基于分级加载工况的沉降曲线拟合法及工程运用  

Curve-fitting method for settlement based on staged loading condition and its engineering application

作　　者：应宏伟[1,2,3] 黄兆江 葛红斌 沈华伟 王奎华 龚晓南[1,3] Ying Hongwei;Huang Zhaojiang;Ge Hongbin;Shen Huawei;Wang Kuihua;Gong Xiaonan(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Key Laboratory of Ministry of Educational for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Engineering Research Center of Urban Underground Development of Zhejiang Province,Hangzhou 310058,China;Fujian Panport Airport Construction Co.,Ltd.,Xiamen 361101,China;Huadong Engineering Co.,Ltd.,Hangzhou 310000,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,杭州310058 [2]河海大学岩土力学与堤坝工程教育部重点实验室,南京210024 [3]浙江省城市地下空间开发工程技术研究中心,杭州310058 [4]福建兆翔机场建设有限公司,厦门361101 [5]中国电建集团华东勘测设计研究院有限公司,杭州310000

出　　处：《东南大学学报（自然科学版）》2021年第2期300-305,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51678523).

摘　　要：为评估分级堆载预压法处理下地基的沉降,提出了适用于分级大面积加载工况的沉降预测方法.基于指数曲线法,将传统的单级加载预测模型拓展为多级预测模型,结合某填海机场地基处理工程实例,通过对实测沉降的拟合、预测,分析了多级预测方法的实际应用效果.研究结果表明:在分级加载工况下,与单级方法相比,多级方法能较好地预测后期继续加载且尚无实测数据情况的地基沉降发展,对最终沉降的预测误差在5%以内,而对于这种情况单级方法无法预测;对现有荷载下已有实测数据的沉降预测,多级方法和单级方法预测结果差别不大且预测误差都在5%以内;多级方法能反映多级工况下完整的沉降发展过程,而单级方法仅能拟合、预测当前一级荷载下的沉降.多级方法对分级加载工况下的沉降预测具有明显优势.To evaluate the foundation settlement under the treatment of staged surcharge preloading method,a settlement prediction method suitable for staged large-scale loading was proposed.Based on an exponential curve method,the traditional single-stage loading prediction model was extended to a multi-stage prediction model.Combined with an engineering example of a reclamation airport foundation treatment,through fitting and predicting the measured settlement,the practical application effects of the multi-stage prediction method were analyzed.The results show that under the condition of step loading,compared with the single-stage method,the multi-stage method can better predict the development of the foundation settlement under the condition of continuous loading and no measured data at the later stage,and the prediction error for the final settlement is within 5%,while the single-stage method cannot predict those for this condition.For the settlement prediction under existing loading with measured data,the prediction results of the multi-stage method and the single-stage method have little difference and the prediction errors are both within 5%.The multi-stage method can reflect the whole process of the settlement development under multi-stage loading,while the single-stage method can only fit and predict the settlement under the current loading.The multi-stage method has obvious advantages in the settlement prediction under the condition of step loading.

关 键 词：堆载预压法 分级大面积加载 沉降预测 指数曲线法 多级预测模型 

分 类 号：TU43[建筑科学—岩土工程]