承压水降水引起地面沉降的实用预估方法研究

以地下水渗流理论和太沙基固结理论为基础,本文探讨了一种新的与现场测试相结合的两步沉降预估法,介绍了该法预测地表沉降的具体思路,并且推导了相应的计算公式。通过现场抽水试验获取计算参数和地表沉降分布规律,利用多井试验反演所得的降深与地表沉降关系,运用数值模拟手段对场地内的地表沉降进行预测。实例预测结果表明,该法能较好的预测承压水降水引起的地面沉降,是一种预测基坑降水引起周围地面沉降的有效方法。

Study on Practical Prediction Method of Surface Settlement Caused by Dewatering of Confined Water

Based on the theory of seepage of groundwater and Terzzaghi＇s consolidation, this paper discussed a new prediction method combined with in-situ test. The paper introduced the concrete ideas of the new method, and corresponding calculation formulas were deduced too. The related parameters and the distribution laws of ground settlement can be derived from the in-sire pumping tests on wells, based on the relationship between drawdown and surface subsidence derived from the back analysis of the in-s/re pumping tests, numerical simulation methods were used to predict the surface subsidence in the field. The results of engineering example showed that the method could better predict the surface settlement caused by dewatering of confined water, which is an effective method to predict the surface settlement.