1296 工程科学学报.第42卷，第10期 500000 8000 6 500000 10000 (a) 6 7000 (b) -Stress 5 400000 Stress 400000 8000 Total cracks 6000 Total cracks Crack increment Crack increment 4 300000 5000 300000 6000 4000 3 200000 3000 200000 4000 2 2000 100000 100000 2000 1000 0 0.4 0.81.2 1.6 0.5 1.0 1.5 2.0 Strain/% Strain/% 图12分层充填体应力-应变曲线、裂纹累积曲线及裂纹增量曲线复合图.(a)高度比0.4、灰砂比1：4：(b)高度比0.4、灰砂比1：8 Fig.12 Composite plots of stress-strain curve,crack cumulative curve and crack increment curve of interbedded backfills:(a)height ratio of 0.4 and cemented tailings ratio of 1 4;(b)height ratio of 0.4 and cemented tailings ratio of 1 8 在较低水平波动、然后快速上升、最后又出现一 3.6破坏模式分析 定程度下降并处于较高水平进行波动 表7所示为不同分层充填体试件破坏模式及 表7分层充填体破坏模式 Table 7 Failure modes of interbedded backfill Cement- Height ratio 0.2 Height ratio 0.4 Height ratio 0.6 Height ratio 0.8 Failure mode analysis tailings ratio Keeping the tailing cement ratio at 4,when the height ratio is 0.2,it is mainly shown as tensile failure through the stratification plane;when the height ratio increases to 0.4,it is :4 mainly shown as tensile shear failure;when the height ratio continues to increase to 0.6,it is mainly shown as tensile failure in the parallel loading section;when the height ratio increases to 0.8,it is mainly shown as tensile failure in the middle weak layer. Keep the tailing cement ratio of 6,when the height ratio is 0.2,the failure mainly occurs in the middle weak layer and penetrates the upper and lower layers;when the height ratio is 1:6 0.4,the middle weak layer takes the lead in the occurrence of multiple tension cracks;when the height ratio is increased to 0.6,the specimen shows a large shear crack failure through the weak layer,when the height ratio is increased to 0.8,the middle weak layer presents conjugate shear failure. When the height ratio is 0.2 and 0.4,the failure mode is basically similar,which mainly appears in the middle weak layer and is mainly tensile failure;when the height ratio 1:8 ncreases to 0.6,it mainly appears as the main shear failure of the weak layer and accompanied by the secondary tensile crack failure;when the height ratio is 0.8,it mainly appears as the conjugate shear failure of the middle weak layer. All the failures are concentrated in the middle weak layer, 1:10 when the height ratio is 0.2 and 0.4,it is mainly tensile failure;when the height ratio is 0.6 and 0.8,it is mainly conjugate shear failure with secondary tensile crack. Note:Yellow indicates CPB and red indicates internal crack在较低水平波动、然后快速上升、最后又出现一 定程度下降并处于较高水平进行波动. 3.6    破坏模式分析 表 7 所示为不同分层充填体试件破坏模式及 0 0.4 0.8 1.2 1.6 2.0 0 1 2 3 4 5 6 7 (a) Stress Total cracks Crack increment Strain/% Stress/MPa 0 100000 200000 300000 400000 500000 0 1000 2000 3000 4000 5000 6000 7000 8000 Crack increment Total cracks (b) Stress Total cracks Crack increment 0 0.5 1.0 1.5 2.0 0 1 2 3 4 5 6 Strain/% Stress/MPa 0 100000 200000 300000 400000 500000 0 2000 4000 6000 8000 10000 Crack increment Total cracks 图 12    分层充填体应力–应变曲线、裂纹累积曲线及裂纹增量曲线复合图. （a）高度比 0.4、灰砂比 1∶4；（b）高度比 0.4、灰砂比 1∶8 Fig.12    Composite plots of stress-strain curve, crack cumulative curve and crack increment curve of interbedded backfills: (a) height ratio of 0.4 and cemented tailings ratio of 1∶4; (b) height ratio of 0.4 and cemented tailings ratio of 1∶8 表 7 分层充填体破坏模式 Table 7 Failure modes of interbedded backfill Cement￾tailings ratio Height ratio 0.2 Height ratio 0.4 Height ratio 0.6 Height ratio 0.8 Failure mode analysis 1∶4 Keeping the tailing cement ratio at 4, when the height ratio is 0.2, it is mainly shown as tensile failure through the stratification plane; when the height ratio increases to 0.4, it is mainly shown as tensile shear failure; when the height ratio continues to increase to 0.6, it is mainly shown as tensile failure in the parallel loading section; when the height ratio increases to 0.8, it is mainly shown as tensile failure in the middle weak layer. 1∶6 Keep the tailing cement ratio of 6, when the height ratio is 0.2, the failure mainly occurs in the middle weak layer and penetrates the upper and lower layers; when the height ratio is 0.4, the middle weak layer takes the lead in the occurrence of multiple tension cracks; when the height ratio is increased to 0.6, the specimen shows a large shear crack failure through the weak layer; when the height ratio is increased to 0.8, the middle weak layer presents conjugate shear failure. 1∶8 When the height ratio is 0.2 and 0.4, the failure mode is basically similar, which mainly appears in the middle weak layer and is mainly tensile failure; when the height ratio increases to 0.6, it mainly appears as the main shear failure of the weak layer and accompanied by the secondary tensile crack failure; when the height ratio is 0.8, it mainly appears as the conjugate shear failure of the middle weak layer. 1∶10 All the failures are concentrated in the middle weak layer, when the height ratio is 0.2 and 0.4, it is mainly tensile failure; when the height ratio is 0.6 and 0.8, it is mainly conjugate shear failure with secondary tensile crack. Note: Yellow indicates CPB and red indicates internal crack. · 1296 · 工程科学学报，第 42 卷，第 10 期