论文部分内容阅读
新疆某平原水库坝基分布的砂层透镜体,其物理力学参数是否满足坝基土层的设计要求,对工程建设方案设计和施工处理措施具有重要的影响。通过室内物理力学性质试验和原位标准贯入试验,研究了该坝基的砂层透镜体的物理力学性质。研究发现,该砂层透镜体为粉砂,颗粒级配良好,结构密实,属于低压缩性土;抗剪强度和地基承载力满足设计要求,但渗透系数偏大,为中等透水性砂土,远大于设计渗透系数的要求;该层为水库渗漏的主要通道,水库的防渗墙必须截断该透镜体,确保坝基和坝体的防渗符合设计要求,才能有效地解决水库的防渗问题。研究成果为坝基稳定性设计提供充分和确切的试验数据和工程参考依据。
Whether the physical and mechanical parameters of the sand lens in a reservoir of a plain reservoirs in Xinjiang meets the design requirements of the dam foundation soil plays an important role in the design and construction of the project. The physical and mechanical properties of the sand lens of the dam foundation are studied through the laboratory physical-mechanical property test and the in-situ standard penetration test. It is found that the sand lens body is silt, the particle size distribution is good and the structure is compact, which belongs to the low compressibility soil. The shear strength and the foundation bearing capacity meet the design requirements, but the permeability coefficient is too large, which is medium permeability sand, Which is much larger than the design permeability coefficient. This layer is the main channel of reservoir leakage. The impervious wall of the reservoir must be cut off to ensure that the seepage prevention of the dam foundation and the dam meet the design requirements, so as to effectively solve the seepage prevention problem of the reservoir . The research results provide sufficient and exact experimental data and engineering reference for the design of dam foundation stability.