不同含水层岩性沉降经验修正系数的研究

Study on Correction Coefficient of Lithology Settlement in Different Aquifer

为了较为准确地计算降水施工引起的地面沉降值,本文选取大量地铁降水施工中沉降监测数据,并利用最小二乘法对数据进行处理分析。针对不同岩性事先给定经验系数,然后,将此经验系数计算出数据值与处理后沉降实际监测数据进行对比分析,并进行误差统计分析,如果符合最大概率法分布规律,那么此经验系数符合实际情况,可用;如果不符合最大概率法分布规律,那么此经验系数不符合实际情况,不可用,返回上一步,重新给定经验系数。最终,计算出不同岩性对应的修正系数取值范围,对北京地区降水影响范围内的各类地层,提出一个较为适当的修正系数。研究成果将为工程技术人员对降水引起的地面沉降,进行预测提供参考依据。

In order to accurately calculate the settlement values caused by dewatering, the paper selected a large number of subway construction in settlement dewatering monitoring data, and used the error analyzing method for data processing and analysis. Then, the empirical data value and the settlement monitoring data are analyzed, and the error analysis is conducted. If the maximum probability distribution law is used, the empirical coefficient can be used to meet the actual situation. If it doesn＇t comply with the maximum probability distribution law, the empirical coefficient will not meet the actual situation. Finally, we propose an appropriate correction factor of various stratum affected by dewatering in the area of Beijing, by means of calculating the corresponding value range of correction factor of different lithology. Research results will provide a reference for engineering and technical personnel to forecast the ground subsidence caused by dewatering.