Safety Research Of High Concrete Faced Rock-fill Dam

The concrete faced rock-fill dam unfolds in reality safety, economy and compatible good characteristic, depth dam labor favor. After the unceasing construction and the research, technically obtained the considerable development, at present is constructing Chinese Shuibuya concrete faced rock-fill dam dam Gao Yida 233m. Although has achieved the outstanding achievement in concrete faced rock-fill dam's each aspect, but its design and the construction still relied on the quite great degree the experience, some projects after investment movement presents the kneading board to distort, the dehiscence, the leakage, even bursts the accident creates the serious people loss of life and property. Along with 300 meter level kneading board dam construction, as well as in macroseism, high and cold, deep overburden layer and in complex engineering geology build dams, theoretically studies the kneading board dam the secure question to have the vital practical significance systematically thoroughly.This topic in the system elaboration concrete faced rock-fill dam's developing process and in the design research present situation's foundation, from piles up stones the body stress distortion and the kneading board anti-crack two parts studies the concrete faced rock-fill dam the secure question, uses the finite element numerical analysis and the theory analysis method, the development take piles up stones the body stress distortion numerical simulation and the concretes kneading board anti-crack as the core research. Mainly includes the following several aspects the content:(1) Concrete faced rock-fill dam strain numerical analysis technique of simulation. The system introduced concrete faced rock-fill dam this modellings and the analogy procedure, including the rockfill, the kneading board, the joint stop the water, the contact face as well as the kneading board and the breaker strip escape the spatial simulation; As well as opens the model parameter to Duncan the sensitivity and the statistical analysis, thus cannot experiment then the full understanding model parameter change tendency and the numerical range.(2) Studies the deep overburden layer, the river valley geometrical shape, to pile up stones and face construction working procedure counter plate dam strain characteristic influence, obtains separately. First, Uses the part to dig out the overburden layer, to let the toe board be situated directly in the bedrock ground treatment way, is advantageous in improves kneading board's distortion and the stress, and roasts the board and the foundation suggested that uses the flexibility connection mode. Secondly, In the dam with the dam material determination invariable situation, in the narrow river valley the dam and kneading board's displacement value is smaller than in the wide river valley situation obviously high, but kneading board's stress is big in the narrow river valley situation. Third, Speaking of the improvement dam's distortion character, the dam reclamation should better be realizes the dam upstream, the downstream entire cross section balanced rise; For the reduced dam distortion counter plate stress's influence, kneading board's construction should better wait for after the dam distorts stable period of time, constructs again; From improves kneading board's stress to look that the kneading board one time constructs to goes against must surpass the kneading board to construct by stages relatively.(3) Concrete faced rock-fill dam transfusion, stability analysis research. Introduced the transfusion theory and the finite element analogy procedure, realized infiltrated the flow field analysis based on ADINA; Through to the commonly used dam slope stability analysis method's comparison, proposed that the computation side slope safety coefficient's revision specific weight increases the law and the slope to the centrifuge process.(4) The concrete face mechanics condition, cracks the mechanism, the influencing factor and the security evaluating indicator research. The dehiscence phenomenon which appears to the concretes kneading board carried on the stressful condition, to crack mechanism's analysis, conducted the research to each influencing factor, for example: Kneading board thickness, the kneading board ratio of reinforcement, the steel bar diameter, the reinforcing bars position, the thermal-expansion coefficient, the comprehensive temperature difference and so on, then the counter plate security evaluating indicator has carried on the discussion. Through the research analysis, has verified the crack occurrence developing process, has laid the foundation for the engineering design and the anti-crack research.(5) The concrete face anti-crack measure research. Summarizes in the system in the foundation, the anti-crack measure summary classification is three parts, including the structure measure, the material measure, the construction maintenance measure, and proposed that the double-decked kneading board structure anti-crack measure, has confirmed this measure feasibility through the analysis, and pointed out that optimizes through the dam structure district may play the reduced crack the role.