中文摘要：

大型堆积体常见于西南水电工程中，其力学性质极其复杂，需从细观结构上对其加以研究，才能从本质上揭示其力学特性及变形破坏的特征和规律。将数字图像处理技术（DIPT）应用到堆积体的数值模拟中，自行开发了Photo-To-FLAC3D（PTF）自动建模程序，可实现对堆积体图像的分析处理、信息获取并自动生成细观模型文件的全过程，为堆积体力学行为的模拟提供了新的建模方法。以澜沧江古水水电站堆积体边坡为例，对实拍数码照片采用PTF实现其细观模型快速、准确的建立，运用三轴数值模拟试验对其力学特性及力学参数进行分析和研究。研究表明，堆积体变形表现出明显的“欺软怕硬”特性，受力表现出“贯穿带”的特性。提出随机统计分析法对堆积体力学参数进行研究，通过随机选取多组现场照片进行分析，由统计分析得出的力学参数与实际工程物理实验的参数非常接近，说明该力学参数研究方法的可信性，为堆积体力学参数的选取提供了一条新的路径和依据，是大型原位试验的有益补充。

英文摘要：

Talus deposit is often seen in hydropower projects in the southwest of China. Its mechanical properties are so complex that the microstructural study is often used to reveal the essence of its deformation and damage. The digital image processing technology （DIPT） is introduced to the simulation of talus deposits. Based on the study of DIPT, a Photo-To-FLAC3D （PTF） auto-modeling program is developed. It is able to realize the whole process： analyzing and processing the digital images, acquiring the information and establishing the micro-model files. A new modeling method is developed for the mechanical behaviors of talus deposits. As an example, some talus deposit data of Gushui Hydropower Station are used. A micro-model for the talus deposit is established fast and correctly by means of the PTF from the field digital photo. The mechanical properties and parameters are studied by the numerical simulation of triaxial tests. The results show that the talus deposit has the feature of＂bully＂ in deformation while that of＂Unicorn band＂ under force. A random statistical analysis method for the mechanical parameters is proposed by selecting field multiple photos. The mechanical parameters based on the statistical analysis method are very close to those of experiments in the actual engineering, indicating that the new method of acquiring mechanical parameters is credible. A new way is opened up for selecting the mechanical parameters of talus deposits, which provides a useful supplement for large-scale field tests.