摘要
以梯度项塑性理论为基础,对锦屏一级左岸典型深卸荷带地质特征进行了分析。该理论认为岩体内部局部卸荷软化参数不在其局部范围内确定,而是由积分点及其邻域所在影响范围来确定,且在应力应变关系中引入带塑性应变的梯度项。锦屏一级左岸地区二维和三维分析结果均显示了深部屈服现象,其与现场勘探出现的深部卸荷带裂缝位置具有空间分布上的一致性。数值计算中的梯度项塑性屈服,特别是在具备一定高地应力围压的条件下,即是岩体卸荷破裂,直至应力局部释放,最终趋于形成相对稳定的局部卸荷带。其计算结果较为可靠,分析结果与该地区出现的深部卸荷裂缝特征基本相符。
Based on the Gradient-Plasticity algorithm, geologic feature of deep unloading for left bank of the Jinping I Project is presented. The Gradient-Plasticity algorithm is a new unlocalization method. Local soften unloading of rock body is not defined in local zone, but determined in integral dot and whole region of influence. The gradient term of plastic strain is introduced into the relation of stress and strain. The results of two-dimensional and three-dimensional computation for left bank of the Jinping I Project is both disclosed the consistency of deep plasticity in space distribution of unloading position. The Gradi- ent-Plasticity yielding is presented on unloading broken of rock body in the condition of high ground stress confining pressure. At last, the local unloading belt tends to relative stable after local stress releasing. Computational results agree with the characteristics of deep unloading cracks in the Project district.
出处
《水利学报》
EI
CSCD
北大核心
2011年第12期1432-1437,共6页
Journal of Hydraulic Engineering
基金
二滩水电开发有限责任公司合同资助项目(EHDCA-201007)
关键词
深部卸荷
高地应力场
梯度塑性算法
锦屏一级
Deep unloading
High ground stress field
Gradient-Plasticity algorithm
Jinping I
