吸力锚在粉质黏土中的上拔特性试验研究  

EXPERIMENTAL STUDY ON UPLIFT CHARACTERISTICS OF SUCTION ANCHOR IN SILTY CLAY

作　　者：练继建[1,2] 王芃文 乐丛欢[1,2] 马煜祥 Lian Jijian;Wang Pengwen;Le Conghuan;Ma Yuxiang(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点试验室,天津300350 [2]天津大学建筑工程学院,天津300350

出　　处：《太阳能学报》2021年第5期443-449,共7页Acta Energiae Solaris Sinica

基　　金：创新方法工作专项(2016IM030100);大连理工大学海岸和近海工程国家重点实验室开放课题基金(LP1709);天津市自然科学基金(18JCYBJC22800)。

摘　　要：开展吸力锚在粉质黏土中的上拔特性试验研究,揭示上拔过程中锚筒壁内、外侧所受土压力发展变化规律。结果表明:内壁土压力随着上拔高度的增加先减小至负压后增大为正压,直至稳定不变,最终土压力小于初始土压力;外壁土压力则呈近似线性减小的变化规律。在该试验中,吸力锚在上拔力的作用下,失效模式为底部张力破坏。基于试验结果,根据不排水剪强度和静力触探(CPT)运用规范可较准确确定的计算锚筒壁侧摩阻力,计算锚筒外壁侧摩阻力时的剪切强度系数α建议取较小值。锚筒端断面土的抗拉力理论计算值大于实测值。在该失效模式下,吸力锚最大上拔力随上拔速度的增大而增大。The vertical pull-up characteristic of suction anchor is an important content to guide engineering practice.In order to solve this problem,the uplift characteristics of suction anchor in silty clay were studied,and the law of development and variation of earth pressure on the inner and outer walls of anchor barrel during uplift was revealed.The results showed that the earth pressure on the inner wall first decreases to negative pressure and then increases to positive pressure with the uplift height until it remains stable,and the ultimate earth pressure is less than the initial earth pressure;the earth pressure on the outer wall decreases approximately linearly;the failure mode is the bottom tension failure;based on the test results,the calculation can be more accurately determined according to the undrained shear strength and static penetration test(CPT)code.It is suggested that the shear strength coefficient alpha should be smaller when calculating the lateral friction of the outer wall of the anchor barrel.The theoretical calculation value of the tension resistance of the section soil at the end of anchor barrel is larger than the measured value.Under this failure mode,the maximum pull-up force of suction anchor increases with the increase of pull-up speed.

关 键 词：物理模型试验 黏土 基础 锚-土相互作用 吸力锚 

分 类 号：TU43[建筑科学—岩土工程]