Geological conditions analysis and schemes selection on Heilongjiang River crossing project of China-Russia Eastern Gas Pipeline

Pipeline project crossing Heilongjiang River is one of the most important parts of the China-Russia Eastern Gas Pipeline engineering. The selection of crossing schemes is influenced by many factors, such as geological conditions, environmental protection, construction cycle and cost. And it can provide accurate geological data and parameters for the crossing design and construction to investigate the geological conditions of the crossing area in detail. In the preliminary design stage, various investigation methods were used to survey the geological conditions of the crossing area, and the earthquake evaluation, flood control evaluation and other data were collected and then applied to expound the suitability of crossing site from the aspects of regional stability, hydrological conditions, and geotechnical characteristics of crossing layers. Then, several pipeline crossing schemes were compared and selected by analyzing the formation structure, lithologic characteristics, river bed stability and scour trend of crossing section. And finally, the considerations concerned with crossing design and construction were put forward and the rational suggestions on crossing design and construction were proposed.