九寨黄龙机场填方高边坡动力稳定性分析
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摘要
九寨黄龙机场工程土石方总量超过4?07 m3,填方边坡最大高度102 m。填方地基为砂层、卵石层、粉质粘土、砾岩及泥岩等组成的第四系河流沉积,结构复杂,物理力学特性变化大,场地附近有3条大的活动断裂,地震烈度为Ⅷ度。作为拟静力法计算结果的补充,用三维有限元与拟静力分析相结合的方法对填方高边坡动力稳定性进行研究。结果表明:在烈度为Ⅷ度的地震作用下,填体发生大规模整体滑移的可能性较小,但可能发生分离式破坏;受边界条件的控制,填体稳定性对来自岷江断裂方向的地震要比来自雪山断裂方向的地震更为敏感。
Jiuzhai-Huanglong airfield is located in high mountain-narrow valley area of the eastern fringe of Tibet plateau,about 450 km far from the northwest of Chengdu. The airfield is on the accumulated terrace of Min river and goes through five large scoured gutters. The maximum height of the fill slopes reaches 102 m and the total cubic meter of earth and stone exceeds 4?07 m3. The structure of the ground made of quaternary river sediments,which contain sand layers,pebble layers,sandy clay,conglomerate rock and mudrock,is complicated and its mechanical behavior varies greatly. There are three active faults near the airfield with earthquake intensity Ⅷ. A numerical method combining three dimensional finite element method with pseudostatic analysis is employed in the dynamic stability analysis of the high fill slope. The results reveal that under earthquake with intensity Ⅷ,the possibility of integral slide of high fill slope is small,but the slope maybe fails disassembly. The fill slope stability is more sensitive to the earthquakes from Min river fault than that from Xueshan fault,which is controlled mainly by the boundary conditions of the fill body.
Jiuzhai-Huanglong airfield is located in high mountain-narrow valley area of the eastern fringe of Tibet plateau,about 450 km far from the northwest of Chengdu. The airfield is on the accumulated terrace of Min river and goes through five large scoured gutters. The maximum height of the fill slopes reaches 102 m and the total cubic meter of earth and stone exceeds 4?07 m3. The structure of the ground made of quaternary river sediments,which contain sand layers,pebble layers,sandy clay,conglomerate rock and mudrock,is complicated and its mechanical behavior varies greatly. There are three active faults near the airfield with earthquake intensity Ⅷ. A numerical method combining three dimensional finite element method with pseudostatic analysis is employed in the dynamic stability analysis of the high fill slope. The results reveal that under earthquake with intensity Ⅷ,the possibility of integral slide of high fill slope is small,but the slope maybe fails disassembly. The fill slope stability is more sensitive to the earthquakes from Min river fault than that from Xueshan fault,which is controlled mainly by the boundary conditions of the fill body.
引文
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4张克绪,谢君斐.土动力学[M].北京:地震出版社,1989
5张咸恭,王思敬,张倬元等.中国工程地质学[M].北京:科学出版社,2000
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7王余庆,辛鸿博,高艳平等.预测岩土边坡地震崩滑的综合指标法研究[J].岩土工程学报,2001,23(3):311～14
8彭定,陈玲玲.三峡船闸高边坡在地震作用下的稳定性分析[J].长江科学院院报,2001,18(6):47～49
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