天山公路K964+080～K964+125段滑坡形成条件、形成机制研究

天山公路是贯穿新疆天山南北的重要的交通要道,也是重要的国防战略通道。根据天山公路K964 080- K964 125段地形地貌、地质构造、地层岩性、水文地质条件、新构造运动及地震等区域地质状况和该段滑坡的基本特征,分析了该公路段滑坡的形成机理。天山公路4#滑坡为片岩组成的岩质滑坡,位于铁力买提达坂断裂和哈尔克山主断裂之间。陡倾的片岩在自重、构造等作用因素下产生卸荷,上部片岩向临空方向作悬臂梁弯曲,逐渐向坡内发展,形成弯曲-拉裂变形。滑坡坡体前缘公路的开挖,靠近临空面位置的变形体首先蠕滑或滑塌,后面的坡体形成临空或失去阻滑力而蠕滑,这样从前缘开始逐渐“追溯”,倾向坡外的拉裂面贯通后,形成蠕滑-拉裂滑坡。

Research of the Mechanism and the Formatting Condition about Tianshan Highroad of K964+80～K964+125

Tianshan highroad in Xinjiang Province is not only the important traffic path that run-throughs the south and north of Tianshan mountain, but also an important national defence channels. The formative mechanism of landslide in this highroad was analyzed, according to factors, namely: the landform and physiognomy, giological structure, stratum lithology, hydrological geological condition, new structural movement, and the geological condition of the earthquake areas, et al. , as well as the basic characteristics of the landslide section in the section of Tianshan highroad K964 080 ~ K964 125. The 4# landslide is composed of Schist between two faultages, located between the Eielimaiti Pass fault and the Hark Mountain main fault. The cliffy schist bends as cantilever beam toward the air because of gravity and geological structure and develops inside the slope little by little, forming a bend-rip deformation. As the screes by road are excavated, the deformation body close to the location of the hang-up side first glides or collapses, then the body of the landslide occurs the cavum below. The schist glides because of lack of resistance. In this way, the distortion and destroy backwards and form a surface at last. When the surface is run through, the landslide of the type of creepage-rip is formed.