巫山县新城区主要衍生地质灾害调查与评价

三峡水库区自然地质灾害调查和研究已广为报道。但对衍生地质灾害调查研究涉及甚少。三峡移民迁建的县城、乡镇和工厂多位于长江沿岸低山斜坡地带，迁建区内沟谷密布、切割强烈、地形复杂，几乎无可供成片建设的平坦地带。为满足移民工程的需求，迁建业主都采用“削坡填沟”的施工方式，即在道路、迁建场地内侧开挖高边坡，外侧修建挡土墙，并将开挖的弃土弃渣堆积于挡土墙内或冲沟中。这在道路、迁建场地两侧形成了众多的人工高边坡、高挡墙，沿冲沟堆放了成串的弃土弃渣。对巫山县新城区详细的衍生地质灾害调查表明，三峡移民迁建工程施工中开挖的高边坡、修建的挡土墙和沿冲沟堆放的弃土弃渣都不同程度地破坏了天然山坡的稳定性，堵塞了地表迳流的排泄途径，在某些地段存在发生崩塌、滑坡、泥石流等衍生地质灾害的内在因素．直接威胁移民建设工程。论文以巫山县新城区为重点，采用遥感调查与地面调查相结合的方法对人工高边坡、高挡墙和弃土弃渣堆放场进行调查评价。经调查共计人工高边坡、高挡墙、弃土弃渣堆放场122个，选定了重点监测对象20个，并对可能发生衍生地质灾害的3个地段进行了分析，为各级移民管理部门进行适时管理和决策提供现时性强、数据准确的资料。

Investigation and estimation on major derivative geological hazards in the new-built Wushan County

The emigration project in Three Gorges Project has been threatened by the derivative geological hazards of collapse and landslide and debris flow caused by the man-made high cutting slopes and high retaining walls and abandoned soil and dregs along the stormed cracks during the emigration construction engineering.The authors have made a thorough investigation using the method of remote sensing and field survey on the 122 high cutting slopes, high retaining walls and abandoned soil and dregs in the new-built Wushan County,among which,20 are selected as important monitoring objects and 3 regions probably derivating geological hazards are analysed.These can provide timely and exact data for the emigration administrative offices.