【摘要】：為探討在開采擾動(dòng)作用下不同水固質(zhì)量比富水充填材料失穩(wěn)破壞時(shí)的特征與臨界條件、水固質(zhì)量比對(duì)富水充填材料變形特性的影響,通過(guò)蠕變、應(yīng)力-應(yīng)變等試驗(yàn),研究了不同應(yīng)力條件下不同水固質(zhì)量比富水充填材料的蠕變性能及應(yīng)力-應(yīng)變特征,并得到了不同水固質(zhì)量比充填材料失穩(wěn)破壞的臨界荷載。結(jié)果表明:富水充填材料在應(yīng)力水平較小時(shí),蠕變曲線有衰減階段和穩(wěn)定階段2個(gè)階段;當(dāng)應(yīng)力水平達(dá)到臨界荷載時(shí),蠕變曲線表現(xiàn)出3個(gè)階段,衰減階段、穩(wěn)定階段和加速階段;水固質(zhì)量比為1.7、2.0和2.5的充填材料失穩(wěn)破壞的臨界荷載分別為其28 d抗壓強(qiáng)度的92%、90%和85%,臨界荷載隨著水固質(zhì)量比的提高而降低;應(yīng)力-應(yīng)變關(guān)系曲線宏觀上有4個(gè)階段:初始變形階段,彈性階段,塑性變形階段和破壞階段;彈性模量隨著水固質(zhì)量比的提高而降低。
[Abstract]:In order to study the characteristics and critical conditions of unstable failure of water-rich filling materials with different water-solid mass ratios under mining disturbance, and the effect of water-solid mass ratio on deformation characteristics of water-rich filling materials, creep, stress-strain tests were carried out. The creep properties and stress-strain characteristics of water-rich filling materials with different water-solid mass ratios under different stress conditions were studied, and the critical loads of unstable failure of filling materials with different water-solid mass ratios were obtained. The results show that when the stress level is small, the creep curve has two stages: attenuation stage and stable stage, and when the stress level reaches critical load, the creep curve shows three stages and decay stage. In the stable stage and acceleration stage, the critical loads for the instability failure of filling materials with a water-solid mass ratio of 1.7 and 2.5 are 92 90% and 85% of the compressive strength of 28 days, respectively, and the critical load decreases with the increase of the mass ratio of water to solid. The stress-strain relationship curve has four stages: initial deformation stage, elastic stage, plastic deformation stage and failure stage, and the elastic modulus decreases with the increase of water-solid mass ratio.
【作者單位】： 北京科技大學(xué)土木與環(huán)境工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(編號(hào):1374036)
【分類號(hào)】：TD823.7

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