浑河断裂带地质灾害发育特征及其成因机制

浑河断裂带是辽宁抚顺地区最为重要的一条活动断裂。为了深入调查沿浑河断裂带地质灾害发育情况，了解灾害形成与先存断裂之间的关系，为同类型灾害的防治和预警提供科学依据。本文采用现场调查方法，结合地面变形监测资料，厘清了浑河断裂带灾害类型和发育规律，剖析了断裂带灾害的形成机理。研究结果表明：断裂隐伏区地裂缝发育，主要沿浑河断裂带分支断裂展布，裂缝延伸长度300～2 400 m；其成因是抚顺城区南部采矿活动诱发了先存软弱断裂面局部拉裂、张开，进而向地表扩展、贯通，形成地裂缝。在断裂延伸的基岩地区沿断裂破碎带及影响带发育小型滑坡，主滑方向与断裂走向垂直或大角度斜交；其形成机制与岩体内部发育的结构面有关，尤其是顺坡向优势结构面的发育，其与坡体耦合形成易滑结构体，在长期降雨作用下，结构面软化、贯通及岩土体加速蠕滑，最终形成滑坡。

Characteristics and Formation Mechanism of Geohazards in Hunhe Fault Zone

Hunhe fault is the most important active fault in Fushun City, Liaoning Province. In order to deeply investigate the development of geological disasters along Hunhe fault, understand the relationship between disaster formation and the pre existing faults, and provide scientific basis for the prevention and early warning of geohazards. In this paper, we adopted the field investigation method and the ground deformation monitoring data to study. The disaster types and characteristics of Hunhe fault zone are clarified, and the formation mechanism of the fault zone disaster is analyzed. The results show that the ground fissures distributed along the hidden fault area, and extended 3002 400 m; The mining activities in the south of Fushun City induced the local tension and opening of the pre existing weak fault surface, which then extended and penetrated to the surface to form ground fissures. In the bedrock area where the fault extends, small landslides distributed along the fracture and the affected zones of the fault, and the main sliding direction is perpendicular to the fault strike or inclined at a large angle. These landslide formation mechanisms are related to the structural plane inside the rock mass. Especially, the structural planes along the slope  were coupled with the slope to form a sliding structure. Under the action of long term rainfall, the structural planes soften, penetrate, and accelerate the creep deformation of rock and soil mass, and finally forms a landslide.