摘要
为了对在河床覆盖层上进行筑坝的可行性进行研究,松塔水电站采用室内试验与多种原位测试相结合的方法对深厚覆盖层工程力学特性进行研究,覆盖层具有层厚、层多、成因复杂等特点,在河床钻孔钻探过程中出现涌沙、卵砾石层塌孔等情况,试验取样受到不同程度的扰动,原位测试也受到一定的限制,试验结果不能很好地反映河床覆盖层的工程力学特性。为了更深入的对河床覆盖层力学特性进行研究引入了旁压试验,其作为一种原位测试方法,能够反映土体的原位应力状态,在同一土层中进行试验结果离散性小;也能较好的适应试验土层,可以在同一钻孔内不同土层间连续试验,适应地下水环境、试验深度大、操作简单、结果可靠性高,在松塔水电站深厚覆盖层工程力学特性研究中发挥了很好的作用。
In order to study the feasibility of damming at the riverbed, the combination of indoor test and in-situ test are used to study the engineering mechanical properties of overburden riverbed at Songta hy-dropower station, and the riverbed layers have thickness, multi-layer, complex causes characteristics, in drilling process the sands gush and gravel stratum collapse, samples are subjected to different degrees of disturbance, in-situ tests are also subjected to certain restrictions, the test results can not well reflect the engineering mechanical properties of deep overburden riverbed. For more in-depth studying of mechanical properties of the riverbed introduces the pressuremeter test, as an in-situ testing method, it can reflect the soil in-situ stress state, test results in same soil separate small; It can also better adapt the test soil, con-tinue test in same hole of different layers, adapt to the groundwater environment, depth test, test opera-tion is simple, high reliability, it plays a good effect in studying engineering mechanical properties of the deep overburden riverbed at Songta hydropower station.
出处
《勘察科学技术》
2014年第1期31-34,52,共5页
Site Investigation Science and Technology
