基于原位旁压试验的切线模量法及其初步验证

发布时间：2018-01-26 21:28

本文关键词： 地基沉降切线模量法原位旁压试验砂土地基　出处：《岩土工程学报》2017年S1期 　论文类型：期刊论文

【摘要】：切线模量法根据原位压板载荷试验求取不同荷载水平下土体的切线模量,并将其应用于分层总和法进行地基沉降计算,较好地克服了通常取样扰动的不利影响,并能够反映地基沉降的非线性,是目前地基沉降计算中较实用有效的方法之一。而其不足之处则是原位压板试验工作量大、时间长,且难以反映深部土体的特性;相比而言,旁压试验设备轻便、测试时间短,且可在不同深度的土层进行测试,可以算是一种简单实用的原位试验。因此,为了进一步发展和完善切线模量法,本文探讨了利用原位旁压试验获取切线模量法计算参数的方法,并通过位于美国Texas AM University河滨校区的粉细砂地基上4个不同压板尺寸载荷试验结果,检验了其可行性。结果表明:4个不同压板尺寸载荷试验的沉降计算结果与试验结果具有较好的一致性,初步验证了基于原位旁压试验的切线模量法的可行性。
[Abstract]:The tangent modulus method is used to calculate the tangent modulus of soil under different load levels according to the in-situ compression plate load test, and it is applied to the calculation of foundation settlement by the method of stratified summation, which overcomes the adverse effect of the usual sampling disturbance. And can reflect the nonlinearity of foundation settlement, is one of the more practical and effective method in foundation settlement calculation at present, but its shortcoming is that the in-situ pressure plate test work is large, the time is long. And it is difficult to reflect the characteristics of deep soil. In contrast, the bypass test equipment is portable, the test time is short, and can be tested in different depth of soil, it can be regarded as a simple and practical in-situ test. Therefore, in order to further develop and improve the tangent modulus method. In this paper, the method of calculating the parameters of tangent modulus method by in-situ pressure-pressure-test is discussed. The load test results of four different sizes of pressed plates on silty sand foundation located in the riverside campus of Texas AM University in the United States are also given. The results show that the settlement calculation results of four different compression plate size load tests are in good agreement with the experimental results, and the feasibility of tangent modulus method based on in-situ pressure test is preliminarily verified.
【作者单位】：中山大学地球科学与工程学院;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;华南理工大学土木与交通学院;
【基金】：国家自然科学基金项目(51378131,41572277) 广东省自然科学基金项目(2015A030313118) 广东省岩土工程技术研究中心开放基金项目(201404002)
【分类号】：TU433
【正文快照】： 地基沉降计算是经典土力学研究中的一个基本而又未能很好解决的问题,常用的地基沉降计算方法多是由现场取样经室内土样压缩试验,将所得的参数用于沉降计算。这种方法虽然比较简单实用,但仍存在*通讯作者(E-mail:eestls@mail.sysu.edu.cn)两个不足:(1)取土时会产生扰动,(2)试验

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