【摘要】 地铁施工引起土体疏松、松散和空洞,进而影响地铁运营和地铁周边建筑物的安全。为探索地铁施工扰动区探测及注浆效果评价的有效手段,介绍了SSP技术的原理和特点,并结合SSP技术在北京地铁14号线甜水园中街区段的应用实例,说明了该技术在地铁施工引起的土体扰动探测及注浆效果评价中的应用效果。结果表明:注浆区在SSP的波速图像中表现为高速异常,扰动区表现为低速异常,根据SSP波速图像中高、低波速异常的分布可判定注浆区与地铁施工扰动区的位置与形态。该技术还具有抗干扰能力强、探测深度大和分辨率高等特点,是城市地铁施工与环境影响探测与评价的有效手段。更多还原

【Abstract】 Zones disturbed by Metro construction may affect the safety of Metro operation and surrounding buildings. In the paper,the principle and characteristics of SSP seismic scattering technology are presented,so as to find an effective method to explore the zones disturbed by Metro construction and to estimate the effect of grouting reinforcement. The application of SSP technology in Tianshuiyuan Middle Street Section of Line 14 of Beijing Metro is illustrated,which verifies the effectiveness of SSP technology in the exploration of zones disturbed by Metro construction and in the estimation of the effect of grouting reinforcement. Conclusions drawn are as follows: 1) The grouting zones in the SSP image take the form of high velocity anomalies,while the disturbed zones in the SSP image take the form of low velocity anomalies; 2) The locations and patterns of the disturbed zones and grouting reinforcement zones can be determined on basis of the distribution of the high velocity anomalies and low velocity anomalies in the SSP image; 3) SSP technology,which has such advantages as strong interference resistance,deep exploration depth and high resolution,is suitable for exploring disturbed zones and estimating grouting reinforcing effect.更多还原