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本文以珠海市横琴新区环岛北片主干路及滨海次干路市政道路工程为背景,选取淤泥层分布具有代表性的路段G#路中G1、G2及G3段作为试验段,对横琴新区采用真空联合堆载预压法处理地基对软土力学特性的改良进行了试验研究,着重对该地区淤泥层排水固结参量β值的选取进行了分析,详细介绍了β值的四种计算方法 (公式计算法、三点法、孔压监测资料反算法及沉降差拟合法)及过程,并将计算的β值应用在沉降速率法中,对预测的沉降曲线与实际监测曲线进行了对比验证,发现三点法计算的β值预测的沉降曲线不稳定,具有偶然性;孔压监测资料反算的β值预测的沉降曲线中规中矩,具有离散性;公式计算法计算的β值预测的沉降曲线中规中矩,参数选取的试验手段和方法有一定局限性;沉降差法拟合的β值预测的沉降曲线与实际监测曲线具有很好的吻合性,满载后与实际监测曲线吻合程度大于前几级加载时期,且稳定可靠,能反映和代表该地区淤泥层的实际固结特性。研究成果可为后期横琴新区大开发提供经验,对排水固结最终沉降预测及其它地区固结参量β值的选取具有一定的借鉴意义。
Taking Zhuhai Hengqin New District Central Island North Road trunk road and Binhai Szechuan Submarine Road municipal road project as the background, G1, G2 and G3 sections of G # Road with typical silt distribution are chosen as experimental sections, and Hengqin New Area Vacuum combined with surcharge preloading method to treat the improvement of soft soil mechanical properties of the experimental study focused on the selection of drainage consolidation parameters β of the sludge layer in the region were analyzed in detail the four methods of calculating β values Formula calculation method, three-point method, pore pressure monitoring data inversion method and settlement difference fitting method) and the process, and the calculated β value in the settlement rate method, the predicted settlement curve and the actual monitoring curve were compared and verified, It is found that the settlement curve predicted by the three-point method is unstable, and the settlement curve predicted by the β-value of the pore-pressure monitoring data is quite normal and discrete. The settlement curve predicted by the β- The test methods and methods for parameter selection have some limitations. The settlement curve predicted by the settlement difference method fitted well with the actual monitoring curve, Monitor the degree of fit curve is greater than the previous level load times, and stable and reliable, able to reflect and represent the actual consolidation characteristics of the silt layer in the region. The research results can provide experiences for the later development of Hengqin New Area, which will be of reference for the prediction of ultimate settlement of drainage consolidation and the selection of β values of consolidation parameters in other areas.