基坑土钉支护设计的简单算法研究
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摘要
土钉支护技术在深基坑开挖和支护中已得到了广泛的应用,但对其工作机制和计算方法的研究尚不完善。目前数值模拟算法较多,但其本构模型准确地选择及相关参数的确定需要进行大量的三轴试验或真三轴试验。基于此,提出3个假设,建立简单的计算模型,并对土钉的工作机制深入研究,得到土钉拉力的"二半支抛物线"分布规律,推导出土钉支护设计的解析算法相关公式。以徐州彭城地下广场深基坑土钉支护工程为例,进行土钉拉力现场测试,对基坑水平位移、沉降进行观测,所测数据验证了文中公式的可靠性,为类似基坑工程的设计和施工提供参考。
The technique of soil nailing has already got an extensive application to deep foundation pit engineering, but the research of its work mechanism and the calculation method is still not perfect. Now the numerical simulation experiments are prevalent; but it must to do a large numbers of triaxial or true triaxial tests to gain the exact model and other parameters for local soil. So a simple calculation model is founded based on three supposes, the writer also studies on the work mechanism of soil nailing and finds the regulation that Curve of nail stress is "Two half parabola", and the concerned formulas is deduced. Combining the Pengcheng underground square engineering, the data of displacement for pit are measured. The stresses of soil nailing are also measured; these data verifies the accuracy of the formulas. The analytical algorithm is worth for reference in the similar case.
The technique of soil nailing has already got an extensive application to deep foundation pit engineering, but the research of its work mechanism and the calculation method is still not perfect. Now the numerical simulation experiments are prevalent; but it must to do a large numbers of triaxial or true triaxial tests to gain the exact model and other parameters for local soil. So a simple calculation model is founded based on three supposes, the writer also studies on the work mechanism of soil nailing and finds the regulation that Curve of nail stress is "Two half parabola", and the concerned formulas is deduced. Combining the Pengcheng underground square engineering, the data of displacement for pit are measured. The stresses of soil nailing are also measured; these data verifies the accuracy of the formulas. The analytical algorithm is worth for reference in the similar case.
引文
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[11]高文华,沈蒲生,杨林德.基坑开挖中地层移动的影响因素分析[J].岩石力学与工程学报,2002,21(8):1153-1157.GAO Wen-hua,SHEN Pu-sheng,YANG Lin-de.Influence factors on ground deformation during excavation[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(8):1153-1157.
[2]杨光华.深基坑支护结构的实用计算方法及其应用[M].北京:中国地质出版社,2004.
[3]杨志银,张俊,王凯旭.复合土钉墙技术的研究及应用[J].岩土工程学报,2005,27(2):153-156.YANG Zhi-yin,ZHANG Jun,WANG Kai-xu.The research and application on composite soil nailing walls[J].Chinese Journal of Geotechnical Engineering,2005,27(2):153-156.
[4]陈晓文.广州凯华城基坑采用土钉墙支护设计实践[J].岩石力学与工程学报,2004,23(17):3021-3029.CHEN Xiao-wen,YANG Guang-hua,ZHANG Jun-lu,et al.Support design practice using soil nailing wall in Guangzhou Kaihuacheng deep foundation pit[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(17):3021-3029.
[5]钱家欢.土力学[M].南京:河海大学出版社,1995.
[6]韩立军.岩土加固技术[M].徐州:中国矿业大学出版社,2005.
[7]李广信.高等土力学[M].北京:清华大学出版社,2004.
[8]陈善民.水泥土动力特性室内实验及复合地基抗震特性分析[J].浙江大学学报,2000,34(4):399-403.CHEN Shan-min.Experimental determination of dynamic properties of cement-treated soil and earthquake behavior of composite foundation[J].Journal of Zhejiang University,2000,34(4):399-403.
[9]何世秀.深基坑支护设计影响因素的有限元分析[J].岩石力学与工程学报,2005,24(增2):5479-5484.HE Shi-xiu.Finite element analysis of influence factors for timbering design of deep foundation pit[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.2):5479-5484.
[10]高文华,杨林德,沈蒲生.软土深基坑支护结构内力与变形时空效应的影响因素分析[J].土木工程学报,2001,34(5):90-96.GAO Wen-hua,YANG Lin-de,SHEN Pu-sheng.Influencing factors′analysis of the space-time effect on the timbering structure internal force and transmutation of soft clay deep foundation pit[J].China Civil Engineering Journal,2001,34(5):90-96.
[11]高文华,沈蒲生,杨林德.基坑开挖中地层移动的影响因素分析[J].岩石力学与工程学报,2002,21(8):1153-1157.GAO Wen-hua,SHEN Pu-sheng,YANG Lin-de.Influence factors on ground deformation during excavation[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(8):1153-1157.
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