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延安新区建设是目前世界范围内在湿陷性黄土地区“平山、填沟、造地、建城”中规模大、难点多、情况复杂的岩土工程之一。这种“深挖高填”场地,在无前人研究成果的条件下,如何科学合理地确定地基承载力特征值,尤其是如何更加充分地利用好挖方区场地良好的工程地质条件,是勘察、设计单位及建设单位所面临的重要问题。本文通过分析延安新区场地的划分,搜集了延安新区挖方区场地大量的天然地基静载荷试验和天然地基浸水静载荷试验结果,基本确定了深挖方区场地Q_2黄土的地基承载力特征值,结果科学可靠,为新区建设提供了设计依据,具有一定的经济和社会意义。
The construction of Yan’an New Area is one of the geotechnical projects with large scale, many difficulties and complicated conditions in the collapsible loess area in the world. How to scientifically and reasonably determine the bearing capacity of foundation under the condition of no previous research results, especially how to make good use of the good engineering geological conditions in the site of excavation area, It is an important issue for prospecting, designing units and construction units. Based on the analysis of the site of Yan’an New Area, this paper collected a large number of natural foundation static load tests and natural foundation immersion static load test results in Yan’an New Area, and basically determined the eigenvalues of foundation bearing capacity of Q_2 loess in deep excavation area. Results Scientific and reliable, providing the design basis for the construction of the new district and having certain economic and social significance.