载荷试验尺寸效应及地基承载力确定方法探讨

发布时间：2018-02-13 22:53

本文关键词： 载荷试验尺寸效应承载力切线模量法　出处：《岩土力学》2016年S2期 　论文类型：期刊论文

【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。
[Abstract]:Compression plate load test is the most reliable method for determining the bearing capacity of foundation, which is widely used at present. However, there are many influencing factors such as plate size, buried depth, uniformity of foundation and soil, settlement stability standard and so on. The engineering practice shows that the error between the measured settlement and the calculated settlement based on the eigenvalue of the bearing capacity of the foundation determined by the compression plate test is large, and based on the existing research results, the influence of the size of the compression plate on the test results is the greatest. Research on dimensional effect of load Test and determination method of bearing capacity of Foundation (1) A review of the existing problems in the determination of bearing capacity of foundation at present A) Analysis of the size effect of load Test 3) based on the nonlinear tangent modulus method proposed by Professor Yang Guanghua, How to obtain the load-settlement curve of the actual foundation by using the load test results of the small plate is deduced and given. The method of determining the bearing capacity of the foundation by using the p-s curve of the actual foundation is given. Since the pressure plate test can only reflect shallow soil, the method of determining the bearing capacity of the deep soil by using the pressure-pressure test is presented. The concrete engineering example shows that the foundation bearing capacity of the deep soil is determined by the method of double control of foundation safety and settlement. Based on the settlement value calculated by using the parameters obtained by small pressure plate, the method of geotechnical parameters can not only improve the accuracy of settlement calculation, but also improve the accuracy of settlement calculation. It can also promote the development of basic design theory and the improvement of design level.
【作者单位】：广东省水利水电科学研究院;广东省岩土工程技术研究中心;广东省山洪灾害突发事件应急技术研究中心;华南农业大学水利与土木工程学院;深圳市基础工程有限公司;
【基金】：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)~~
【分类号】：TU470

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