【摘要】：結(jié)合某黃土斜坡橋梁樁基工程,對(duì)同一坡度相近位置的兩根樁基開展現(xiàn)場(chǎng)試驗(yàn),研究其在不同豎向荷載工況下的樁身上、下坡面兩側(cè)的軸力、樁側(cè)摩阻力及樁側(cè)土壓力的傳遞規(guī)律與分布特征。試驗(yàn)表明:樁基荷載傳遞具有明顯的區(qū)域性,第1區(qū)域是從樁頂至約3倍樁徑深度處,此區(qū)域上坡面樁側(cè)軸力較下坡面相應(yīng)位置小,且其軸力隨深度遞減幅度及側(cè)摩阻力發(fā)揮程度均較下坡面樁側(cè)大;第2區(qū)域是從約3倍樁徑至10倍樁徑深度處,樁身上坡面一側(cè)豎向受力減小幅度小于樁基下坡面一側(cè),但此時(shí)下坡面樁側(cè)摩阻力發(fā)揮幅度大于樁基上坡面一側(cè);第3區(qū)域是從約10倍樁徑直至樁端,該區(qū)樁身兩側(cè)軸力差異不大,摩阻力發(fā)揮幅度相近,荷載平衡協(xié)調(diào)且向下傳遞穩(wěn)定。針對(duì)斜坡橋梁樁基上、下坡面兩側(cè)所受土壓力的不均勻性,對(duì)設(shè)計(jì)樁基豎向承載力進(jìn)行了一定程度地折減,并對(duì)計(jì)算公式作了相應(yīng)修正,研究結(jié)論可供類似工程參考、借鑒。
[Abstract]:Combined with a loess slope bridge pile foundation engineering, field tests were carried out on two piles with the same slope, and the axial forces on both sides of the slope were studied under different vertical load conditions. The transfer law and distribution characteristics of pile side friction resistance and pile side earth pressure. The test results show that the load transfer of pile foundation is obviously regional, the first area is from the top of pile to about 3 times the depth of pile diameter, and the lateral axial force of pile on the slope is smaller than that on the lower slope. The axial force decreases with depth and the exertion degree of side friction is larger than that of downhill pile side, the second area is from about 3 times pile diameter to 10 times pile diameter depth, the vertical force of one side of pile body is smaller than that of pile foundation slope side. But at this time, the range of friction on the side of the downhill pile is greater than that on the slope of the pile foundation, and the third area is from about 10 times the pile to the end of the pile, the axial force on both sides of the pile body in this area is not different, and the range of friction is similar. The load balance is balanced and the transfer down is stable. In view of the uneven earth pressure on both sides of the slope bridge pile foundation, the vertical bearing capacity of the designed pile foundation is reduced to a certain extent, and the calculation formula is revised accordingly. The research conclusions can be used for reference in similar projects.
【作者單位】： 同濟(jì)大學(xué)地下建筑與工程系;同濟(jì)大學(xué)巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室;廈門大學(xué)土木工程系;
【基金】：交通部西部交通建設(shè)科技項(xiàng)目(No.2009318812004) 國(guó)家自然科學(xué)基金項(xiàng)目(No.51209180,No.40872179) 中國(guó)博士后科學(xué)基金(No.2012M510137)
【分類號(hào)】：U443.15
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本文編號(hào)：2151090