【作者】 刘金龙； 王吉利； 袁凡凡；

【Author】 LIU Jin-long~1,WANG Ji-li~2,YUAN Fan-fan~2 (1.Department of Civil Engineering,Hefei University,Hefei 230022,China; 2.Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

【机构】 合肥学院建筑工程系； 中国科学院武汉岩土力学研究所；

【摘要】 传统计算方法一般根据隔水土层的自重压力等于承压水的顶托力来确定基坑突涌的临界厚度,其没有考虑隔水层土体的抗剪强度,分析结果往往偏于保守。本文根据基坑底部隔水层的受力平衡,提出一种可以考虑土体抗剪强度影响的基坑突涌安全系数与隔水层临界厚度计算公式。应用于相关实例计算表明,基于本文所提公式所得的计算结论与现场实际取得了很好的一致。为了安全起见,建议只有基坑突涌安全系数和隔水层厚度同时满足要求时才可判为无突涌威胁。更多还原

【Abstract】 In traditional calculation method,the critical thick of water-resisting layer at foundation pit can be got by comparing the gravity of water-resisting layer and water pressure of artesian aquifer,which had not considered the influence of shear strength of soil.The result of traditional calculation method is conservative to reality.Based on force equilibrium analysis of water-resisting layer,formulas for calculating safety factor of abrupt gush and critical thick of water-resisting layer have been proposed in this article,which considered the influence of shear strength of soil.Some cases have been studied with those new formulas.It had been found that the result of those new formulas is coincident with realities.In order to ensure the security of foundation pit,it is advised that foundation pit can be adjudged safety only both the safety factor of abrupt gush and critical thick of water-resisting layer satisfying requirements.更多还原