西安建筑科技大学学报(自然科学版)

为了解不同强度地震作用下锚固滑坡的动力响应特性,依托大型振动台模型试验,对锚固滑坡的加速度响应、锚杆受力特性等规律进行研究.试验结果表明:地震激励作用下,锚杆格构支护下的滑坡整体性较好,未产生明显的坡面效应.各测点PGA随加载强度的增大呈增大趋势; 不同高程处的加速度响应 “上大下小”,且随加载强度的增大,高程放大效应越来越明显.各测点PGA放大系数在低强度加载下,随加载强度增大略有减小,而中高强度加载下随加载强度的增大首先缓慢增大,然后趋于稳定.低强度加载下,锚杆主动抗震抗滑特性未完全发挥,各层锚杆的轴力峰值差异不大,底层锚杆的轴力峰值略高于其他四层; 随着加载强度的增大,锚杆主动抗震抗滑特性增强,各层锚杆受力情况发生了调整,最终调整为“第一层(顶层)>第五层(底层)>第三层>第四层>第二层”,且顶层锚杆的受力随加载强度增大而增大的趋势越来越明显,其他四层则趋于稳定.试验成果可为高烈度地区锚固滑坡的抗震设计提供重要参考.

In order to study the dynamic response of the landslide with anchorage system, a larger shaking table model test was conducted. In this paper, the acceleration response of anchorage body and mechanical properties of anchor were studied respectively at different magnitude. Results indicated that no matter at however or low high magnitude, the anchorage structure globosity was better, and had no obvios superficial effect. Acceleration response of measuring points present “top big and bottom small” type in elevation direction, and it became more and more obvious with the loading magnitude. PGA of the measuring points was increasing with the loading magnitude. At low magnitude, PGA amplification factors of measuring points slightly decres with the loading magnitude, while at middle and high magnitude, they increas with the loading magnitude first and then inclined to be stable. At low magnitude, the active anti-sliding and anti-seismic effect of anchorage structure can not fully play their roles, and consequently, the average axial force peak value of each anchor had not much difference, but the bottom anchor and bottom cross beam were slightly larger than that of other four layers. With the loading ampitude, this distribution type was changed, and at last it presented “the top layer> the bottom layer >the third layer>the fourth layer>the second layer”. In addition, the average axial force peak value of top anchor increased obviously, while other four layers tended to be stable. Research results of this paper are useful for aseismic design of landslide treatment with anchors and lattice beam in high intensity areas.

引言
1 振动台试验设计
2 试验结果分析
3 结论

图1 模型立面图<br/>Fig.1 Elevation drawing of the model

图1 模型立面图
Fig.1 Elevation drawing of the model

表1 相似关系及相似常数<br/>Tab.1 Similitude ratios and coefficients

表1 相似关系及相似常数
Tab.1 Similitude ratios and coefficients

图2 杆身应测点布设<br/>Fig.2 Layout of the measuring points of anchor

图2 杆身应测点布设
Fig.2 Layout of the measuring points of anchor

图3 输入地震波的加速度时程曲线及傅里叶谱<br/>Fig.3 Acceleration time history and Fourier spectrum of seismic waves

图3 输入地震波的加速度时程曲线及傅里叶谱
Fig.3 Acceleration time history and Fourier spectrum of seismic waves

表2 汶川波激励下各测点PGA值<br/>Tab.2 PGAof measuring points at Wenchuan wave

表2 汶川波激励下各测点PGA值
Tab.2 PGAof measuring points at Wenchuan wave

图4 汶川波激励下各测点加速度响应随加载强度的变化<br/>Fig.4 Acceleration response of measuring points with the loading magnitude at Wenchuan wave

图4 汶川波激励下各测点加速度响应随加载强度的变化
Fig.4 Acceleration response of measuring points with the loading magnitude at Wenchuan wave

图5 El Centro波激励下各测点加速度响应随加载强度的变化<br/>Fig.5 Acceleration response of measuring points with the loading magnitude at El Centro wave

图5 El Centro波激励下各测点加速度响应随加载强度的变化
Fig.5 Acceleration response of measuring points with the loading magnitude at El Centro wave

图6 汶川波激励下各层锚杆平均轴力峰值随加载强度的变化<br/>Fig.6 Stress characteristics of anchors and lattice beams with the loading magnitude at Wenchuan wave

图6 汶川波激励下各层锚杆平均轴力峰值随加载强度的变化
Fig.6 Stress characteristics of anchors and lattice beams with the loading magnitude at Wenchuan wave

图7 El Centro波激励下各层锚杆平均轴力峰值随加载强度的变化<br/>Fig.7 Stress characteristics of anchors and lattice beams with the loading magnitude at El Centro wave

图7 El Centro波激励下各层锚杆平均轴力峰值随加载强度的变化
Fig.7 Stress characteristics of anchors and lattice beams with the loading magnitude at El Centro wave

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备注

引言

1 振动台试验设计

2 试验结果分析

3 结论

期刊信息