基于软硬相间滑床岩体结构劣化的抗滑桩嵌固机理研究

项目名称： 基于软硬相间滑床岩体结构劣化的抗滑桩嵌固机理研究

项目编号： No.41472261

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 地质学

项目作者： 李长冬

作者单位： 中国地质大学（武汉）

项目金额： 90万元

中文摘要： 抗滑桩嵌固机理研究一直是滑坡防治领域重要前沿和难点课题，在滑坡频发的软硬相间地层中尤显突出,亟需开展软硬相间地层中抗滑桩嵌固机理研究。滑床中层面和节理面切割会导致岩体完整性降低，岩体结构劣化将会导致其变形和强度参数劣化；开展滑床岩体离散元数值试验，研制便携式承压板仪进行现场测试，揭示软硬相间滑床变形和强度参数劣化机理及其量化表征；采用自行研制的物理模型试验装置开展不同优势结构面组合、嵌固深度、软硬层厚度和滑床倾角条件下抗滑桩物理模型和数值模拟平行对比试验，揭示软硬相间滑床中抗滑桩嵌固机理，建立考虑岩体参数劣化的抗滑桩嵌固深度数学模型；结合岩体流变试验，研究基于滑床岩体变形与强度参数劣化和岩体流变的抗滑桩嵌固机理机理，依托三峡库区地质灾害野外大型试验场滑坡－抗滑桩原型试验进行对比验证，提出基于滑床岩体参数劣化和岩体流变的抗滑桩嵌固深度确定方法，为广大软硬相间地层分布区抗滑桩工程提供理论依据。

中文关键词： 滑坡；软硬相间滑床；抗滑桩；嵌固机理；嵌固深度

英文摘要： The embedded mechanism of anti-slide pile embedded depth is always considered as one of the frontier subjects and difficult problems in the field of landslide protection. As a result, it is necessary to conduct the embedded mechanism study on anti-slide piles in alternating hard and soft layered strata. Due to the dividing effect caused by the bedding planes and joints in the wide range of sedimentary rock, the distinct rock structure will induce the deterioration of deformation and strength parameters. The planned portable lateral bearing plate and three-dimentional dinstinct numerical modeling tests are utilized to reveal the mechanism of rock deformation and strength caused by deterioration and their quantization characterization of hard and weak alternated bedrock. On the basis of the developed physical modeling experimental device for embedded mechanism, the physical and numerical modeling parallel tests with different preferred structural planes, embedded depth, unit layer thickness and dip angle can be conducted. Though the tests results, the mechanical of anti-slide piles can be revealed, and the corresponding mathematical and mechanical computational model of anti-slide embedded depth considering the deformation of parameters can be created. Rock rheological tests could be carried out by surcharge loads, from which the embedded mechanism and long-term safety of anti-slide pile based on deterioration of rock deformation and strength can be studied. The results presented above would be validated by the field tests in Zigui County by Three Gorges Research Center for geo-hazard, Ministry of Education. Furthermore, the determination of anti-slide pile embedded depth based on deterioration of rock deformation and strength and rock rheology can be put forward. The theory and test results from this study can provide significant scientific theory basis for the anti-slide piles projects in alternating hard and soft layered strata.

英文关键词： landslide;hard and weak alternated bedrock;anti-slide pile;embedded mechanism;embedded depth