土石混合体原位水平推剪试验

In-situ Direct-shear Test on Rock-Soil Aggregate

在长江三峡库区沿岸普遍存在着由于滑坡、崩塌、风化卸荷、残坡积和冲洪积等复杂成因而形成的第四纪松散堆积体,其力学特性介于土体与碎裂岩体之间,为了强调其组成及结构上的特点,称之为"土石混合体"。在大量现场调查的基础上,对三峡库区土石混合体的成因进行了总结。在滑坡现场对土石混合体进行了原位压剪以及推剪试验研究,揭示土石混合体在原位受剪情形下的变形与破坏规律。

There is a lot of loose Quaternary deposit originated from landslide deposits, weathering residues, slope wash and diluvial deposits etc, prevails in the Three Gorges Reservoir area. The mechanical properties of the material are widely different from homogeneous and continuous soil. To emphasize its component and structural characteristic, this special geological material is termed as ＂rock-soil aggregate＂（RSA）in this dissertation. Based on the large number of geological investigations, the genesis types of RSA are generalized. In-situ direct-shear tests are conducted on the landslide. The deformation and failure mechanisms of RSA under shearing conditions are disclosed.