风化岩体水理特性试验及巷道破坏机理"

EXPERIMENTAL INVESTIGATIONS ON WATER-WEAKENING PROPERTIES OF WEATHERED ROCK MASSES AND FAILURE MECHANISM OF ROADWAYS

为了探明九顶山钼矿风化岩体的水理特性及其对巷道变形破坏的影响,开展了蚀变角岩、致密花岗斑岩及蚀变花岗斑岩的水理特性试验。结果表明,自然含水率、自由膨胀率及侧限膨胀率均是蚀变花岗斑岩最高,蚀变角岩次之,致密花岗斑岩最低。巷道变形破坏主要发生在蚀变角岩、蚀变花岗斑岩地段,其中岩石软化特性、易崩解性及物理环境起决定性作用,黏土矿物含量为内在因素,地下水为外在因素。

To investigate the water-weakening properties of weathered rock masses and their influences on roadways stabilities, water-weakening experiments were operated on altered hornstone, compact granite porphyry and altered granite porphyry. The results showed that altered granite porphyry ranked top on natural moisture content, natural swell ratio and lateral confinement swell ratio, followed sequentially by altered hornstone and compact granite por- phyry. Deformation and failure of roadways were usually induced by altered hornstone and altered granite porphyry, for which weakening property, disintegration tendency and physical environment were the key factors. In addition, the clay mineral content was the intrinsic factor for roadway failure, and underground water was the external factor.