土钉支护的优化设计
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摘要
用Flac软件对现有常规设计的土钉支护过程进行数值模拟,验证其对土钉支护设计的可行性;用Flac软件对无支护开挖过程进行数值模拟,以研究土体应力和位移随时间发展的变化规律;通过分析和计算,求得坡体最危险滑移面的位置和形状。根据求得的最危险滑移面的形状和位置,根据不同坡高采用最佳土钉长度,以达到优化设计,并用Flac进行数值模拟验证。研究结果表明,经过土钉支护后,整个开挖面是稳定的,并且位移计算结果与实际检测结果一致,表明用Flac对土钉支护的最危险滑移面进行模拟计算是可行的。
According to the Flac model,the imitating digging of soil nailing wall to validate feasibility of Flac model was analysed,and the relationship among the earth stress and soil displacement and time was studied.On the basis of calculation and analysis,the exact location and shape of the most dangerous slip surface were obtained,which can be used to offer the optimal parameter of soil nailing.According to the method of optimization design of soil nailing,it was used in the field which has achieved desired effects.The results show that the digged surface is stable after optimization design,and the calculated displacement is accordance with actual one,which shows that it is practical to stimulate and compute the location and shape of the most dangerous slip surface which is soil nailed using Flac software.
According to the Flac model,the imitating digging of soil nailing wall to validate feasibility of Flac model was analysed,and the relationship among the earth stress and soil displacement and time was studied.On the basis of calculation and analysis,the exact location and shape of the most dangerous slip surface were obtained,which can be used to offer the optimal parameter of soil nailing.According to the method of optimization design of soil nailing,it was used in the field which has achieved desired effects.The results show that the digged surface is stable after optimization design,and the calculated displacement is accordance with actual one,which shows that it is practical to stimulate and compute the location and shape of the most dangerous slip surface which is soil nailed using Flac software.
引文
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[2]李林山.喷锚支护与土钉墙[J].岩土工程技术,1998(3):24-26.LI Lin-shan.Shot-anchoring protection and soil-nailing wall[J].Geotechnical Engineering Technique,1998(3):24-26.
[3]王士川.土钉支护结构的拉剪联合作用分析[J].西安建筑科技大学学报,1999,32:215-218.WANG Shi-chuan.Analysis on soil-nailed retaining structures with axial-shear combined force[J].J Xi’an Univ of Arch and Tech,1999,32:215-218.
[4]Juran I.Kinematical limited analysis for design of soil-nailed structures[J].Journal of Geotechnical Engineering,1990,166(1):54-72.
[5]罗晓辉.基坑开挖土钉墙支护稳定性的优化分析[J].岩土工程技术,1998(3):9-13.LUO Xiao-hui.Evaluation on stability of trench strengthened with soil nail based on reliability analysis[J].Geotechnical Engineering Technique,1998(3):9-13
[6]Kingsley H W.Arch in soil arching[J].Journal of Geotechnical Engineering,1989,115(3):415-419.
[7]张明聚,宋二祥.土钉支护的三维非线性有限元分析[J].工程力学,1998(增刊):341-346.ZHANG Ming-ju,SONG Er-xiang.3D nonlinear finite element analysis on composite bracing of anchor rods with soil nail[J].Engineering Mechanics,1998(Suppl):341-346.
[8]秦四清.深基坑工程优化设计[M].北京:地震出版社,1998.QING Si-qing.Optimum design of foundation pit[M].Beijing:Earthquake Press,1998.
[9]杨孟刚,胡建华,陈政清.独塔自锚式悬索桥地震响应分析[J].中南大学学报:自然科学版,2005,36(1):133-137.YANG MENG-gang,HU Jian-hua,CHEN Zheng-qing.Seismic response analysis of self-anchored suspension bridge with single-tower[J].Journal of Central South University:Science and Technology,2005,36(1):133-137.
[10]贺若兰,张平,李宁,等.拉拔工况下全长粘结锚杆工作机理[J].中南大学学报:自然科学版,2006,37(2):401-406.HE Ruo-lan,ZHANG Pin,LI Ning,et al.Working mechanism of fully grouted bolt in pull-out working state[J].Journal of Central South University:Science and Technology,2006,37(2):401-406.
[11]韩永强.土钉墙稳定性分析[J].西安工业学院学报,1999,19(2):155-158.HANG Yong-qiang.Stability analysis of the soil-nailed wall[J].J Xi’an Institute of Technology,1999,19(2):155-158.
[12]杨雪强.锚钉联合加固基坑边坡的设计方法[J].福建建筑,2000(增刊):48-50.YANG Xue-qiang.Design method about deep cuts reinforced by anchor and soil nails[J].Fujian Construction,2000(Suppl):ZHONG Zheng-xiong.Developments and research of nail 48-50.
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