【摘要】：分析深井煤巖試驗斷口上礦物、結構、構造等的細觀特征,追溯圍壓對其蠕變損傷機制的影響及調節(jié)作用,得到了圍壓分別為0、10和20 MPa的深井煤巖短時分級加載蠕變試驗破壞斷口的細觀構造,分別對應解理斷裂-節(jié)理裂隙、沿晶界斷裂、沿晶界斷裂-穿晶斷裂。圍壓為0 MPa的單軸蠕變試驗破壞斷口,是煤巖受簡單應力環(huán)境直接作用的結果,因此,其解理斷裂和節(jié)理裂隙構造清晰、方向明確、內部新鮮且無夾雜。圍壓為10 MPa三軸蠕變破壞斷口的沿晶界斷裂間隙較寬、內部不干凈、充填碎屑類夾雜,表明較強環(huán)向約束下的晶界較易于克服,且礦物結構以晶粒間的切向運動及力矩作用下的晶粒轉動方式調整。圍壓為20 MPa的三軸蠕變試驗,環(huán)向強約束使得晶界與晶粒的強度難以克服,最終破壞斷口上的沿晶界斷裂主要呈現(xiàn)弧形轉動,穿晶斷裂以剪切位移為主要特征,所以沿晶界斷裂構造不太干凈、內部充填圍壓先期作用時原生構造閉合后新產(chǎn)生的少量碎屑類夾雜,穿晶斷裂間隙極小、新鮮、干凈無夾雜。
[Abstract]:The microscopic characteristics of minerals, structures and structures on the test fracture surface of deep coal and rock are analyzed, and the influence of confining pressure on creep damage mechanism and its regulating action are analyzed. The microstructures of fracture surface destroyed by short-time graded loading creep test of coal and rock in deep wells with confining pressures of 0 ~ 10 and 20 MPa respectively are obtained, which correspond to cleavage fault-joint fracture and grain boundary fracture to transgranular fracture respectively. The failure fracture of uniaxial creep test with confining pressure of 0 MPa is the result of the direct action of coal and rock under simple stress environment. Therefore, the cleavage fracture and joint fracture have clear structure, clear direction, fresh interior and no inclusion. When the confining pressure is 10 MPa, the fracture gap along the grain boundary is wider, the interior is not clean, and the grain boundary is filled with clastic inclusions, which indicates that the grain boundary under strong circumferential constraint is easy to overcome. The mineral structure is adjusted by the tangential movement of the grains and the rotation of the grains under the action of torque. In the triaxial creep test with confining pressure of 20 MPa, the strength of grain boundary and grain is difficult to overcome due to the strong circumferential constraint, and the fracture along grain boundary at the end of the fracture presents an arc rotation, and the transgranular fracture is characterized by shear displacement. Therefore, the fault structure along grain boundary is not very clean, and a small amount of clastic inclusions are produced after the closure of the primary structure when the internal filling pressure is in advance. The transgranular fracture gap is very small, fresh and clean without inclusions.
【作者單位】： 山東農(nóng)業(yè)大學水利土木工程學院;中國科學院武漢巖土力學研究所;
【基金】：山東省自然科學基金項目(No.ZR2014DM019) 國家自然科學基金項目(No.51574156,No.51004098)~~
【分類號】：TD315

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