本文選題：尾礦壩 + 模袋法��； 參考：《北京科技大學(xué)》2017年博士論文

【摘要】：作為解決細(xì)粒尾礦堆壩問題的新技術(shù),模袋法堆壩將細(xì)粒尾礦充灌在設(shè)定的土工模袋內(nèi),利用模袋材料透水固砂、加速固結(jié)等優(yōu)點,實現(xiàn)細(xì)粒尾礦的快速安全堆壩,受到了細(xì)粒尾礦堆壩研究領(lǐng)域的普遍關(guān)注。模袋法技術(shù)最初發(fā)源于水利護坡領(lǐng)域,并形成了一系列的研究成果。本文將該技術(shù)成果成功引入到尾礦庫筑壩領(lǐng)域,研究發(fā)展了適合于尾礦庫筑壩的關(guān)鍵技術(shù),結(jié)合尾礦筑壩的特點和要求,本文重點研究了對于模袋法堆壩中特別關(guān)注的穩(wěn)定性作用機理及如何驗算的問題,形成的成果總結(jié)如下:(1)通過細(xì)粒尾礦模袋充灌試驗,探索了細(xì)粒尾砂模袋法堆壩的粒徑適用范圍。試驗結(jié)果表明:粒度+0.074mm在10%～20%,-0.045mm約70%的尾礦可直接實現(xiàn)模袋法堆砌子壩的筑壩方式,突破了該粒徑范圍內(nèi)不能采用尾礦直接筑壩的限制。(2)揭示了模袋壩的強度增強作用機理。結(jié)合模袋體強度增強機理分析和模袋體的多項力學(xué)特性試驗,對模袋體及模袋體間的力學(xué)特性進行了深入研究。由于土工袋張力的約束作用,模袋材料與尾砂共同發(fā)揮作用,使得模袋體較松散尾砂的抗剪強度明顯提高,增強了其整體性,使尾砂由"散體材料"變成具有"一定連續(xù)性的材料",壩體穩(wěn)定安全系數(shù)提高25%以上。(3)建立了模袋法尾礦壩的數(shù)值模擬和分析方法。本文通過水平條塊劃分并建立平衡方程的方法論證了模袋法尾礦壩的邊坡穩(wěn)定性。依據(jù)模袋壩體的破壞模式主要為袋與袋之間滑動的特性,采用接觸面單元模擬模袋體的層間接觸,結(jié)合抗剪強度折減法和接觸面有限單元法,計算分析了模袋壩的層間滑移破壞特征,得到了模袋體層間滑移變形與破壞過程。將上述研究結(jié)果應(yīng)用于兩個模袋法堆壩的工程實踐中,得到有效驗證。
[Abstract]:As a new technology to solve the dam problem of fine-grained tailings, the mold bag method fills the fine tailings into the set geo-mold bag, and makes use of the advantages of the mold bag material to permeate the sand and accelerate the consolidation, so as to realize the rapid and safe dam of the fine-grained tailings. It has received widespread attention in the field of fine tailing dam research. The technology of mould bag method originated in the field of water conservancy slope protection and formed a series of research results. In this paper, the technical achievements are successfully introduced into the field of tailings dam construction, and the key technologies suitable for the dam construction of the tailings reservoir are studied and developed, combining with the characteristics and requirements of the tailings dam construction. In this paper, the mechanism of stability and how to check calculation are studied, and the results are summarized as follows: 1) through the filling test of fine tailing mold bag, The application range of fine tailing sand bag method for dam diameter is explored. The test results show that the dam construction mode can be realized directly in the tailings of 10 ~ 20 ~ 0.045 mm tailings with grain size of 10 ~ 20% and 0.045 mm, which breaks through the limit of direct dam construction by tailings within the range of particle size, and reveals the mechanism of strengthening the strength of the dam. Based on the analysis of strength enhancement mechanism of mold bag and the experiment of several mechanical properties of mould bag, the mechanical properties of mould bag and mold bag are studied in depth. Because of the restraint of the soil bag tension, the mould bag material and the tailings act together, which makes the shearing strength of the loose tailings of the mold bag body increase obviously, and the integrity of the mold bag body is enhanced. The method of numerical simulation and analysis of tailings dam by mold bag method is established by changing tailing sand from "bulk material" to "material with certain continuity", and the safety coefficient of dam body stability is increased by more than 25%. In this paper, the slope stability of the tailings dam is proved by the method of dividing the horizontal strip and establishing the equilibrium equation. According to the failure mode of the dam, the contact surface element is used to simulate the interlayer contact of the bag body, combined with the shear strength reduction method and the contact surface finite element method. The interlayer slip failure characteristics of formwork bag dam are calculated and analyzed, and the slip deformation and failure process are obtained. The above research results are applied to the engineering practice of two formwork bag method, and the results are verified effectively.
【學(xué)位授予單位】：北京科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TD926.4

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