原创《基坑开挖降水对坑外地表沉降影响》：此文是一篇基坑开挖降水论文范文,为你的毕业论文写作提供有价值的参考。
摘 要：考虑降水、支护结构变形以及基坑隆起3个因素引起的基坑周围土体的沉降,根据降水引起土体沉降的机理,运用修正的分层总和法单独计算出由降水引起的周围土体沉降.通过研究基坑开挖引起坑外土体沉降的规律,推导出由基坑开挖引起的坑外土体沉降理论公式.把降水引起的沉降及基坑开挖引起的沉降进行叠加,加入修正系数,最终以简化的理论公式合理地计算出基坑周围土体沉降.具体工程验证表明,推导的理论解析解和实测数据十分接近,能有效预估基坑周围土体沉降,为施工方案编制提供可靠的理论依据,最大限度减少基坑施工对周围环境的影响.
关键词：土体沉降；降水；支护结构变形；基坑底部隆起；解析解
中图分类号：TU46
文献标志码：A文章编号：1674-4764（2016）05-0043-06
Abstract：Settlement of soil around the foundation pit caused by dewatering, deformation of retaining structure and foundation pit uplift are considered to be the three factors causing ground surface settlement. Using layer-wise summation method to calculate the settlement of surrounding soils caused by dewatering according to the soil settlement mechanism of dewatering. By studying the law of the settlement of the soil caused by the foundation pit excavation, the theoretical formula for the settlement of the soil caused by the foundation pit excavation is deduced. Add up the subsidence caused by the foundation pit precipitation and the settlement caused by the excavation of foundation pit, and revise the results with Modified coefficient, eventually the settlement of soil around the foundation pit is reasonably calculated by the simplified theoretical formula. Through specific engineering verification shows that the derived theory analytical solution is very close to the measured data, the derived theory analytical solution can effectively predict the soil settlement around the foundation pit, thereby this will provides the reliable theory basis for the main body of the construction scheme, to reduce as much as possible the effect on the surrounding environment.
Keywords：soil settlement；dewatering；deformation of retaining structure；foundation pit uplift； analytic solution
中国资源正逐步集中于密集的城市地区,在繁华地带土体资源出现了紧缺的局面,使得基坑工程周围的施工工况更加复杂,因此,对基坑开挖引起的周围环境的影响的研究更加紧迫.土体开挖对周围环境的影响主要体现在基坑外土体的移动以及土体的不均匀沉降.Migliazza等[1]利用分析和经验公式,并通过建立三维有限元模型,分析隧道在不同开挖阶段及支护阶段由开挖引起的地表沉降.Gordon等[2]提出了一种预测支护墙体最大挠度及最大地表沉降的半经验模型,研究表明,该模型可以准确地预测在软黏土地区由于支护开挖引起的支护墙体最大挠度及地表沉降.Hsieh等[3]提出了2种沉降剖面模型,并通过实际案例对比验证,研究表明可以通过沉降剖面曲线预测沉降的近似值.李琳等[4]利用分层总和法求出由降水引起的地面沉降,同时在经验假设的基础上,利用剪切位移关系求出由于围护结构对地面沉降的约束作用产生的沉降,把这两者叠加作为总的地面沉降.李琳等[5]研究了成层土中基坑开挖降水引起的土中应力变化及周围地表沉降的求解方法.王卫东等[6]根据上海地区大量工程实测数据提出了地表沉降曲线的预估方法并验证了其合理性,提出了预估基坑开挖引起的建筑物附加变形的计算方法.目前,大部分学者对基坑施工引起周围土体不均匀沉降主要集中在考虑单一因素,但工程实际中周围土体的沉降主要由降水、支护结构变形等其他因素共同引起的,只有把几个重要因素结合起来考虑才能更能有效地反映出实际.施成华等[7]推导出了一种考虑渗流作用的基坑降水地表沉降计算公式,利用叠加原理最终得出由开挖和降水引起的地表沉降分布计算公式.本文综合考虑了降水、支护结构变形和基坑底部隆起这3个因素对周围土体沉降的影响,利用降水漏斗曲线来对土体进行分层沉降计算,然后叠加算出由于降水引起的土体沉降,根据支护结构的刚度和类型,推导出由于支护结构变形和坑底隆起两者共同引起的土体沉降,最终把由于降水和支护结构变形及其坑底隆起引起的土体沉降叠加修正后,得出基坑周围土体沉降的理论解析解.
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结论：基坑开挖降水对坑外地表沉降影响为关于基坑开挖降水方面的的相关大学硕士和相关本科毕业论文以及相关基坑降水要求论文开题报告范文和职称论文写作参考文献资料下载。
