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探槽是地质普查用来揭露矿体和地表与基岩界线的一项常用手段，由于工程简单，施工地点分散，管理工作薄弱，加之施工方法不当，往往易于塌方，严重地威胁着施工人员的人身安全。为了安全施工，现根据以往施工经验，将探槽塌方的原因和预防措施概述于下。一、塌方原因1．沿山坡走向施工的探槽，上槽壁较易塌方，这种类型的探槽（见图1），上下两槽壁高低相差很大，上槽壁a，随着探槽的延深，槽壁悬空面增大，若槽壁
As a commonly used means of geological survey to expose ore body and the boundary between surface and bedrock, it is easy to collapse because of simple engineering, scattered construction site, weak management and improper construction methods, which threaten the construction workers seriously Personal safety. For safety construction, the reasons and precautions of trench collapse are summarized below based on previous construction experience. First, the cause of landslides Along the hillside to the construction of the probe channel, the upper slot wall is more prone to collapse, this type of probe (see Figure 1), the upper and lower two slot wall vary greatly, the upper slot wall a, with the deepening of the probe slot Wall dangling surface increases, if the groove wall