›› 2016, Vol. 37 ›› Issue (S2): 263-272.doi: 10.16285/j.rsm.2016.S2.032

• 基础理论与实验研究 • 上一篇    下一篇

载荷试验尺寸效应及地基承载力确定方法探讨

张玉成1, 2, 3,杨光华1, 2, 3,胡海英4,刘翔宇1, 2, 3,骆以道5,姜 燕1, 2, 3   

  1. 1.广东省水利水电科学研究院,广东 广州 510610;2.广东省岩土工程技术研究中心,广东 广州 510610; 3.广东省山洪灾害突发事件应急技术研究中心,广东 广州 510610;4.华南农业大学 水利与土木工程学院,广东 广州 510642; 5.深圳市基础工程有限公司,广东 深圳 518026
  • 收稿日期:2016-06-12 出版日期:2016-11-11 发布日期:2018-06-09
  • 作者简介:张玉成,男,1975年生,博士后,教授级高工,从事岩土工程方面的咨询、设计研究。
  • 基金资助:
    国家自然科学基金(No. 51378131);广东省水利科技创新基金(No. 2009-25);广东省公路管理局科技基金(No. 2012-09);省属科研机构改革创新基金(No. 2014B070706008)。

Discussion on size effect of plate loading test and determination of bearing capacity of subgrade

ZHANG Yu-cheng1, 2, 3, YANG Guang-hua1, 2, 3, HU Hai-ying4, LIU Xiangyu-yu1, 2, 3, LUO Yi-dao5, JIANG Yan1, 2, 3   

  1. 1. Guangdong Research Institute of Water Resources and Hydropower, Guangzhou, Guangdong 510610, China; 2. The Geotechnical Engineering Technology Center of Guangdong Province, Guangzhou, Guangdong 510610, China; 3. The Guangdong Emergency Technology Research Center of Mountain Torrents Disasters, Guangzhou, Guangdong 510610, China; 4. College of Water Conservancy and Civil Engineering South China Agricultural University, Guangzhou, Guangdong 510642, China; 5. Shenzhen City Foundation Engineering Co., Ltd., Shenzhen, Guangdong 518026, China
  • Received:2016-06-12 Online:2016-11-11 Published:2018-06-09
  • Supported by:
    This work was supported by the National Natural Science Fund(51378131), Water Conservancy Science and Technology Innovation Fund of Guangdong Province(2009-25), Science and technology fund of Guangdong Provincial Highway Administration Bureau(No. 2012-09), and Provincial Scientific Research Institutions Reform and Innovation Fund(2014B070706008).

摘要: 压板载荷试验是目前被普遍采用且认为是最可靠的地基承载力确定方法,但其影响因素多诸如压板尺寸、埋置深度、地基土均匀性、沉降稳定标准等,尤其以压板尺寸对试验结果的影响最大。工程实践表明,利用压板试验确定的地基承载力特征值设计的基础,实测沉降与计算沉降之间的误差较大,在已有研究成果基础上,研究载荷试验尺寸效应及地基承载力确定方法:(1)综述目前地基承载力确定方面存在问题;(2)分析载荷试验的尺寸效应;(3)基于杨光华教授提出的非线性切线模量法,推导并给出了如何利用小压板载荷试验结果得到实际基础的荷载-沉降曲线的方法;(4)给出利用实际基础的p-s曲线确定地基承载力的方法,实现地基安全和沉降双控的目的;(5)由于压板试验只能反映浅层土,文中利用旁压试验确定深层土的地基承载力的方法。具体工程实例结果表明,基于利用小压板获得的参数计算的沉降值更符合实际;研究通过小压板原位测试方法获取沉降计算的岩土体统参数方法,不仅能够提高沉降计算精度,还可促进基础设计理论的发展和设计水平的提高。

关键词: 载荷试验, 尺寸效应, 承载力, 切线模量法

Abstract: The plate loading test is considered as the most wide and reliable method for determing bearing capacity, However, it can be affected by many factors, for instance, the size and buried depth of the load plate, the homogeneity of the soil, the criterion of determining ending of settlement, among which the size of load plate is the most important one. Mass engineering projects show that relatively error can be found between monitoring and predicted settlement when the plate load test is applied for determining the bearing capacity of foundation. Due to the above-mentioned problem, the paper considers the size effect of plate load test and the method for determining bearing capacity based on previous studies by others. The contents include: (1) Summarizing the defects of currently used methods for bearing capacity determination. (2) Analyzing the size effect of load plate. (3) Deriving the method of obtaining the p-s curve for real foundation by plate load test with plate in small size, based on Professor Yang’s theory of nonlinear tangent-modules method. (4) Proposing the method for determining the bearing capacity based on the p-s curve of the real foundation, the method is able to guarantee the safety of foundation and predicting the settlement. (5) Due to the fact that the plate load test is normally used for soils in shallow depth, the paper proposes a method to determine the bearing capacity in deeper soils by pressuremeter test; A project results show that the settlement calculated based on the soil parameters derived from small-size load plate test is closer to monitoring data. The research on deriving soil geotechnical parameters through small-size plate load test not only improves the accuracy of settlement calculation, but also promotes the development of foundation design theory.

Key words: plate load test, size effect, bearing capacity, tangent-modules method

中图分类号: 

  • TU 473
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