浅析面板堆石坝趾板混凝土裂缝控制措施

仙居县仙居盂溪水库趾板小体积混凝土筑完成后存在极少的裂缝,取得了好外观效果,本次趾板混凝土浇筑方式与仙居抽蓄上水库趾板浇筑进行对比分析,找出防止趾板裂缝产生的质量控制点,为今后类似工程提出一些合理化建议。

如何做好混凝土面板堆石坝施工质量的控制

随着水利建设快速发展,以及混凝土面板堆石坝设计的不断进步,混凝土面板堆石坝施工技术的成熟和完善。一个广阔发展前景的混凝土面板堆石坝,如何在工程施工过程中,严格控制施工质量,确保工程建筑和设备的安全运行,实现项目投资价值目标,作为建筑的主要任务。

瓦屋山水电站工程混凝土面板堆石坝原型观测设计

混凝土面板堆石坝是一种新坝型，面板坝的安全监测技术，对工程的安全至关重要。瓦屋山水电站混凝土面板堆石坝的原型观测重点是堆硒体、面板与周边缝的变形及渗流量观测。观测项目包括坝体变形、面板变形、渗流等。本文通过对四川眉山市洪雅县瓦屋山电站的设计剖析，结合实地地质地形条件，介绍了各观测项目的设计和仪器设备布置。

砼面板堆石坝施工质量控制

混凝土面板堆石坝是60年代后期在国际上兴起的新坝型,以其安全性、经济性、适应性好等特点,而受到坝工界普遍重视。混凝土面板堆石坝因其具有充分利用当地材料、施工方便、节省投资等诸多优点,其发展速度很快,随着我过水利水电建设的发展,以及混凝土面板堆石坝设计方面的不断进步,混凝土面板堆石坝施工工艺日趋成熟和完善。对于有着广阔发展前景的面板堆石坝,如何在其工程建施工过程中,严格控制施工质量,以确保工程建筑物及设备运行的安全,实现项目投资价值目标,是作为工程建设者的首要任务。

唐河水库混凝土面板堆石坝趾板施工方法

唐河水库属我省35项应急水源工程之一,位于灵丘县韩淤地村西,主要由大坝枢纽、供水发电引水管线及发电站组成。大坝从左岸至右岸,依次布置混凝土重力坝段、灌溉洞、供水发电引水口、泄洪冲沙闸、混凝土面板堆石坝段。趾板处在混凝土面板下部,是混凝土面板的基础,对于堆石坝的防渗起着至关重要的作用。文章详细介绍了趾板的施工方法。

下板地堆石坝深覆盖层沥青混凝土防渗心墙应力应变分析

采用了有效的地震输入方式和等效粘弹性本构模型,对深覆盖层(147.95 m)沥青混凝土心墙土石坝进行了有限元动态特性分析,并着重对防渗墙的应力应变进行了分析研究,给出了大坝竣工期、水库蓄水期防渗墙的应力和变形随墙体参数变化而变化的规律,为防渗墙墙体材料的选择提供了理论依据。

面板堆石坝的技术探讨

结合万安溪面板坝工程建设，开展了由部立项的“混凝土面板堆石坝新技术全面推广应用与开发研究”。作者通过实践和学习国内外面板坝建设的经验教训，对面板坝的勘测设计和施工导流特点，石料场，掺配花岗岩粗砂垫层料，混凝土面板抗裂技术及面板坝的发展等进行了探讨。

面板坝垂直缝失效渗流场有限元模拟

以班多面板堆石坝为例,用有限元方法计算了当面板缝局部失效时各种工况下的渗流场,系统分析了大坝在面板垂直缝局部失效后的稳定渗流场的规律和特点。通过分析计算结果,指出了面板缝的失效位置、失效缝宽、失效缝长以及垫层的渗透系数对等势线和浸润线的影响,并且对面板、垫层和接缝的设计提出建议。

论复合土工膜堆石坝防渗面板的有效应用和施工

文章首先对复合土工膜的工艺原料、应用范围以及特点进行了研究与分析,并以杉木湖水库一号副坝为例分析了复合土工膜在堆石坝防渗板中应用的具体施工流程、注意事项以及检查方法。

南水北调西线第一期工程引水枢纽建坝工程地质条件评价

从工程地质条件出发，分析评价了南水北调西线第一期工程五个引水枢纽所选坝段的工程地质条件。分析表明：五个引水枢纽所选坝段的工程地质条件满足修建中坝、高坝的基本地质要求, 不存在制约建坝的重大工程地质问题。从工程地质角度推荐坝型采用混凝土面板堆石坝。

曼格罗夫溪坝坝体性状及其监测

澳大利亚的曼格罗夫溪大坝为一座混凝土面板堆石坝，堆石体主要为砂岩和粉砂岩，最大坝高80m，于1982年竣工。对该坝建成后的监测结果进行了介绍，并对大坝的性状，包括渗透情况、面板的状态、接缝及沉陷量等作了较为详细的叙述。

Technical Progress on Researches for the Safety of High Concrete-Faced Rockfill Dams

The concrete-faced rockfill dam(CFRD) is an important dam type in the selection of high dams to be constructed in Western China,owing to its direct utilization of local materials,good adaptability,and distinct economic advantages.Over the past decades,China has gained successful experience in the construction of 200 m CFRDs,providing the necessary technical accumulation for the development of 250–300 m ultra-high CFRDs.This paper summarizes these successful experiences and analyzes the problems of a number of major 200 m CFRDs around the world.In addition,it discusses the key technologies and latest research progress regarding safety in the construction of 250–300 m ultra-high CFRDs,and suggests focuses and general ideas for future research.

Fuzzy Earthwork Dynamic Allocation and Optimization for Construction of High Concrete Face Rockfill Dam

Due to the complexity of earthwork allocation system for the construction of high concrete face rockfill dam,traditional allocation and planning are not able to function properly in the construction process with strong randomness.In this paper,the working mechanism of earthwork dynamic allocation system is analyzed comprehensively and a solution to fuzzy earthwork dynamic allocation is proposed on the basis of uncertain factors in the earthwork allocation of a hydropower project.Under the premise of actual situation and the experience of the construction site,an all-coefficient-fuzzy linear programming mathematical model with fuzzy parameters and constraints for earthwork allocation is established according to the structure unit weighted ranking criteria.In this way,the deficiency of certain allocation model can be overcome.The application results indicate that the proposed method is more rational compared with traditional earthwork allocation.

Distribution of acceleration and empirical formula for calculating maximum acceleration of rockfill dams

To find the distribution patterns of dynamic amplification coefficients for dams subjected to earthquake, 3D seismic responses of concrete-faced rockfill dams with different heights and different shapes of river valley were analyzed by using the equivalent-linear model. Statistical analysis was also made to the seismic coefficient, and an empirical formula for calculating the maximum acceleration was provided. The results indicate that under the condition of the same dam height and the same base acceleration excitations, with the increase of the river valley width, the position of the maximum acceleration on the axis of the top of the dam moves from the center to the riversides symmetrically. For the narrow valleys, the maximum acceleration occurs in the middle of the axis at the top of the dam; for wide valleys the maximum acceleration appears near the riversides. The result negates the application of 2D dynamical computation for wide valleys, and shows that for the seismic response of high concrete-faced rockfill dams, the seismic coefficient along the axis should be given, except for that along the dam height. Seismic stability analysis of rockfill dams using pseudo-static method can be modified according to the formula.

The Deformation and Stress Analysis of Na Ba Reservoir Concrete Face Rock-Fill Dam

Based on the APDL （ANSYS Parametric Design Language） and combined with the actual project related to parameters of filling material, imported Duncan-Chang constitutive model which has been widely applied in soil mass and rock-fill in the ANSYS software. With the three-dimensional nonlinear finite element analysis by the mid-point incremental method, what have been computed are the deformation and stress analysis ofNa Ba reservoir CFRD （Concrete Face Rock-fill Dam） in filling period. The calculation results provide practical reference for the dam during construction safety filling stress and deformation analysis and real-time monitoring.

Discussion on construction and type selection of China high dams

At the beginning of 21st century, with the rapid and steady development of China economy, a lot of large scale hydropower projects with large dams from 200 m to 300 m high are being or to be built. China dam constructions are reaching the level of 300 m high arch dam, 250 high CFRD (concrete face rockfill dam) and 200 m high RCC (roller compacted concrete) gravity dam. Due to the safety and the economy, the type selection for high dams has become the key issue during the argumentation for the hydropower projects, and further efforts are still needed in this aspect for high dams. After reviewing the high dam constructions in China and abroad, authors proposed some advices for the selection of dam types, and hope that it can provide some helpful information for the researches and the design of high dams.

Study on main contents of design of rock fill dam with face slab

With the development of economy, the adjustment of industrial structure, the improvement of people＇s living standard and the expansion of urbanization, the structure of the city has changed a lot. The proportion of industrial use of electricity decreased year by year, the proportion of household electricity, commercial electricity and public utilities increased year by year, the peak and valley change increased year by year. Therefore, the construction of hydropower project, to improve the current situation of the system of regulating the power grid, has a positive role in promoting. Reinforced rock fill dam with face slab in foreign countries has been built and at the dam more than 50m high dam more than 70 seats, of which more than 100m high dam 18. At present, Brazil estuary aliya rock fill dam is the highest dam in this kind of dam in the world, built in 1980, has been running well. Our reinforced rock fill dam with face slab design and construction technology in the introduction of digestion and absorption of foreign advanced experience in the foundation, the systemic research on a considerable scale. The design level and construction technology of the rock fill dam with face slab in our country have reached the international advanced level by the complete technology of the construction of the 100m level rock fill dam with face slab. This paper mainly from the rock fill dam with face slab, dam type selection and layout of water conservancy project comparison; dam profile design; detail dam; dam high determined; stability analysis; strength calculation; overflow capacity check aspects were studied.

Stress-dilatancy of Zipingpu gravel in triaxial compression tests

Experimental investigations of the dilatancy and particle breakage of gravelly material from the Zipingpu concrete-faced rock- fill dam, which was subjected to high-intensity seismic load during the 2008 Wenchuan earthquake, were conducted through a series of large-scale drained triaxial compression tests. A hyperbolic relation between the input plastic work and the degree of particle breakage was found for Zipingpu gravel, independent of the initial void ratio and confining pressures. The stress-dilatancy for Zipingpu gravel was analyzed and compared with data from two rounded alluvial and three angular quar- ried gravelly and rockfill materials in the literature. A nearly linear relationship between the dilatancy Dp and the stress ratio η was found at medium-to-large stress ratios before the peak stress ratio. The slope of the stress-dilatancy line before peak had slight dependence on the void ratio and confining pressure of the gravel. After peak, the stress-dilatancy relation shifts down compared with that before peak for the gravel specimen. The phase-transformation stress ratio decreased with increased con- fining pressure, with the exception of sub-rounded gravel with little particle breakage. A nearly linear relationship was found between the phase-transformation stress ratio Mf and the state parameter ψ for the Zipingpu gravel, regardless of the void ratio and confining pressure of the specimens.

Numerical simulation of the separation between concrete face slabs and cushion layer of Zipingpu dam during the Wenchuan earthquake

The Zipingpu concrete-faced rockfill dam(CFRD)experienced strong ground motion from the 2008 Wenchuan earthquake.Separation between concrete face slabs and the cushion layer was observed after the earthquake.The separation voids under the stage III slabs make up 55%of the total area of the stage III slabs.The observed maximum height of the separation voids was nearly 23 cm at the top of the stage III slabs.Separation voids were also observed locally below the top of stage II slabs near the left abutment,with a maximum height of 7 cm.In this study,a static and dynamic elasto-plastic finite element analysis on Zipingpu CFRD was conducted to capture the separation during the Wenchuan earthquake.The rockfill materials were described using a state-dependent elasto-plastic model that considered particle breakage.The model parameters of rockfill materials were obtained from feedback analysis.The numerical results were largely consistent with the field measurements during construction and after the Wenchuan earthquake.A three-dimensional state-dependent elasto-plastic model that can trace the separation and re-contact of a soil-structure interface was employed to investigate the interaction between concrete face slabs and a cushion layer.The analysis showed the distribution of separation voids observed in the Zipingpu CFRD has a close relationship to the water level and slab dislocations at the time of the earthquake.The phenomenon of the separation from the Wenchuan earthquake was successfully captured by the proposed numerical procedure.

Parameter sensitivity and inversion analysis of a concrete faced rock-fill dam based on HS-BPNN algorithm

Considering the complex nonlinear relationship between the material parameters of a concrete faced rock-fill dam(CFRD) and its displacements, the harmony search(HS) algorithm is used to optimize the back propagation neural network(BPNN), and the HS-BPNN algorithm is formed and applied for the inversion analysis of the parameters of rock-fill materials. The sensitivity of the parameters in the Duncan and Chang's E-B model is analyzed using the orthogonal test design. The case study shows that the parameters φ0, K, Rf, and Kb are sensitive to the deformation of the rock-fill dam and the inversion analysis for these parameters is performed by the HS-BPNN algorithm. Compared with the traditional BPNN, the HS-BPNN algorithm exhibits the advantages of high convergence precision, fast convergence rate, and strong stability.