覆盖层土体和筑坝堆石料力学参数室内外联合确定方法

Indoor and outdoor joint determination method for mechanical parameters of alluvial and rockfill materials

岩土体力学参数测试是岩土工程工作的基础性问题,也是影响工程设计的关键问题,因此本文基于室内和现场试验研究覆盖层土体和筑坝堆石料力学参数的室内外联合确定方法,针对粗、中、细各类土,构建了室内和现场试验相结合、材料试验与模型试验相结合,大、中、小不同尺度相结合,强度、变形、残余变形等多参数测试相结合的理念先进、设备齐全、功能完善的系统实验平台,开展了联合室内和现场试验确定土体静动力特性参数的系统研究,形成了涵盖覆盖层土体和坝体堆石料力学特性的室内外联合测试和判释方法,开辟了一条考虑覆盖层土体原位结构效应和考虑筑坝堆石料尺寸效应确定土体工程力学特性参数的可行途径,能够为覆盖层地基和坝体系统的静动力分析提供成套的系列参数,研究成果已应用于十余项国家重点建设工程的设计。

The measurement of mechanical parameters of rock and soil mass is the basic problem of geo-technical engineering work,and also the key problem affecting the engineering design.Therefore,the test of mechanical parameters of rock and soil is the basic problem of geotechnical engineering work,and also the key problem affecting the engineering design.In order to meet the needs of national major engineering construction,the discipline of earth-rockfill dam and foundation seismic disaster reduction of IWHR has been able to carry out dynamic tests from general vibration triaxial tests to complex stress consolidation and cyclic shear tests,and from material property tests to structural dynamic characteristic tests for coarse,me-dium and fine soil in laboratory and on-site,and to measure the small strain(below 10-6)to failure strain(10-3).A systematic experimental platform with advanced concept,complete equipment and perfect function is constructed,which combines indoor and field tests,material tests and model tests,large,medium and small scales,and strength,deformation,residual deformation parameter tests,and a feasible way to deter-mine the size of the soil mass by considering the in-situ structure effect of the rockfill material and the en-gineering effect is developed.The system research has formed the indoor and outdoor joint test and interpre-tation method covering the mechanical properties of alluvial and rockfill materials,which can provide a com-plete set of parameters for the dynamic analysis of overburden foundation and dam body system.The re-search results have been widely used in the design demonstration of national key projects.