缅甸某油库利用标贯锤击数确定桩基参数的方法探讨

Discussion on the Method of Determining Pile Foundation Parameters by SPT-N Value in One Oil Deposit of Burma

缅甸某油库工程位于仰光迪洛瓦经济开发区,场地勘察期间标准贯入试验(SPT)是主要选用的原位测试方法,虽然标准贯入锤击数(SPT-N值)可用于评价岩土物理力学参数,但其值修正方法国内外差异较大。参考我国工程勘察工作经验和相关表格的桩基参数取值方法,无法满足项目业主的要求。最终,本次勘察执行BSEN和ASTM标准,并结合国外普遍认可的岩土工程手册,以Terzaghi、Peck和Skempton等人提出的SPT-N值修正理论和经验为基础,通过Tomlinson、Broms、Skempton和Berezansev等学者提出的桩基参数计算公式,利用SPT-N值估算了较为可靠的桩基设计参数,经工程建设验证,比较符合实际情况。该方法不仅可用于指导该油库的二期建设,而且对于国际工程勘察工作具有借鉴意义。

An oil deposit project is located in Dilova Economic Development Zone of Rangoon, Burma. In the period of site investigation,the standard penetration test (SPT) is chosen as the main insitu test method. Although the blow count (SPT- N value) can be used to evaluate the parameters of geotechnical physical mechanics, its correction methods are very different between China and other countries. Owner’ s requirements cannot be met by using Chinese experiences and relevant value taking methods of pile foundation parameters. Finally,this investigation work shall be performed in accordance with BS EN and ASTM standards. Combining with geotechnical engineering manuals that universally recognized abroad, and based on SPT- N value correction theory and experience proposed by Terzaghi, Peck, Skemptonet al., reliable pile foundation parameters are evaluated by using the SPTN value and the calculation formula of pile foundation parameter proposed by Tomlinson, Broms, Skempton and Berezansev and other scholars. The proposed method is seen as practical after the verification of project construction. The method cannot only be used to guide the construction of Phase II of the oil deposit,but also has reference significance to international geotechnical investigation project.