【作者】 邹新军； 杨眉；

【Author】 ZOU Xin-jun YANG Mei (Institute Geotechnical Engineering,Hunan Univ,Changsha,Hunan 410082,China)

【机构】 湖南大学岩土工程研究所；

【摘要】 在深入分析双向增强体复合地基中土拱效应的形成机理、力学特点及其影响因素的基础上,引入统一强度理论,建立出土体弹塑性平衡微分方程,由此导出梅花形与长方形布桩时加筋垫层上下方桩顶压力、桩间土压力及桩土应力比的计算公式,并据此讨论了填料粘聚力、内摩擦角及桩间距等参数对桩土荷载分担比的影响规律.最后,结合某工程实测数据进行了验证,结果表明,桩土应力比理论预测值与实测值吻合较好.更多还原

【Abstract】 To discuss the soil arching effect in the bidirectionally reinforced composite foundation,the form- ing mechanism,mechanical behavior and its affected factors were fist deeply analyzed.Then,the unified strength theory was introduced to set up the elastic-plastic equilibrium differential equation of the subsoil under the limit equilibrium state.And from the equation,the solutions were derived with the corresponding formulas presented to calculate the earth pressure over and beneath the horizontal reinforced cushion or pillow,the stress of inter-pile soil and the stress concentration from the soil to piles.And based on the obtained solutions,the in- fluencing rules by the cohesion c and internal friction angleψof filling material and pile space on the pile-soil stress ratio n were discussed respectively.Lastly,the reliability is verified by an engineering project,in which the predicted value of pile-soil stress ratio n by the present method agrees well with the measured data.更多还原