The seepage safety and sliding stability of a clay-core rockfill dam in Africa were examined through a combination of in-situ testing and numerical simulations under various working conditions. The findings indicate that, compared to conventional geological surveys and laboratory test data, in-situ parameters obtained from field direct shear and permeability tests provide greater accuracy and reliability. A numerical model based on the in-situ permeability coefficient was established, demonstrating its capability to reflect the seepage behavior of the dam and confirming that no seepage failure occurs under steady-state conditions. The calculated safety factors for sliding stability meet regulatory requirements across all conditions, and the introduction of a safety coefficient, S, allows for the quantification of the dam’s sliding stability margin. This study provides an analytical framework that integrates in-situ testing with multi-source data fusion, offering valuable insights for the safety assessment of similar projects.
In order to achieve Chinese goals of "carbon emission peaking in 2030 and carbon neutrality in 2060" and "building a new power system with new energy as the main body",there shall be a profound change in the development trend of energy industry and a further improvement in the penetration rate of new energy. The clean hydropower cluster in southwest China represented by the Jinsha river basin is an important base for clean power outgoing. The regulation and storage capacity of large-scale cascade hydropower may be utilized to bundle nearby wind and photovoltaic power stations for outgoing,thus realizing an overall multi-energy complementary power generation and providing stable and continuous clean power support for the receiving-end provinces. With a typical hydropower multi-energy complementary base in southwest China as the object,this study proposes an annual power transmission curve optimization method,which takes into account both electric abandoned rate of sending ends and the power load matching rate of receiving ends,and based on the sequence matching mode of peak load regulation for the receiving-end power grid,further puts forward a daily power transmission curve optimization method for DC outgoing. In this study,the optimization model is constructed based on the objective of minimizing the electric abandoned rate of clean energy in the region. The results have shown that a stable output of multi-energy complementary base can be realized by using the regulation capacity of large-scale hydropower. Through a reasonable optimization of wind-solar power ratio considering the demand for sending-end resources and peak load regulation for receiving ends,the consumption level of new energy and the utilization efficiency of the outgoing channels can be improved effectively.
The design of the existing top pipe pipeline structure adopts a plane strain model and assumes that the pipe circumference is a homogeneous foundation soil.By selecting typical geological conditions for internal force calculation and reinforcement of the pipeline structure, if the established rock and soil physical and mechanical parameters in the engineering design are different from the actual situation, that may cause engineering quality problems.Based on a largediameter pipe jacking project in a composite formation, the load structure method and the formation structure method were used to analyze the variation law of the internal force of the pipe joint under different geological conditions on the pipe sidewall.The results showed that the better the physical and mechanical parameters of the soil on the pipe side and the lower the groundwater level, the greater the calculated internal force of the pipes.When the top of the pipe is covered with backfill soil, the greater the formation loss rate, the greater the inner force of the jacking pipe structures.During construction, the formation loss rate should be strictly controlled to ensure the safety of the pipeline structure.
地形是影响架空输电线路工程造价的关键因素,开展线路沿线地形划分是工程建设前期重要工作之一.现行划分原则相对较为粗糙,应用中主观因素占比高,统计工作量大.为提升地形划分的准确性和效率,总结分析各项规范、设计指导文件中地形划分方法,结合工程实际,给出基于坡度和地势起伏因子的地形划分方法并提出量化方案.通过对西南区域某工程地形划分量化计算并与设计数据对比,建议在地形划分标准中对高山定义增加地势起伏因子,从而更好地指导工程建设.
我国海域地震频发,砂质沉积、混合沉积分布广泛,易发生地震液化,海上风电工程抗震勘察设计时需重点考虑对地震液化的准确评价.介绍国内外具有代表性的基于原位测试的液化判别方法,包括我国规范经验法和国外Seed简化法,并结合国内海上风电工程实例的应用,对各种方法的液化判别结果进行对比分析.研究结果认为对于国内具有类似工程地质和地震条件的海上风电工程,地震液化评价时宜优先采用基于SPT的规范经验法和基于CPTU的Seed简化法进行综合判别.
