西南某电站坝址区岸坡深裂缝分布规律

Disquisition on Distributing Law of Bank Slope Deep Fracture of An Electricity Station Dam Site Section at Southwest

水电工程常常建在高山峡谷地带,其天然岸坡通常由坡面向内有一个强卸荷带和弱卸荷带以及相应的强风化和弱风化带,内侧则为完整新鲜的岩石。对涉及的工程岸坡在正常卸荷带以内发育了一系列张性破裂或破裂带,称之为"深拉裂缝",其分布规律的研究对其成因有着主要的作用,并在地层岩性、地质构造、河谷地貌、现今地应力场调查研究和深裂缝统计分析、声波测试、氡气测试、方解石测年、地应力测试等多种测试手段研究的基础上,对深裂缝的分布规律做了较为充分的论证。

Aqua electricity project is build on high mountain canyon tract whose natural slope is usually to has a zestier of strong unloading and a zestier of ebb unloading and corresponding zone of strong (or ebb) weathering, and there is integrity fresh rock in its inside. But there is a series of sheeted fracture or zone of fracture that was named as deep fracture is relate to a project. The research of the distributing law will be related to its formation cause importantly. The distribution law of deep fracture was illustrated sufficiently basis of geologic survey of strata and lithologic character, geological structure, river valley surface feature, present stress field in the Earth's crust, basis the tests results of deep fracture statistic analysis, sonic sounding, radon survey, age test of calcite, and in-situ stress survey, etc.