围压对锚杆砂浆锚固力影响的试验研究
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摘要
锚杆作为边坡支护的一种常用手段,其抗拔力受周围岩土体围压影响,进而影响边坡稳定.针对围压对砂浆试件锚固力的影响及其破坏形态进行试验研究,得出以下结论:单向围压力在0～100kN范围内,随着围压力值的增大,抗拔力逐渐增大;当单向围压力达到70～90kN时,抗拔力增长趋势较围压力0～70kN时逐渐放缓;随着围压力的增大,试件破碎程度逐渐减弱,从砂浆碎裂、锚杆拔出到砂浆只有裂隙、锚杆脱粘,而不碎裂.
As a commonly-used method of slope support,the anchorage force is affected by the confining pressure of surrounding rock and soil,which affects the stability of the slope.In this paper,the effect of confining pressure on the anchorage force of mortar specimens and its failure modes are studied experimentally,and the following conclusions are drawn:One-way confining pressure is in the range of 0～100 kN.As the surrounding pressure increases,the pull-out force increases gradually.When the one-way confining pressure reaches 70～90 kN,the pull-out force growth trend is gradually slower than the confining pressure 0～70 kN.With the increase of the confining pressure,the crushing degree of the test piece gradually weakened.From the cracking of the mortar,pulling out of the anchor rod to the mortar,only the cracks and the anchor rod de-bonded without cracking.
As a commonly-used method of slope support,the anchorage force is affected by the confining pressure of surrounding rock and soil,which affects the stability of the slope.In this paper,the effect of confining pressure on the anchorage force of mortar specimens and its failure modes are studied experimentally,and the following conclusions are drawn:One-way confining pressure is in the range of 0～100 kN.As the surrounding pressure increases,the pull-out force increases gradually.When the one-way confining pressure reaches 70～90 kN,the pull-out force growth trend is gradually slower than the confining pressure 0～70 kN.With the increase of the confining pressure,the crushing degree of the test piece gradually weakened.From the cracking of the mortar,pulling out of the anchor rod to the mortar,only the cracks and the anchor rod de-bonded without cracking.
引文
[1]刘超,张东明,尚德磊,赵宏刚,宋真龙,俞欢.峰后围压卸载对原煤变形和渗透特性的影响[J/OL].岩土力学,2018(6):1~9
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[3]李清淼.加卸载围压条件下岩石峰后力学特性试验研究[D].重庆大学,2015
[4]郑清达,李进国,纪伟杰,赵相东,王在泉.不同卸围压速率对岩石破坏过程能量演化的影响研究[J].青岛理工大学学报,2017,38(6):8-12+26
[5]赵永川,杨天鸿,秦涛,汪泓.围压效应对钙泥质胶结砂岩强度和变形的影响[J].东北大学学报(自然科学版),2018,39(2):254~259
[2]尤明庆.围压对岩石试样强度的影响及离散性[J].岩石力学与工程学报,2014,33(5):929~937
[3]李清淼.加卸载围压条件下岩石峰后力学特性试验研究[D].重庆大学,2015
[4]郑清达,李进国,纪伟杰,赵相东,王在泉.不同卸围压速率对岩石破坏过程能量演化的影响研究[J].青岛理工大学学报,2017,38(6):8-12+26
[5]赵永川,杨天鸿,秦涛,汪泓.围压效应对钙泥质胶结砂岩强度和变形的影响[J].东北大学学报(自然科学版),2018,39(2):254~259