基坑设计的杆系–荷载–弹簧模型荷载取值及变形和稳定性分析的若干问题和研究建议

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摘要作为当前基坑设计主流方法，杆系–荷载–弹簧模型还有几个问题没有解决。围护结构上的水土压力的统一计算方法，论证水土压力统一计算理论的合理性。目前为杆系–荷载–弹簧模型设计方法所构造的安全系数可能不足以覆盖基坑的所有破坏模式；建立新的控制基坑稳定的安全系数以及对既有安全系数进行改造以使其能够考虑尺寸效应是基坑研究的重要任务之一。目前基坑设计方法考虑安全系数对基坑变形的影响，与常规的安全系数的概念不同，这一点基坑研究时要引起注意。提出一个考虑圆形基坑的杆系有限元算法，建议一个被动区土体弹簧的双刚度模型，可以在用杆系有限元分析时考虑圆形基坑的尺寸效应和长条形基坑土方开挖的空间效应，为基坑研究指出一些方向。

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关键词 ：地基基础；基坑；杆系&ndash, 荷载&ndash, 弹簧模型；水土压力；安全系数；尺寸效应；圆形基坑；条形基坑

Abstract：As the present main design method of excavation engineering，the bar-load-spring model，naturally induces several problems which need to be solved. A unified calculation method of the pressure on the supporting structure considering the soil-water interaction is presented，which is more reasonable in the load calculation. Since safety factors system based on the bar-load-spring theory may not be enough to incorporate all the failure modes of foundation pits，new safety factors controlling stability of foundation pits and existing safety factor modified to reflect the size effect should be recommended. Current excavation design method took the influence of safety factor on deformation into account，which was different from the idea of traditional safety factors. Two bar system FEMs such as the bar-load-spring model of circular pits and double stiffness model of soil spring at the passive zone are proposed，which can consider size effect of circular pits and space effect of soil excavation divided into block in strip foundation. Some future research directions on excavation are pointed out.

Key words： foundation foundation pit bar-load-spring model water-soil pressure safety factor size effect circular pit strip pit

收稿日期: 2013-05-19

引用本文:

王洪新1，2，周松1. 基坑设计的杆系–荷载–弹簧模型荷载取值及变形和稳定性分析的若干问题和研究建议[J]. 岩石力学与工程学报, 2013, 32(11): 2349-2358.
WANG Hongxin1，2，ZHOU Song1. SEVERAL ISSUES ON DEFORMATION AND STABILITY ANALYSIS OF BAR-LOAD-SPRING MODEL OF FOUNDATION PIT DESIGN AND RECOMMENDATIONS. , 2013, 32(11): 2349-2358.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I11/2349

[1]	刘国彬，黄院雄，侯学渊. 考虑时空效应的等效土体水平抗力系数的取值研究[J]. 土木工程学报，2001，34(3)：97-102.(LIU Guobin，HUANG Yuanxiong，HOU Xueyuan. Study on equivalent lateral resistance factor of soils in excavation[J]. China Civil Engineering Journal，2001，34(3)：97-102.(in Chinese)) " target="_blank">
[5]	姚秦. 基坑工程的水土压力混合算法[J]. 岩石力学与工程学报，2001，20(1)：134-135.(YAO Qin. Earth pressure calculation considering soil-water jointly on excavation[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(1)：134-135.(in Chinese))
[6]	徐日庆，张庆贺，刘鑫，等. 考虑渗透性的水-土压力计算方法[J]. 岩土工程学报，2012，34(5)：961-964.(XU Riqing，ZHANG Qinghe，LIU Xin，et al. Methods for calculating soil-water pressure considering permeability[J]. Chinese Journal of Geotechnical Engineering，2012，34(5)：961-964.(in Chinese))
[8]	王洪新，陈建军，刘翼山. 基坑抗隆起稳定安全系数实用计算分析与应用[J]. 岩石力学与工程学报，2007，26(增1)：3 223-3 230. (WANG Hongxin，CHEN Jianjun，LIU Jishan. Practical calculation analysis and application of safety coefficient of heave-resistant stability of foundation pit[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(Supp.1)：3 223-3 230.(in Chinese)) " target="_blank">
[13]	刘建航，侯学渊. 基坑工程手册[M]. 北京：中国建筑出版社，1997：218.(LIU Jianhang，HOU Xueyuan. Manual of foundation pit engineering[M]. Beijing：China Architecture and Building Press，1997：218.(in Chinese)) " target="_blank">
[14]	王洪新. 考虑二维和三维尺寸效应的基坑抗隆起稳定安全系数[J]. 岩土工程学报，待刊.(WANG Hongxin. A new safety coefficient of heave-resistant stability considering two-dimensional and three- dimensional size effect of foundation pits[J]. Chinese Journal of Geotechnical Engineering，to be published.(in Chinese)) " target="_blank">
[17]	王洪新. 圆形基坑围护结构稳定性计算分析[J]. 地下空间与工程学报，2011，7(增2)：1 653-1 659.(WANG Hongxin. Calculation analysis of stability of retaining structure on circular foundation pit[J]. Chinese Journal of Underground Space and Engineering，2011，7(Supp.2)：1 653-1 659.(in Chinese)) " target="_blank">
[3]	王洪新. 水土压力分算与合算的统一算法[J]. 岩石力学与工程学报，2011，30(5)：1 057-1 064.(WANG Hongxin. The unified method of separate and combined calculation of water and soil pressure[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(5)：1 057-1 064.(in Chinese)) " target="_blank">
[4]	王洪新. 水土压力统一计算理论的证明及水土共同作用下的压力计算[J]. 岩石力学与工程学报，2012，31(2)：392-398.(WANG Hongxin. Verification of unified calculation theory of water and earth pressures and calculation of pressure under interaction of water and earth[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(2)：392-398.(in Chinese))
[7]	王洪新. 考虑土对水吸附性的渗流破坏理论与应用[J]. 岩石力学与工程学报，2013，32(3)：562-571.(WANG Hongxin. Seepage failure theory considering water-soil adsorption and its engineering application[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(3)：562-571.(in Chinese))
[11]	王洪新. 基坑宽度对围护结构稳定性的影响[J]. 土木工程学报，2011，44(6)：120-126.(WANG Hongxin. Influence of excavation width on enclosure-structure stability of foundation pits[J]. China Civil Engineering Journal，2011，44(6)：120-126.(in Chinese)) " target="_blank">
[2]	肖晓春，袁金荣，朱雁飞. 新加坡地铁环线C824标段失事原因分析(二)——围护体系设计中的错误[J]. 现代隧道技术，2009，46(6)：28-34.(XIAO Xiaochun，YUAN Jinrong，ZHU Yanfei. Causation analysis of the collapse on singapore mrt circle line lot C824(part Ⅱ)—critical design errors in temporary retaining system[J]. Modern Tunnelling Technology，2009，46(6)：28-34.(in Chinese)) " target="_blank">
[9]	刘国彬，王洪新. 上海浅层粉砂地层承压水对基坑的危害及治理[J]. 岩土工程学报，2002，24(6)：790-792.(LIU Guobin，WANG Hongxin. Influence of the pressure water in shallow silty sand in Shanghai on excavation[J]. Chinese Journal of Geotechnical Engineering，2002，24(6)：790-792.(in Chinese))
[10]	王洪新，周松. 基坑围护结构的抗冲剪稳定安全系数的计算与应用[J]. 岩石力学与工程学报，2012，31(11)：2 312-2 318.(WANG Hongxin，ZHOU Song. Calculation of safety factor of punching shear-resistant stability for retaining structure of foundation pits and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(11)：2 312-2 318.(in Chinese)) " target="_blank">
[12]	上海市市政工程管理局. SZ-08-2000 上海地铁基坑工程施工规程[S]. 上海：[s.n.]，2000.(Shanghai Municipal Engineering Administration Bureau. SZ-08-2000 Specification for excavation in Shanghai metro construction[S]. Shanghai：[s.n.]，2000.(in Chinese)) " target="_blank">
[15]	王洪新，孙玉永. 考虑基坑开挖宽度的杆系有限元算法及试验研究[J]. 岩土力学，2012，33(9)：2 781-2 787.(WANG Hongxin，SUN Yuyong. Test study and bar system FEM for foundation pits considering excavation width[J]. Rock and Soil Mechanics，2012，33(9)：2 781-2 787.(in Chinese)) " target="_blank">
[16]	应宏伟，聂文峰，郭雷，等. 考虑基坑卸载影响的改进弹性抗力法及其应用[J]. 岩土力学，2011，32(增1)：129-133.(YING Hongwei，NIE Wenfeng，GUO Lei，et al. A modified beam-spring model method and its application considering unloading effect during excavation[J]. Rock and Soil Mechanics，2011，32(Supp.1)：129-133.(in Chinese)) " target="_blank">