均质边坡离心试验锚杆的应力响应及布设探究
发布时间：2018-12-30 14:39
【摘要】：以低碳钢片模拟全长黏结锚杆,开展均质岩质边坡离心模型试验,研究了锚杆的应力响应规律。基于试验模型锚杆应力响应规律启发及实际均质边坡变形破坏演变规律,提出仅针对边坡松弛区进行局部强度折减,数值模拟探讨了均质岩质边坡单锚应力监测的较佳位置。结果表明:均质岩质边坡变形破坏起始于坡脚的剪切破坏,且随着边坡变形破坏的开展,靠近坡脚的全长黏结锚杆会较早产生明显的应力响应,锚杆应力增长速率会不断增加;锚杆应力监测点距离边坡潜在滑动面(塑性变形区)越近,锚杆应力响应时间越早,且量值越大;建议在距离坡脚0.25~0.35 H(H为边坡高度)的坡面处布设监测锚杆,但对于具体监测边坡对象,应具体问题具体分析。研究成果可为均质岩质边坡的锚杆监测工作提供一定的参考借鉴。
[Abstract]:The full length bonded anchor rod was simulated by low carbon steel sheet, and the stress response of the bolt was studied by centrifugal model test of homogeneous rock slope. Based on the experimental model of stress response of anchor rod and the evolution of deformation and failure of homogeneous slope, it is proposed that the local strength is reduced only in the relaxation zone of the slope, and the better position of single anchor stress monitoring for homogeneous rock slope is discussed by numerical simulation. The results show that the deformation and failure of homogeneous rock slope begin with the shear failure of the slope foot, and with the development of slope deformation and failure, the stress response of the full-length bonded anchor near the slope foot will be more obvious than that of the slope foot, and the stress growth rate of the anchor rod will continue to increase. The closer the anchor stress monitoring point is to the potential slip surface of the slope (plastic deformation zone), the earlier the stress response time of the anchor rod is and the larger the value is. It is suggested that the monitoring bolt should be placed on the slope surface at 0.25 ~ 0.35 H (H distance from the foot of the slope, but the concrete problems should be analyzed concretely for the specific monitoring object of the slope. The research results can be used for reference for the monitoring of homogeneous rock slope.
【作者单位】： 长安大学公路学院;广西壮族自治区交通规划勘察设计研究院;宁波正信检测科技有限公司;宁波交通工程建设集团有限公司;长安大学地测学院;
【基金】：国家自然科学基金项目(41272285) 宁波交通运输科技项目(201605)~~
【分类号】：TU476
本文编号：2395714
[Abstract]:The full length bonded anchor rod was simulated by low carbon steel sheet, and the stress response of the bolt was studied by centrifugal model test of homogeneous rock slope. Based on the experimental model of stress response of anchor rod and the evolution of deformation and failure of homogeneous slope, it is proposed that the local strength is reduced only in the relaxation zone of the slope, and the better position of single anchor stress monitoring for homogeneous rock slope is discussed by numerical simulation. The results show that the deformation and failure of homogeneous rock slope begin with the shear failure of the slope foot, and with the development of slope deformation and failure, the stress response of the full-length bonded anchor near the slope foot will be more obvious than that of the slope foot, and the stress growth rate of the anchor rod will continue to increase. The closer the anchor stress monitoring point is to the potential slip surface of the slope (plastic deformation zone), the earlier the stress response time of the anchor rod is and the larger the value is. It is suggested that the monitoring bolt should be placed on the slope surface at 0.25 ~ 0.35 H (H distance from the foot of the slope, but the concrete problems should be analyzed concretely for the specific monitoring object of the slope. The research results can be used for reference for the monitoring of homogeneous rock slope.
【作者单位】： 长安大学公路学院;广西壮族自治区交通规划勘察设计研究院;宁波正信检测科技有限公司;宁波交通工程建设集团有限公司;长安大学地测学院;
【基金】：国家自然科学基金项目(41272285) 宁波交通运输科技项目(201605)~~
【分类号】：TU476
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