摘要
软弱夹层是控制岩体稳定的主要因素之一,特别是当它们泥化时,由于强度大为降低,其影响更大。本文从软弱夹层所处的地应力环境出发,分析了不同风化岩带由于地应力所产生的围压不同而引起软弱夹层在物理力学性质方面的差异。作者认为由于围压效应的存在,位于微风化岩带中的软弱夹层大都受到地应力所产生的较高围压限制,通常是不会发生泥化的。围压的高低是软弱夹层泥化的根本原因之一。
The formation of weak intercalations and their, stance features are strictly controlled by the surrounding geological environment, especially by the crustal stross. Release of the crustal stress causes the physical properties of the weak intercalations in the strongly weathered zone and moderately weathered zone to become poorer; thus argillization happens when they are saturated; and physical indices and mechanic strength indices drop down. On the contrary, the weak intercalations in the slingtly weathered or unweathered zone possess better physical properties and higher strength indices under confining pressure caused by the crustal stress. Even when the weak intercalations are saturated, argillization is impossible because the confining pressure is in excess of their expansive force. The indices obtained through the weak intercalation strength test carried out at present are much lower than their natural indices, for the release of confining pressure causes the weak intercalations to soak water and thus be argillized. So, these indices cannot represent their natural strength properties. The authors consider that the confining pressure caused by the crustal stress is the main cause for weak intercalation argillization.
出处
《地质论评》
CAS
CSCD
北大核心
1990年第2期160-167,共8页
Geological Review
