【摘要】：隨著經(jīng)濟增長和西部大開發(fā)戰(zhàn)略的實施,西部地區(qū)正展開史上最大規(guī)模的礦井建設,而凍結(jié)井壁突水、漏水的難題仍未從根本上解決�，F(xiàn)有的設計規(guī)范及手冊中的參數(shù)均是針對中、東部地區(qū)的,因此需考慮東、西部地區(qū)的地層差異來進行井壁滲漏水成因與防治研究。 本文以雙層鋼筋混凝土井壁結(jié)構為對象,通過相關實測和實驗得出了西部地層的凍結(jié)壓力及其基巖強度特性,并分析西部地區(qū)凍結(jié)井壁的受力特征以及水壓特性,得出外層井壁設計滿足穩(wěn)定性要求即可,而內(nèi)層井壁主要用于防水。視內(nèi)層井壁混凝土為多孔介質(zhì),考慮損傷軟化以及滲流作用,對高壓水作用下混凝土內(nèi)層井壁突水、漏水機理分析,得出混凝土井壁所能夠承受的臨界水壓值P0c隨著混凝土的孔隙率φ和損傷后的降模量與彈性模量之比Eλ/E的增加而降低,同時井壁的臨界塑性損傷區(qū)半徑也隨之減小。此外,利用ABAQUS軟件中混凝土損傷塑性模型,在高壓水作用下對內(nèi)層井壁考慮流固耦合作用進行數(shù)值模擬,得出井壁混凝土中的應力、位移增大且塑性損傷情況加重,對煤礦混凝土井壁的穩(wěn)定不利,采用滲流—應力耦合分析法能較真實的反映混凝土井壁的受力情況。 為防治凍結(jié)井壁發(fā)生突水、漏水破壞,提出使用低水化熱水泥并添加礦渣等摻合料來減小水泥用量,能夠在保證混凝土強度的前提下,降低凍結(jié)井壁混凝土水泥水化熱量,以減小溫度應力,從而抑制溫度裂紋的產(chǎn)生。同時通過高性能混凝土配置實驗,在凍結(jié)井壁混凝土中添加60kg/m3EUA-Ⅳ膨脹劑、0.9kg/m3聚丙烯纖維以及1.7%高效減水劑,能抑制混凝土收縮變形,提高井壁混凝土體積穩(wěn)定性和密實度,改善現(xiàn)行凍結(jié)井壁混凝土的易開裂和抗?jié)B特性,對在西部地區(qū)富水基巖段凍結(jié)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，

本文編號：2374644