【摘要】：以低碳鋼片模擬全長黏結(jié)錨桿,開展均質(zhì)巖質(zhì)邊坡離心模型試驗(yàn),研究了錨桿的應(yīng)力響應(yīng)規(guī)律�；谠囼�(yàn)?zāi)Ｐ湾^桿應(yīng)力響應(yīng)規(guī)律啟發(fā)及實(shí)際均質(zhì)邊坡變形破壞演變規(guī)律,提出僅針對(duì)邊坡松弛區(qū)進(jìn)行局部強(qiáng)度折減,數(shù)值模擬探討了均質(zhì)巖質(zhì)邊坡單錨應(yīng)力監(jiān)測(cè)的較佳位置。結(jié)果表明:均質(zhì)巖質(zhì)邊坡變形破壞起始于坡腳的剪切破壞,且隨著邊坡變形破壞的開展,靠近坡腳的全長黏結(jié)錨桿會(huì)較早產(chǎn)生明顯的應(yīng)力響應(yīng),錨桿應(yīng)力增長速率會(huì)不斷增加;錨桿應(yīng)力監(jiān)測(cè)點(diǎn)距離邊坡潛在滑動(dòng)面(塑性變形區(qū))越近,錨桿應(yīng)力響應(yīng)時(shí)間越早,且量值越大;建議在距離坡腳0.25~0.35 H(H為邊坡高度)的坡面處布設(shè)監(jiān)測(cè)錨桿,但對(duì)于具體監(jiān)測(cè)邊坡對(duì)象,應(yīng)具體問題具體分析。研究成果可為均質(zhì)巖質(zhì)邊坡的錨桿監(jiān)測(cè)工作提供一定的參考借鑒。
[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.
【作者單位】： 長安大學(xué)公路學(xué)院;廣西壯族自治區(qū)交通規(guī)劃勘察設(shè)計(jì)研究院;寧波正信檢測(cè)科技有限公司;寧波交通工程建設(shè)集團(tuán)有限公司;長安大學(xué)地測(cè)學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(41272285) 寧波交通運(yùn)輸科技項(xiàng)目(201605)~~
【分類號(hào)】：TU476

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