西部地区深基岩冻结井筒井壁漏水成因与防治措施
发布时间：2018-12-12 13:23
【摘要】：随着经济增长和西部大开发战略的实施,西部地区正展开史上最大规模的矿井建设,而冻结井壁突水、漏水的难题仍未从根本上解决。现有的设计规范及手册中的参数均是针对中、东部地区的,因此需考虑东、西部地区的地层差异来进行井壁渗漏水成因与防治研究。 本文以双层钢筋混凝土井壁结构为对象,通过相关实测和实验得出了西部地层的冻结压力及其基岩强度特性,并分析西部地区冻结井壁的受力特征以及水压特性,得出外层井壁设计满足稳定性要求即可,而内层井壁主要用于防水。视内层井壁混凝土为多孔介质,考虑损伤软化以及渗流作用,对高压水作用下混凝土内层井壁突水、漏水机理分析,得出混凝土井壁所能够承受的临界水压值P0c随着混凝土的孔隙率φ和损伤后的降模量与弹性模量之比Eλ/E的增加而降低,同时井壁的临界塑性损伤区半径也随之减小。此外,利用ABAQUS软件中混凝土损伤塑性模型,在高压水作用下对内层井壁考虑流固耦合作用进行数值模拟,得出井壁混凝土中的应力、位移增大且塑性损伤情况加重,对煤矿混凝土井壁的稳定不利,采用渗流—应力耦合分析法能较真实的反映混凝土井壁的受力情况。 为防治冻结井壁发生突水、漏水破坏,提出使用低水化热水泥并添加矿渣等掺合料来减小水泥用量,能够在保证混凝土强度的前提下,降低冻结井壁混凝土水泥水化热量,以减小温度应力,从而抑制温度裂纹的产生。同时通过高性能混凝土配置实验,在冻结井壁混凝土中添加60kg/m3EUA-Ⅳ膨胀剂、0.9kg/m3聚丙烯纤维以及1.7%高效减水剂,能抑制混凝土收缩变形,提高井壁混凝土体积稳定性和密实度,改善现行冻结井壁混凝土的易开裂和抗渗特性,对在西部地区富水基岩段冻结井壁突水、漏水能起到很好的防治作用。
[Abstract]:With the economic growth and the implementation of the western development strategy, the western region is carrying out the largest mine construction in the history, but the problem of freezing the shaft wall water inrush, the problem of water leakage has not been solved fundamentally. The existing design specifications and the parameters in the manual are aimed at the middle and eastern regions, so the formation difference in the east and west regions should be considered to study the causes and prevention of wellbore leakage. Taking double-deck reinforced concrete shaft wall structure as the object, the freezing pressure and its bedrock strength characteristics of the western formation are obtained by relevant measurements and experiments, and the mechanical and hydraulic characteristics of the frozen shaft lining in the western region are analyzed. It is concluded that the outer wall design can meet the requirements of stability, while the inner shaft wall is mainly used for waterproof. Considering damage softening and percolation, the mechanism of water inrush and leakage in inner wall of concrete under high pressure water is analyzed. It is concluded that the critical water pressure value P0c of concrete shaft wall decreases with the increase of porosity 蠁 and the ratio of modulus of elasticity to modulus of elasticity E 位 / E, and the radius of critical plastic damage zone of the shaft wall decreases with the increase of the porosity of concrete and the ratio of modulus of elasticity to modulus of elasticity after damage. In addition, the damage plastic model of concrete in ABAQUS software is used to simulate the fluid-solid coupling of inner shaft wall under high pressure water. It is concluded that the stress, displacement and plastic damage in lining concrete are increased and plastic damage is aggravated. It is unfavorable to the stability of concrete shaft lining in coal mine. The seepage stress coupling analysis method can reflect the stress of concrete shaft wall more realistically. In order to prevent water inrush and water leakage of frozen shaft wall, it is put forward that using low hydration heat cement and adding slag and other admixtures to reduce cement dosage can reduce hydration heat of frozen shaft wall concrete under the premise of ensuring concrete strength. In order to reduce the temperature stress, so as to restrain the temperature crack. At the same time, through the experiment of high performance concrete configuration, adding 60kg / m ~ 3 EUA- 鈪，
本文编号：2374644
[Abstract]:With the economic growth and the implementation of the western development strategy, the western region is carrying out the largest mine construction in the history, but the problem of freezing the shaft wall water inrush, the problem of water leakage has not been solved fundamentally. The existing design specifications and the parameters in the manual are aimed at the middle and eastern regions, so the formation difference in the east and west regions should be considered to study the causes and prevention of wellbore leakage. Taking double-deck reinforced concrete shaft wall structure as the object, the freezing pressure and its bedrock strength characteristics of the western formation are obtained by relevant measurements and experiments, and the mechanical and hydraulic characteristics of the frozen shaft lining in the western region are analyzed. It is concluded that the outer wall design can meet the requirements of stability, while the inner shaft wall is mainly used for waterproof. Considering damage softening and percolation, the mechanism of water inrush and leakage in inner wall of concrete under high pressure water is analyzed. It is concluded that the critical water pressure value P0c of concrete shaft wall decreases with the increase of porosity 蠁 and the ratio of modulus of elasticity to modulus of elasticity E 位 / E, and the radius of critical plastic damage zone of the shaft wall decreases with the increase of the porosity of concrete and the ratio of modulus of elasticity to modulus of elasticity after damage. In addition, the damage plastic model of concrete in ABAQUS software is used to simulate the fluid-solid coupling of inner shaft wall under high pressure water. It is concluded that the stress, displacement and plastic damage in lining concrete are increased and plastic damage is aggravated. It is unfavorable to the stability of concrete shaft lining in coal mine. The seepage stress coupling analysis method can reflect the stress of concrete shaft wall more realistically. In order to prevent water inrush and water leakage of frozen shaft wall, it is put forward that using low hydration heat cement and adding slag and other admixtures to reduce cement dosage can reduce hydration heat of frozen shaft wall concrete under the premise of ensuring concrete strength. In order to reduce the temperature stress, so as to restrain the temperature crack. At the same time, through the experiment of high performance concrete configuration, adding 60kg / m ~ 3 EUA- 鈪，
本文编号：2374644
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2374644.html
