岩土工程学报2016，Vol.38Issue(z2)：161-166,6.DOI:10.11779/CJGE2016S2026
不同含石量条件下堆积体抗剪强度特性的大型直剪试验研究
Large-scale direct shear tests on accumulation body with different stone contents
摘要
Abstract
The accumulation bodies composed of soil-rock mixture are widely distributed in China. The deformation and stability of huge and large-scale loose accumulation bodies in reservoir areas are extremely concerned during construction of hydroelectric projects. Aiming at the complex property and material composition of accumulation slopes, the typical accumulation slopes in Three Gorges Reservoir region are studied through field investigation, sampling and laboratory tests. The influences of stone contents on the relationship between shear stress and displacement and soil strength parameters are analyzed by using the large-scale direct shear tests. Mechanical properties and deformation of accumulation bodies are controlled by the stone contents. With change of the stone content, the relation curves of shear stress and displacement are classified into three types: exponential curve, hyperbolic form and strain softening. The cohesion of accumulation body increases with the increment of the stone content in the form of quadratic polynomial curve, and generally it reaches the peak value when the stone content is about 60%, then it decreases as the stone content increases. The internal friction angle increases with the increment of the stone content in the form of exponential curve.关键词
土石混合介质堆积体/含石量/室内大型直剪试验/剪应力-位移关系曲线/抗剪强度Key words
soil-rock accumulation body/stone content/lab large-scale direct shear test/shear stress- displacement relation/shear strength分类
建筑与水利引用本文复制引用
杨继红,董金玉,黄志全,郑珠光,齐丹..不同含石量条件下堆积体抗剪强度特性的大型直剪试验研究[J].岩土工程学报,2016,38(z2):161-166,6.基金项目
国家自然科学基金青年基金项目（41102203）；河南省高等学校青年骨干教师资助计划项目（2014GGJS-067）；水利部公益性行业科研专项经费项目（201301034）；华北水利水电大学2014年“青年科技创新人才支持计划”项目 （）
