降水对基坑开挖支护影响的数值模拟分析
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摘要
对基坑在开挖支护施工过程中的土体应力和位移情况进行了数值计算,对考虑与不考虑降水的模拟结果进行对比,结果表明两者的位移分布规律相似,但降水有利于减小坑底隆起,降水时产生的地表沉降较大;随着开挖的进行,基坑开挖面以下土体单元卸载,内支撑支护有效提高了支护结构的整体稳定性。
In this paper,the stress of the soil,the displacements of pit wall in the course of excavation are calculated.In comparison with two simulation results with and without considering dewatering respectively,the displacement distribution is similar.However,dewatering is beneficial to reducing the bottom uplift and horizontal displacement,and enlarging the surface subsidence.With the unloading of soil units under excavation work face,the horizontal stress of pit wall soil shows an alternate form of increasing and reducing.The inner supports effectively improve stability of the supporting structure.
In this paper,the stress of the soil,the displacements of pit wall in the course of excavation are calculated.In comparison with two simulation results with and without considering dewatering respectively,the displacement distribution is similar.However,dewatering is beneficial to reducing the bottom uplift and horizontal displacement,and enlarging the surface subsidence.With the unloading of soil units under excavation work face,the horizontal stress of pit wall soil shows an alternate form of increasing and reducing.The inner supports effectively improve stability of the supporting structure.
引文
[1]刘继国,曾亚武.FLAC3D在深基坑开挖与支护数值模拟中的应用[J].岩土力学,2006(41):22.
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[3]秦四清.深基坑工程优化设计[M].北京:地震出版社,1998.
[4]尉希成,周美玲.支挡结构设计手册[M].北京:中国建筑工业出版社,2004.
[5]罗海毅.某工程基坑降水及边坡支护施工技术[J].山西建筑,2007,33(30):128-129.
[6]严三保,胡庆兴,王昌义.基坑降水方案比较与设计参数的确定[J].南京工业大学学报(自然科学版),2004(4):41.
[2]张丙强.内撑式支护软土基坑有限元分析[J].岩土工程界,2006(27):18.
[3]秦四清.深基坑工程优化设计[M].北京:地震出版社,1998.
[4]尉希成,周美玲.支挡结构设计手册[M].北京:中国建筑工业出版社,2004.
[5]罗海毅.某工程基坑降水及边坡支护施工技术[J].山西建筑,2007,33(30):128-129.
[6]严三保,胡庆兴,王昌义.基坑降水方案比较与设计参数的确定[J].南京工业大学学报(自然科学版),2004(4):41.
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