摘要
针对盾构施工过程中诱发的地表沉降量预测问题,将地表下沉视为一随机过程,运用随机介质理论对地表下沉量进行预测计算,将隧道周围的收敛量ΔR分为3个组成部分,即开挖面处应力释放引起的超挖量、偏心超挖量以及盾尾施工间隙.目的是为了在利用随机介质理论预测地表沉降量时,将盾构过后隧道周围的弹塑性位移对盾尾施工间隙的影响考虑进去,使得预测结果更加可靠.提出的计算断面收敛量的方法并结合随机介质理论预测得到的地表沉降数据和沉降曲线趋势与实际结果符合.并通过计算发现此二维弹塑性位移对盾尾施工间隙的影响不容忽视.考虑了盾尾弹塑性位移后的预测结果与实测结果更加接近.
For the problem of predicting the surface subsidence induced by shield construction,the surface settlement was taken as a random process,and stochastic medium theory was employed to predict the amount of surface settlement.The convergence magnitude around a tunnel can be divided into three components,they are the amount of overbreak caused by the release of stress in the excavation face,the amount of eccentric over break,and shield tail clearance by construction.The purpose of the study is that when using the random medium theory to predict the surface subsidence,the filling effect of elastoplastic mechanical strain state for the single hole shield tunnel excavation can be taken into consideration so as to make the prediction results more accurate.The predict results for surface subsidence obtained from the method for calculating convergence value of section in this paper and stochastic medium theory are matched well with the site monitory value.And it is found that the influence of two-dimensional elastic-plastic displacements after shield tunnel construction on the shield tail clearance should not be ignored,and that it is more close to the measured results for the prediction results after considering the elastoplastic displacement.
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2014年第4期527-533,共7页
Journal of Henan Polytechnic University（Natural Science）
关键词
随机介质理论
地表沉降
断面收敛
施工因素
弹塑性理论
stochastic medium theory
surface settlement
section convergence
construction factors
theory of elasticity
