摘要
为进一步研究大直径矩形顶管开挖面稳定性,通过建立实际工程地质数值模型,对大直径矩形顶管发生主动极限破坏时开挖面前方土体的破坏区域进行简化;基于破坏模式,改进现有的楔形体计算模型,推导矩形截面主动极限支护压力的计算方法;将该方法得到的极限支护力值与实际工程计算结果进行对比验证合理性,继而进行影响因素敏感性分析。结果表明:提出的梯形楔形体计算模型与数值模拟结果相近,且优于等效截面计算结果,可见研究结果能够为大直径矩形顶管在土层中顶进时的确定合理的支护压力提供依据。
In order to further study the stability of large diameter rectangular pipe jacking tunnel face,when active limit failure of large diameter rectangular pipe jacking occurred,the failure area of soil mass in front of tunnel face was simplified by establishing a practical engineering geological numerical model.Based on the failure mode,the existing wedge calculation model was improved,and the calculation method of active limit support pressure of rectangular section was deduced.The limit support force obtained by this method was compared with calculation results obtained by the actual engineering to verify the rationality,and then the sensitivity analysis of influencing factors was carried out.The results show that the proposed calculation model of trapezoidal wedge is close to the numerical simulation results,and it is better than the results calculated by equivalent section.Therefore,this study can provide help for determining the reasonable support pressure of large diameter rectangular pipe jacking in the soil.
作者
丁万涛
王中荣
郭晓炜
陈瑞
DING Wan-tao;WANG Zhong-rong;GUO Xiao-wei;CHEN Rui(Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China;School of Qilu Transportation, Shandong University, Jinan 250002, China;China Railway 14th Bureau Group Shield Engineering Co,.Ltd., Nanjing 211800, China)
出处
《科学技术与工程》
北大核心
2021年第22期9563-9569,共7页
Science Technology and Engineering
基金
国家自然科学基金(41572275)。
关键词
矩形顶管
开挖面
破坏模式
支护压力
rectangular pipe jacking
tunnel face
failure mode
support pressure
