【作者】 赖思静； 杨伟； 李海平；

【Author】 LAI Si-jing, YANG Wei, LI Hai-ping (Chongqing Communication Research and Design Institute, Chongqing 400067, China)

【机构】 重庆交通科研设计院；

【摘要】 面波技术在工程勘察及岩土工程检测中得到了较为广泛的应用。现有的理论研究主要针对面波频散曲线的计算、正反演分析。工程中多以岩土工程勘察、路基压实质量检测以及地基承载力等测试方面应用较多。通过对大量野外面波测试信号的分析发现时域信号与测试区域地质具有很大的相关性。面波信号遇到孤石或空洞时,时域信号会发生明显的反射或散射。地表为高刚度地层覆盖时,面波时域信号中会有明显的高阶模态成分。若地表为软弱层时,面波时域信号表现为振型较多,且伴有高阶振型。测线范围内地表存在软硬分区时,面波时域信号的同相轴存在明显的转折,可以根据转折点确定软硬分区位置,并判断软硬区域。现场信号数据采集时,干扰信号常常存在,可以根据时域信号特征判定干扰信号类型(固定干扰信号或随机干扰信号),并采取相应措施加以解决, 以期获得高质量的信号数据。针对上述情况下的时域信号,结合测区地质条件,对时域信号进行工程地质解释, 从而得出几种典型时域信号反映的地质特征,为工程技术人员现场快速判定提供帮助。更多还原

【Abstract】 Surface wave technique is applied extensively in engineering geological exploration and engineering testing. Existing theoretic studies have been focused on computation and forward and backward analysis, while engineering applications have been focused on geological exploration, roadbed compaction degree and groundwork bearing force testing. It is found that strong relativity exists between surface wave time domain signal and testing section’s geological condition by means of studying on characteristic analysis of surface wave time signal. In media of isolated stone and hole, surface wave time domain signals occur distinct reflection and scatter. In the earth’s surface with high stiffness, surface wave time domain signals exist higher mode component. In the earth’s surface with weak layer, surface wave time domain signals behave lots of vibration mode component, and exist higher mode. When the earth’s surface exists soft and stiff area, axis of in-phase of surface wave time domain signals has obvious transition, which makes location of soft and stiff area certain. Disturbing signals often exist in data collection, it determines type of disturbing signals(fixuping disturbing signals and random disturbing signals), and eliminates their impact. It explains the surface wave time domain signals at the aspect of engineering geology by means of testing section’s geological condition, and draws some conclusions on geological characteristic reflected by several typical surface wave time domain signals, which helps engineers for quickly judgement in field.更多还原