【摘要】：土工結(jié)構(gòu)的震害調(diào)查表明,樁板墻具備優(yōu)良的抗震性能,安裝錨索之后效果更佳。盡管如此,目前關(guān)于樁板墻的研究大多數(shù)集中于靜力方面,對(duì)于動(dòng)力響應(yīng)情況和抗震工作機(jī)制的研究較少,關(guān)于兩類典型樁板墻,即樁板墻和錨索樁板墻的地震響應(yīng)特性的對(duì)比研究未見報(bào)道�；诖�,將樁板墻和錨索樁板墻進(jìn)行了同臺(tái)的大型振動(dòng)臺(tái)模型試驗(yàn),對(duì)比分析了兩種結(jié)構(gòu)的地震響應(yīng)特性。試驗(yàn)結(jié)果表明:兩種結(jié)構(gòu)的土壓力、錨索拉力和樁身位移地震時(shí)程響應(yīng)規(guī)律均與輸入的地震動(dòng)參數(shù)密切相關(guān),如曲線形狀和變化趨勢,并且它們的峰值出現(xiàn)時(shí)刻與地震動(dòng)加速度峰值出現(xiàn)時(shí)刻基本一致。錨索的安裝,能更好地保持邊坡的穩(wěn)定性和有效限制樁身變形,尤其是在高地震烈度區(qū),當(dāng)土體非線性增強(qiáng)時(shí),優(yōu)勢體現(xiàn)愈發(fā)明顯,即預(yù)應(yīng)力錨索會(huì)產(chǎn)生減小樁身位移的效果,特別是當(dāng)?shù)卣鹣禂?shù)為0.4時(shí),普通樁板墻的位移達(dá)到預(yù)應(yīng)力錨索樁板墻的2.4倍。此外,錨索拉力的施加,能夠使樁對(duì)土體產(chǎn)生"主動(dòng)"的反壓力,兩種結(jié)構(gòu)在靜力和地震系數(shù)為0.1的工況下樁背所受的滑坡推力基本一致,嵌固段土體抗力的差距也不明顯,實(shí)測點(diǎn)強(qiáng)度的最大差異不超過20%,說明錨索的作用沒有得到充分發(fā)揮;但當(dāng)?shù)卣鹣禂?shù)大于等于0.2后,錨索作用開始體現(xiàn),樁土變形的協(xié)調(diào)性更好,樁背與滑體的相互作用力增大,土體抗力較樁板墻大幅度減小,更有利于邊坡的穩(wěn)定。同時(shí),錨索拉力的作用使結(jié)構(gòu)的懸臂段樁身內(nèi)力較大,在進(jìn)行結(jié)構(gòu)設(shè)計(jì)時(shí),相比于普通樁板墻,錨索樁板墻應(yīng)加強(qiáng)懸臂段,可以適當(dāng)弱化嵌固段。分析成果可供高烈度地震區(qū)樁板墻的抗震設(shè)計(jì)、災(zāi)后恢復(fù)重建及今后相關(guān)規(guī)范修訂參考。
[Abstract]:The seismic damage investigation of geotechnical structure shows that the pile-slab wall has good seismic performance, and the effect is better after the anchor cable is installed. However, at present, most of the researches on pile-slab wall are focused on static force, but there are few researches on dynamic response and seismic mechanism, about two kinds of typical pile-slab wall, There is no report on the seismic response characteristics of pile-slab wall and cable-anchored pile-slab wall. Based on this, the large shaking table model tests of pile plate wall and anchor cable pile plate wall are carried out, and the seismic response characteristics of the two structures are compared and analyzed. The experimental results show that the earth pressure, cable tension and displacement of pile are closely related to the input parameters of ground motion, such as curve shape and variation trend. And their peak appearance time is basically consistent with the peak time of ground motion acceleration. The installation of anchor cable can better maintain the stability of slope and effectively limit the deformation of pile body, especially in the area of high seismic intensity, when the soil is nonlinear, the superiority is more obvious, that is, the prestressed anchor cable will produce the effect of reducing the displacement of pile body. Especially when the seismic coefficient is 0.4, the displacement of common pile-slab wall is 2.4 times of that of prestressed anchor cable pile-slab wall. In addition, the application of anchor cable force can cause the pile to produce "active" back pressure on soil, and the landslide thrust of the two structures is basically the same under the condition of static force and earthquake coefficient of 0.1. The difference of soil resistance is not obvious, the maximum difference of measured point strength is not more than 20, which shows that the role of anchor cable has not been given full play. However, when the seismic coefficient is greater than 0.2, the effect of anchor cable begins to manifest, the deformation of pile and soil is more harmonious, the interaction force between pile back and sliding body increases, and the soil resistance is greatly reduced than that of pile and slab wall, which is more favorable to the stability of slope. At the same time, the effect of cable tension makes the internal force of the cantilever of the structure larger. In the design of the structure, compared with the ordinary pile-plate wall, the anchor-cable pile-plate wall should strengthen the cantilever segment and weaken the fixed segment properly. The results can be used as reference for seismic design, post-disaster recovery and reconstruction of pile-slab wall in high intensity earthquake area and revision of relevant codes in the future.
【作者單位】： 西南石油大學(xué)地球科學(xué)與技術(shù)學(xué)院;西南交通大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(No.41602332) 安全生產(chǎn)重大事故防治關(guān)鍵技術(shù)科技項(xiàng)目(No.2014_3189) 四川省教育廳項(xiàng)目(No.14ZB0056)~~
【分類號(hào)】：TU435

【相似文獻(xiàn)】

相關(guān)期刊論文 前2條

1 雷丹;謝健鶴;;樁板墻在萬州某滑坡體整治工程中的應(yīng)用[J];路基工程;2014年03期

2 ;[J];;年期

，

本文編號(hào)：2372818