利面板砂砾石坝、阿尔塔什面板砂砾石—堆石混合坝和玉龙喀什面板砂砾石—堆石混合坝坝料填筑标准的研究课题,探讨和提出了确定高面板砂砾石坝填筑标准的若干原则和方法,对相关的影响因素进行了较为系统的研究分析:(1)探讨和提出了确定高面板砂砾石坝填筑标准的若干原则和方法。研究了坝高和碾压干密度对坝体沉降变形的影响关系,随着坝高的增加,沉降变形显著增加;随着干密度增大,沉降变形减小,但减小的幅度越来越小,甚至干密度达到一定数值后,基本不再变化。同时分析了碾压密实度的多个影响因素,认为坝越高需要碾压的密实度越大,力学特性好级配优的筑坝料容易压实,不同碾压机械适用不同的筑坝材料,得到的碾压效果也不一,碾压遍数越大、铺料厚度越薄压实密度越大。最后根据上述各方面因素相互之间的关系,提出若干碾压填筑标准的确定原则和方法,以控制大坝沉降变形保证大坝安全稳定为前提,同时兼顾工程建设经济效益,根据实际的工程条件来确定最合理的施工碾压参数。(2)通过现场和室内大型相对密度试验,研究了砂砾料相对密度指标的确定方法以及级配(含砾量)等相关因素的影响规律。论述了砂砾料现场大型相对密度试验和室内相对密度试验的原理方法和试验过程,并依托于阿尔塔什工程对两者进行了对比分析。研究结果表明最大、小干密度都与砂砾料的含砾量有关,且有一个最优含砾量。(3)通过现场碾压试验,系统研究了施工碾压参数对压实度的影响规律,研究分析了合理确定碾压参数(行车速度、铺层厚度、碾压遍数、加水量等)的过程、方法及关键环节。(4)归纳总结了 3个重大土石坝工程的现场及室内相对密度试验和现场碾压试验研究成果。例证了在确保坝体填筑质量达标和沉降变形可控的前提下,同时兼顾工程建设的经济效益,来确定碾压参数的合理性,并成功应用于工程实践。
[Abstract]:In recent years, with the large-scale construction of face rockfill dam and the improvement of construction technology level, the scale and height of the dam are constantly refreshed. The standard of high dam, especially high concrete slab dam of 200 m or above, is even higher. The study shows that the higher the filling standard is, the more favorable the settlement and deformation control will be, and the mechanical characteristics of dam materials and the structural characteristics of high face slab dam have important influence on the filling standard of high concrete sand-gravel dam. So determining reasonable filling standard is the key factor to guarantee dam construction quality and safe operation. On the basis of summing up the past engineering experience and related research results, and taking into account the actual situation of the current earth-rock dam engineering research, design and construction, and combining with the Carabel face sand-gravel dam, This paper deals with the research topics of the fill standards of the Altash sand-gravel rockfill dam and the Yulong Kashi mixed dam, and discusses and puts forward some principles and methods for determining the filling standard of the high face sand-gravel dam. The related factors are systematically studied and analyzed: (1) some principles and methods for determining the filling standard of high face sand-gravel dam are discussed and put forward. The influence of dam height and roller dry density on the settlement deformation of dam body is studied. With the increase of dam height, the settlement deformation increases significantly. With the increase of dry density, the settlement deformation decreases, but the extent of decrease becomes smaller and smaller, even when the dry density reaches a certain value, it basically does not change. At the same time, several factors affecting the compaction degree are analyzed. It is considered that the higher the dam is, the greater the compaction degree is, and the better the grade of mechanical properties is, the easier the compaction is, and the different rolling machines are suitable for different damming materials. The compaction effect is also different. The thicker the compaction density is, the greater the rolling times are. Finally, according to the relationship between the factors mentioned above, some principles and methods of determining the roller compaction standard are put forward, which take the control of dam settlement and deformation to ensure the safety and stability of the dam, and at the same time, the economic benefits of the project are taken into account. According to the actual engineering conditions to determine the most reasonable construction rolling parameters. (2) through the field and indoor large-scale relative density test, The determination method of relative density index of sand and gravel and the influence of gradation (gravel content) and other related factors are studied. This paper discusses the principle, method and process of large-scale relative density test and indoor relative density test of sand and gravel, and makes a comparative analysis based on Altash project. The results show that the maximum dry density is related to the gravel content of sand gravel, and there is an optimal gravel content. (3) the effect of rolling parameters on compaction degree is studied systematically through field compaction test. The process of reasonably determining rolling parameters (driving speed, layer thickness, rolling times, water addition, etc.) is studied and analyzed. Methods and key links. (4) the results of field and indoor relative density tests and field compaction tests of three major earth-rock dams are summarized. The rationality of roller compaction parameters is determined by taking into account the economic benefits of engineering construction on the premise of ensuring the quality of dam filling and the controllable settlement and deformation, and is successfully applied in engineering practice.
【学位授予单位】：中国水利水电科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV541.1
本文编号：2375507
[Abstract]:In recent years, with the large-scale construction of face rockfill dam and the improvement of construction technology level, the scale and height of the dam are constantly refreshed. The standard of high dam, especially high concrete slab dam of 200 m or above, is even higher. The study shows that the higher the filling standard is, the more favorable the settlement and deformation control will be, and the mechanical characteristics of dam materials and the structural characteristics of high face slab dam have important influence on the filling standard of high concrete sand-gravel dam. So determining reasonable filling standard is the key factor to guarantee dam construction quality and safe operation. On the basis of summing up the past engineering experience and related research results, and taking into account the actual situation of the current earth-rock dam engineering research, design and construction, and combining with the Carabel face sand-gravel dam, This paper deals with the research topics of the fill standards of the Altash sand-gravel rockfill dam and the Yulong Kashi mixed dam, and discusses and puts forward some principles and methods for determining the filling standard of the high face sand-gravel dam. The related factors are systematically studied and analyzed: (1) some principles and methods for determining the filling standard of high face sand-gravel dam are discussed and put forward. The influence of dam height and roller dry density on the settlement deformation of dam body is studied. With the increase of dam height, the settlement deformation increases significantly. With the increase of dry density, the settlement deformation decreases, but the extent of decrease becomes smaller and smaller, even when the dry density reaches a certain value, it basically does not change. At the same time, several factors affecting the compaction degree are analyzed. It is considered that the higher the dam is, the greater the compaction degree is, and the better the grade of mechanical properties is, the easier the compaction is, and the different rolling machines are suitable for different damming materials. The compaction effect is also different. The thicker the compaction density is, the greater the rolling times are. Finally, according to the relationship between the factors mentioned above, some principles and methods of determining the roller compaction standard are put forward, which take the control of dam settlement and deformation to ensure the safety and stability of the dam, and at the same time, the economic benefits of the project are taken into account. According to the actual engineering conditions to determine the most reasonable construction rolling parameters. (2) through the field and indoor large-scale relative density test, The determination method of relative density index of sand and gravel and the influence of gradation (gravel content) and other related factors are studied. This paper discusses the principle, method and process of large-scale relative density test and indoor relative density test of sand and gravel, and makes a comparative analysis based on Altash project. The results show that the maximum dry density is related to the gravel content of sand gravel, and there is an optimal gravel content. (3) the effect of rolling parameters on compaction degree is studied systematically through field compaction test. The process of reasonably determining rolling parameters (driving speed, layer thickness, rolling times, water addition, etc.) is studied and analyzed. Methods and key links. (4) the results of field and indoor relative density tests and field compaction tests of three major earth-rock dams are summarized. The rationality of roller compaction parameters is determined by taking into account the economic benefits of engineering construction on the premise of ensuring the quality of dam filling and the controllable settlement and deformation, and is successfully applied in engineering practice.
【学位授予单位】：中国水利水电科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV541.1
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