岷江上游某水电站工程边坡软岩的崩解特性研究

工程边坡内软岩分布较广,可区分为泥化夹层、煤、炭质页岩、泥质粉砂岩等4种典型岩组。软岩的发育特征、空间展布形态、崩解特性直接关系到边坡整体稳定性和支护措施的方案设计。在重点研究F3断层、L9、L10、Lc、L11等软带内所发育的几种典型软岩岩组的崩解特性后,获知该类软岩极易吸水,遇水后发生泥化、软化和崩解。通过循环崩解试验,发现工程区内软岩的崩解度与泥质含量和崩解次数具有很好的相关性。同时,根据崩解度与崩解物形态,对软岩进行定性划分,分别定出Ⅴ类崩解岩和5种崩解破坏形式。最后就崩解机理作进一步地深入探讨。该成果为指导类似的工程边坡软岩的崩解性试验研究提供新的思路。

SLAKING CHARACTERISTICS OF SOFT ROCK OF THE ENGINEERING SLOPE IN A HYDROELECTRIC STATION IN THE SOUTHWEST OF CHINA

The soft rock widely distributed in the engineering slope can be classified into four kinds: argillized seams,coal,carbonaceous shale, and pelitic siltstone.Its origination,spatial distribution and orientation,as well as slaking characteristics directly affect the stability of the slope and design of anchoring and other supports.A careful study of the slaking characteristics of several kinds of soft rock formations in soft zones such as faults F_3,L_9,L_(10),L_c,L_(11) etc.,uncover that the soft rock highly absorbs water,which facilitates argillization,softening,and slaking.A circulated slaking experiment shows that the degree of slaking is highly related to the ratio of clay in the soft rock and times of the slaking.According to the degree of the slaking and shape of the slaking substance,the slaking process can be divided into five types of slaking rock and 5 kinds of failure patterns.The paper further discusses the slaking mechanisms.