锚杆–砂浆界面黏结滑移关系的试验研究与破坏过程解析

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摘要为研究岩石基础锚杆与砂浆界面的黏结滑移关系，分别进行室内短锚中心拉拔试验和现场长锚拉拔试验。在室内试验中，利用配置的6种水泥砂浆分析水泥砂浆强度和含砂率对黏结滑移关系的影响，得到试验的最优配合比。根据局部变形理论，建立能够描述长锚杆受上拔荷载作用时，锚杆–砂浆界面经历弹性状态、塑性软化和开裂滑移3个阶段的数学模型。应用该模型分析现场长锚杆试验数据，计算结果表明：(1) 当上拔荷载小于弹性极限荷载时，有效锚固长度为一恒定值，否则有效锚固深度将开始增加；(2) 当上拔荷载大于弹性极限荷载后，轴力F随深度z的衰减程度将因上部界面的软化和开裂而放缓。最后，得出有效锚固深度随上拔荷载增大而增加的计算公式。

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关键词 ：岩石力学, 锚杆, 水泥砂浆, 黏结滑移, 锚固深度, 剪切刚度

Abstract：To research the bond-slip relationship between the bolt and mortar for rock foundation，the pullout test for short bolt in laboratory and uplift test for long bolt in field were carried out respectively. In laboratory，6 kinds of mortar were mixed to analyze the effect of the compressive strength and sand ratio of mortar on bold-slip relationship. Then，the best mix proportion is presented. Based on the local deformation theory，a mathematics model is built，and it can describe the change process of bolt-mortar interface undergoing elastic，plastic softening and slip when the long bolt is subjected to the uplift load. The model was applied to analyzing the field test data. The results show as follows：(1) The effective anchorage depth is a constant value if uplift load is less than elastic ultimate load，or it will increase. (2) The attenuation degree of axis force with depth will slow because the interface plastic softening and cracking occur in top of bolt. Finally，the calculation formula of effective anchorage depth increasing with the increase in uplift load is presented.

Key words： rock mechanics bolt mortar bond-slip anchorage depth shear stiffness

收稿日期: 2010-04-06

引用本文:

刘波1，2，李东阳1，段艳芳1，金光玲1，田宁1. 锚杆–砂浆界面黏结滑移关系的试验研究与破坏过程解析[J]. 岩石力学与工程学报, 2011, 30(S1): 2790-2797.
LIU Bo1，2，LI Dongyang1，DUAN Yanfang1，JIN Guangling1，TIAN Ning1. EXPERIMENTAL STUDY OF BOND-SLIP RELATIONSHIP BETWEEN BOLT AND MORTAR AND THEORETICAL SOLUTION TO FAILURE PROCESS. , 2011, 30(S1): 2790-2797.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/2790

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