考虑原位结构效应确定深厚覆盖层土体的动强度参数
发布时间：2018-08-17 18:34
【摘要】：深厚覆盖层土体原位结构性强,原状样取样困难,且由于粒径、级配的改变,室内重塑样试验确定的力学参数不能反映原位土体的实际性质,如何考虑原位结构效应确定深厚覆盖层土体的力学参数是工程建设中的难题。本文探索了联合现场原位试验和室内重塑样动力特性试验,考虑原位结构效应确定深厚覆盖层土体动强度参数的方法:(1)基于现场试验确定原位土体的动强度基准值;(2)基于室内重塑样试验确定动强度在不同振动强度和固结应力条件下的变化规律;(3)结合室内动力试验确定的动强度参数变化规律,将基于现场试验确定的动强度基准值推延至多种震级和应力条件。以某实际深厚覆盖层深埋砂土为研究对象,联合现场标贯试验和室内动三轴试验结果,综合确定了能考虑深厚覆盖层土体原位结构效应的砂土动强度参数,并与室内试验结果进行了对比。研究成果可为该工程坝体—覆盖层地基系统抗震安全评价提供依据,也可供类似工程参考。
[Abstract]:The in-situ structure of deep overburden soil is strong, and it is difficult to sample in-situ. Because of the change of particle size and gradation, the mechanical parameters determined by indoor remodeling test can not reflect the actual properties of in-situ soil. How to determine the mechanical parameters of deep overburden soil considering in-situ structure effect is a difficult problem in engineering construction. In-situ test and in-situ test of dynamic characteristics of remolded samples, considering in-situ structural effects to determine the dynamic strength parameters of deep overburden soil: (1) based on in-situ test to determine the dynamic strength of in-situ soil reference value; (2) based on in-situ remolded sample test to determine the dynamic strength under different vibration strength and consolidation stress conditions; (2) based on in-situ test to determine the dynamic strength of remolded samples under different conditions of consolidation 3) Based on the dynamic strength parameters determined by indoor dynamic tests, the dynamic strength datum values determined by field tests are extended to various magnitudes and stress conditions. The dynamic strength parameters of sandy soil due to in-situ structural effect of soil mass are compared with the laboratory test results. The research results can provide a basis for seismic safety evaluation of the dam-overburden foundation system of the project and a reference for similar projects.
【作者单位】： 流域水循环模拟与调控国家重点实验室中国水利水电科学研究院;水利部水工程抗震与应急支持工程技术研究中心;
【基金】：国家自然科学基金项目(51679264,51209234,51509272) 国家重点基础研究发展计划暨973计划课题(2013CB036404) 国家科技支撑计划课题(2013BAB06B02) 水利部公益性行业科研专项经费项目(201501035) 中国水科院科研专项(GE0145C092016)
【分类号】：TU413
本文编号：2188527
[Abstract]:The in-situ structure of deep overburden soil is strong, and it is difficult to sample in-situ. Because of the change of particle size and gradation, the mechanical parameters determined by indoor remodeling test can not reflect the actual properties of in-situ soil. How to determine the mechanical parameters of deep overburden soil considering in-situ structure effect is a difficult problem in engineering construction. In-situ test and in-situ test of dynamic characteristics of remolded samples, considering in-situ structural effects to determine the dynamic strength parameters of deep overburden soil: (1) based on in-situ test to determine the dynamic strength of in-situ soil reference value; (2) based on in-situ remolded sample test to determine the dynamic strength under different vibration strength and consolidation stress conditions; (2) based on in-situ test to determine the dynamic strength of remolded samples under different conditions of consolidation 3) Based on the dynamic strength parameters determined by indoor dynamic tests, the dynamic strength datum values determined by field tests are extended to various magnitudes and stress conditions. The dynamic strength parameters of sandy soil due to in-situ structural effect of soil mass are compared with the laboratory test results. The research results can provide a basis for seismic safety evaluation of the dam-overburden foundation system of the project and a reference for similar projects.
【作者单位】： 流域水循环模拟与调控国家重点实验室中国水利水电科学研究院;水利部水工程抗震与应急支持工程技术研究中心;
【基金】：国家自然科学基金项目(51679264,51209234,51509272) 国家重点基础研究发展计划暨973计划课题(2013CB036404) 国家科技支撑计划课题(2013BAB06B02) 水利部公益性行业科研专项经费项目(201501035) 中国水科院科研专项(GE0145C092016)
【分类号】：TU413
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