本文選題：錨索　切入點(diǎn)：預(yù)應(yīng)力損失　出處：《巖土力學(xué)》2017年02期 　論文類(lèi)型：期刊論文

【摘要】：基于原型邊坡設(shè)計(jì)了大型振動(dòng)臺(tái)模型試驗(yàn),通過(guò)監(jiān)測(cè)錨索軸力、樁身土壓力、坡體加速度和坡面位移時(shí)程,研究多級(jí)錨索框架梁與雙排抗滑樁組合結(jié)構(gòu)加固含軟弱夾層巖質(zhì)邊坡的地震動(dòng)力特性。試驗(yàn)結(jié)果表明:在0.15g El Centro地震波激振時(shí)錨索預(yù)應(yīng)力產(chǎn)生損失,最大損失比為23%,建議對(duì)變形等級(jí)要求較高的邊坡在錨索抗震設(shè)計(jì)時(shí)適當(dāng)提高預(yù)應(yīng)力初始值1.2~1.3倍;沿邊坡不同高度布置的錨索其軸力響應(yīng)峰值幾乎同一時(shí)刻到達(dá),而峰值增加比例呈現(xiàn)出空間非一致性,在錨索抗震設(shè)計(jì)時(shí)應(yīng)以坡體中部抗滑樁為界將邊坡分為上、下區(qū)分別考慮;坡腳抗滑樁受荷段、錨固段土壓力均隨著輸入地震波峰值加速度的增加而增大,主動(dòng)土壓力分布規(guī)律將由"上小下大"轉(zhuǎn)變成"上大下小"的形狀,被動(dòng)土壓力Ⅰ、Ⅱ區(qū)的分界點(diǎn)將向樁體下部發(fā)展;錨索與抗滑樁在地震時(shí)表現(xiàn)為協(xié)同工作機(jī)制,工程設(shè)計(jì)中要充分考慮地震效應(yīng)對(duì)樁錨下滑力分擔(dān)比的影響。該研究成果可為更加合理地考慮地震區(qū)錨索框架梁與抗滑樁組合支護(hù)結(jié)構(gòu)的設(shè)計(jì)提供指導(dǎo)。
[Abstract]:A large-scale shaking table model test was designed based on the prototype slope. Through monitoring the axial force of the anchor cable, the earth pressure of the pile, the acceleration of the slope body and the time history of the displacement of the slope, The seismic dynamic characteristics of multi-stage anchor cable frame beam combined with double-row anti-slide pile for strengthening rock slope with weak intercalation are studied. The experimental results show that the prestressing force of anchor cable is lost when the seismic wave is excited by 0.15 g El Centro. The maximum loss ratio is 23. It is suggested that the pre-stressed initial value should be increased by 1.2 to 1.3 times in the seismic design of Anchorage cable, and the peak value of axial force response of the anchor cable with different height of the slope should be reached almost at the same time. The proportion of peak value increase shows spatial inconsistency. In seismic design of Anchorage cable, the slope should be divided into upper and lower sections by taking the anti-slide pile in the middle of the slope as the boundary, and the bearing section of the anti-slide pile at the foot of the slope should be considered separately. The earth pressure in Anchorage section increases with the increase of the peak acceleration of the input seismic wave. The distribution of active earth pressure will change from "upper small to lower big" to "upper big and lower small". The boundary point of area 鈪，

本文編號(hào)：1602926