【摘要】：深基坑土體的開(kāi)挖,改變了周?chē)馏w的受力狀態(tài),坑底及側(cè)壁的土體發(fā)生位移。這些變形可能最終導(dǎo)致臨近建筑物發(fā)生被動(dòng)的變形,從而影響其正常使用,甚至破壞。根據(jù)石家莊某一空間尺寸的深基坑,初步選擇樁錨索支護(hù)結(jié)構(gòu);采用有限差分法分析基坑支護(hù)體系與周?chē)ㄖ锏南嗷ビ绊?在此基礎(chǔ)上對(duì)基坑進(jìn)行分區(qū)支護(hù)設(shè)計(jì)。(1)對(duì)基坑坡壁外側(cè)沒(méi)有建筑物情況進(jìn)行數(shù)值模擬,分析坡壁土體水平位移及沉降,結(jié)果表明:離90度平面陰角端部,0.22倍坡壁長(zhǎng)度或2.8倍基坑深度范圍內(nèi),坡壁土體變形明顯受到另一條坡壁的約束;而其它范圍坡壁的變形受到的空間效應(yīng)很小,可以按照平面應(yīng)變理論進(jìn)行分析。(2)平面為矩形、長(zhǎng)邊平行于基坑坡壁的建筑物,在緊鄰坡壁的中間位置時(shí),隨著其基礎(chǔ)外側(cè)邊線離坡壁距離的增加,建筑物地基沉降、基坑坡壁變形逐漸減小。相對(duì)于沒(méi)有建筑物的情況,建筑物的存在增大了坡壁中間一定范圍土體的變形;當(dāng)基坑平面陰角為90度時(shí),該范圍是1.85倍坡壁方向建筑物的邊長(zhǎng),或0.57倍的坡壁邊長(zhǎng)。當(dāng)建筑物基礎(chǔ)外側(cè)邊線離坡壁距離大于1.5倍基坑深度時(shí),可以不考慮建筑物對(duì)坡壁變形、土體開(kāi)挖對(duì)建筑物的影響。(3)建筑物在坡壁靠近90度平面陰角時(shí),相對(duì)于無(wú)建筑物的情況,坡壁土體位移主要增大范圍是:離角部1.49倍坡壁方向建筑物邊長(zhǎng),或0.46倍坡壁長(zhǎng)度內(nèi)。建筑物在基坑坡壁角部,相對(duì)于坡壁中間位置的情況,坡壁水平位移及地表沉降的增加量要小。(4)根據(jù)周?chē)h(huán)境變形、坡壁穩(wěn)定的要求,對(duì)基坑進(jìn)行分區(qū)支護(hù)。當(dāng)建筑物在相對(duì)于東側(cè)坡壁的中間位置,且其基礎(chǔ)外側(cè)邊線離東側(cè)坡壁為0.5倍坑深時(shí),可以通過(guò)增加?xùn)|側(cè)坡壁中間、1.85倍坡壁方向建筑物邊長(zhǎng)范圍內(nèi)支護(hù)結(jié)構(gòu)的剛度,控制建筑物地基的沉降量、沉降差。憑借減弱西側(cè)坡壁空間效應(yīng)明顯的角部范圍支護(hù)剛度,能夠降低坡壁外側(cè)地下管線的差異變形。
[Abstract]:The excavation of deep foundation pit soil changes the stress state of surrounding soil and the displacement of soil in bottom and sidewall. These deformations may eventually lead to passive deformation of adjacent buildings, which may affect their normal use or even damage. According to a space size deep foundation pit in Shijiazhuang, the support structure of pile and anchor cable is preliminarily selected, and the interaction between supporting system of foundation pit and surrounding buildings is analyzed by finite difference method. On the basis of this, the zonal support design of foundation pit is carried out. (1) numerical simulation is carried out on the condition that there is no building outside the slope wall of the foundation pit, and the horizontal displacement and settlement of the slope wall soil are analyzed. The results show that the end of the negative angle is 90 degrees from the plane. In the range of 0.22 times the length of the slope wall or 2.8 times the depth of the foundation pit, the deformation of the slope wall soil is obviously constrained by another slope wall. However, the spatial effect on the deformation of other slope walls is very small, which can be analyzed according to the plane strain theory. (2) buildings with rectangular plane and long edges parallel to the slope wall of foundation pit are located in the middle of the slope wall. With the increase of the distance from the lateral side of the foundation to the slope wall, the foundation settlement of the building and the deformation of the foundation pit wall gradually decrease. Compared with the case of no building, the existence of the building increases the deformation of soil in a certain range in the middle of the slope wall, and when the plane angle of foundation pit is 90 degrees, the range is 1.85 times the side length of the building in the direction of the slope wall, or 0.57 times the side length of the slope wall. When the distance from the outside side of the building foundation to the slope wall is more than 1.5 times the depth of the foundation pit, the deformation of the slope wall and the influence of soil excavation on the building can be ignored. (3) when the slope wall is close to 90 degree plane negative angle, Compared with the case without building, the main increase range of the soil displacement of the slope wall is 1.49 times from the angle of the slope wall direction, or 0.46 times the length of the slope wall. Compared with the middle position of the slope wall, the increase of horizontal displacement and surface subsidence of the slope wall in the corner of the foundation pit wall is small. (4) according to the requirements of the surrounding environment and the stability of the slope wall, the foundation pit is supported by subdivision. When the building is in the middle position relative to the east slope wall, and the lateral side line of the foundation is 0.5 times deeper than the eastern slope wall, the stiffness of the support structure can be increased in the middle of the east slope wall and 1.85 times the length of the building side. Control the settlement of the building foundation, the settlement is poor. The differential deformation of the underground pipeline outside the slope wall can be reduced by reducing the angular range support stiffness of the west slope wall.
【學(xué)位授予單位】：河北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU753

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