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当工程项目设计需要确定基岩界面而第四系厚度又较大时,基岩界面判断的准确性将给工程的基础施工带来很大影响。本文通过二个工程实例分析基岩界面判断错误的主要原因及勘察中防止误判的几点建议。 在镇江市工程建设中高层建筑及重要的工程项目采用桩基础类型的比较多。勘察报告提供的基岩面埋藏特征为设计提供了桩基持力层的位置。所以,基岩界面划分是否正确直接影响桩基施工,无论是基岩面被误判抬高还是降低,对桩基施工的工期、预决算及建筑工程的质量等均有很大的影响。查明基岩面及其埋藏特征,这本是承接勘察任务的勘察单位应该做到的,而且也是不难做到的,然而在少数桩基施工过程中常发现基岩面有较大出入。下面以二个工程实例谈谈岩层界面判别差错产生的主要原因及防止误判的几点建议。
When the project design needs to determine the bedrock interface and the thickness of the Quaternary system is large, the accuracy of the judgment of the bedrock interface will have a great impact on the foundation construction of the project. This paper analyzes the main reasons for the error of the bedrock interface through two engineering examples and suggests several suggestions for preventing misjudgments in the survey. There are many types of pile foundations used in high-rise buildings and important projects in Zhenjiang City. The bedrock surface burial feature provided by the survey report provides the location of the pile foundation bearing layer for the design. Therefore, whether or not the bedrock interface is correctly divided directly affects the construction of the pile foundation. Whether the bedrock surface is misjudged to be raised or lowered, it has a great influence on the construction period, the final accounts and the quality of the construction work of the pile foundation construction. Identifying the bedrock surface and its burial characteristics, this is a surveying unit that undertakes survey tasks should be done, and it is not difficult to do it. However, in the construction process of a few pile foundations, it is often found that the bedrock surface has a larger gap. The following two examples of engineering to talk about the main reasons for the formation of discriminant errors in the rock formation and to prevent misjudgment recommendations.