【摘要】：在傳統(tǒng)微型樁頂部聯(lián)系梁上加設(shè)斜向預(yù)應(yīng)力錨索,構(gòu)成新型復(fù)合擋錨結(jié)構(gòu)的錨索微型樁。采用分級(jí)加載方式進(jìn)行雙排傳統(tǒng)微型樁和錨索微型樁加固土質(zhì)邊坡的室內(nèi)模型試驗(yàn),并結(jié)合相同條件的FLAC3D數(shù)值計(jì)算,對(duì)比分析錨索微型樁和傳統(tǒng)微型樁以及采用兩者加固后邊坡的變形和受力特征,進(jìn)而探討錨索微型樁的抗滑機(jī)理。結(jié)果表明:相比傳統(tǒng)微型樁,經(jīng)錨索微型樁加固后邊坡的變形和聯(lián)系梁的位移明顯減小;錨索微型樁周圍產(chǎn)生應(yīng)力集中區(qū),形成結(jié)構(gòu)—土體的復(fù)合骨架體系,阻滯了致滑應(yīng)力和變形沿滑坡方向的傳遞;預(yù)應(yīng)力錨索有效增強(qiáng)了微型樁結(jié)構(gòu)的側(cè)向剛度,結(jié)構(gòu)側(cè)向傾斜變形減小;微型樁的內(nèi)力和外力分布趨于均勻,有利于及時(shí)和充分地發(fā)揮樁體的力學(xué)性能;隨著堆載的逐級(jí)增加,微型樁結(jié)構(gòu)的變形過(guò)程分為小變形、大變形和極限破壞3個(gè)階段,對(duì)應(yīng)的樁—錨荷載分擔(dān)比呈先增大、后減小和再增大的變化規(guī)律,極限破壞階段的分擔(dān)比穩(wěn)定在1.3~1.5之間。
[Abstract]:Oblique prestressed anchor cable is added to the connection beam at the top of the traditional micro pile to form a new type of anchor cable micro pile with composite anchor structure. The laboratory model test of double row traditional micro pile and anchor cable micro pile is carried out in this paper. Combined with the FLAC3D numerical calculation under the same conditions, the deformation and stress characteristics of anchor cable micro pile and traditional micro pile, as well as the deformation and stress characteristics of the slope strengthened by the two methods are compared and analyzed, and then the anti-skid mechanism of anchor cable micro pile is discussed. The results show that compared with the traditional micro-pile, the deformation of the slope and the displacement of the connecting beam are obviously reduced, the stress concentration area around the anchor cable micro-pile is formed, and the composite skeleton system of structure-soil is formed, which blocks the transfer of sliding stress and deformation along the direction of landslide, and the prestressed anchor cable effectively enhances the lateral stiffness of the micro-pile structure and reduces the lateral inclined deformation of the structure. The distribution of internal force and external force of micro pile tends to be uniform, which is beneficial to give full play to the mechanical properties of pile body in time and fully. With the increase of stacking load step by step, the deformation process of micro pile structure can be divided into three stages: small deformation, large deformation and ultimate failure. The corresponding pile anchor load sharing ratio increases at first, then decreases and then increases, and the sharing ratio in ultimate failure stage is stable between 1.3 鈮，

本文編號(hào)：2509839