【摘要】 砒砂岩区是黄河中游集中的基岩产沙区,强烈的岩土侵蚀与砒砂岩的岩性密切相关。通过对砒砂岩原状样品的矿物组成、微结构的测试和定量分析表明:砒砂岩中岩石矿物的组成特征是以不稳定、易风化、亲水性强的粘土矿物为主;岩石微结构特征表现为颗粒大小悬殊、排列无序、孔隙发育、胶结物为粘土矿物,影响岩石的物理力学性质,降低了砒砂岩的抗风化、抗侵蚀性能。更多还原

【Abstract】 The soft rock area is a major sediments-producing area resulting from bedrock erosion in the middle valley of the Yellow River. Intense rock-soil erosion in this area is closely related to lithology of the soft rock. Mineral composition and microstructures of undisturbed soft rock samples were tested in laboratory to study the effect of soft rock lithology on anti-erodibility. The soft rock is dominated in mineral composition by clay minerals, which are unstable, liable to weathering, and highly hydrophilic. In addition, the microstructure characteristics of the soft rock, such as different grain sizes, unoriented arrangement, high porosity, and clay mineral cements, promote the weathering process. These characteristics have weakened the anti-erodibility of the soft rock.更多还原