基于旋转触探技术的基础沉降计算方法研究

Research on the Calculation Method of Foundation Settlement Based on Rotary Penetration Testing Technology

研究目的:旋转触探具有勘探深度大,测试数据连续、重复性好,测试快捷、经济等优点,是一种具有广阔工程应用前景的新型原位测试方法。为拓展旋转触探技术的应用领域和范围,本文提出一种基于旋转触探技术的基础沉降计算方法,建立相应的基础沉降计算经验公式,并通过工程实例验证该方法的可靠性。研究结论:(1)提出了基于旋转触探技术的基础沉降变形计算方法,建立了相应的基础沉降变形计算经验公式s=ψλΔpΣni=1[I_iΔz_i/(a_ie_(ri)^(—ci)+b_i)],经工程实例验证,计算效果良好;(2)所建立的基于旋转触探技术的基础沉降变形计算方法,概念明确、计算简单、精度高,计算过程所需参数通过旋转触探原位测试即可获取,无需钻探、取样及室内固结试验,可避免取原状样困难和试验结果离散性大等问题,能大幅降低勘探测试成本和试验周期;(3)所建立的基于旋转触探技术的基础沉降变形计算方法尚无法计算基础加固区沉降量,该部分沉降量的计算可采用复合地基加固区复合土层压缩变形量计算相应公式;(4)该研究成果可为基础沉降变形提供一种简便、快捷的新计算方法,可促进旋转触探技术的应用推广。

Research purposes： Rotary penetration test is a new in - situ testing method that has broad application prospect. It has high efficiency in exploration depth, continuous repeatability, rapid test, economic benefit and other advantages. In this paper, in order to expand the application field and scope of rotary penetration testing technology, a foundation settlement calculation method was proposed based on the rotary penetration testing technology. The empirical calculation formula of foundation settlement was established and verified by engineering examples. Research conclusions： （ 1 ） A new calculation method of foundation settlement was proposed based on rotary penetration n test, and the corresponding empirical calculation formula s = bAAp I liAzi/（ ai ＋ bi ） was established. （2） All i=l required parameters to calculate the foundation settlement could be obtained by in - situ test of rotary penetration without drilling, sampling and consolidation test. This method could avoid the inconvenience of undisturbed sampling and discrete results of consolidation tests, and reduce the period and cost of engineering exploration. （3）The method could not calculate the settlement of the foundation reinforcement area, which could be calculated by using the formula of the compression deformation calculation of reinforcement zone for composite foundation. （4） The results can provide a simplenew calculation method for foundation settlement and promote engineering applications of the rotary penetration technology.