復(fù)雜環(huán)境下某深厚軟土基坑的實測性狀研究
發(fā)布時間：2018-08-17 16:03
【摘要】：詳盡分析了杭州某上部帶有較厚硬殼層的深厚軟黏土地基中,開挖深度為17.4~19.8 m,采用地下連續(xù)墻和多層鋼筋混凝土支撐作為支護結(jié)構(gòu)的超深基坑工程的實測性狀�，F(xiàn)場監(jiān)測內(nèi)容包括基坑側(cè)壁土體水平位移、坑外地表沉降及內(nèi)支撐軸力。研究表明,本案例基坑的最大水平位移與基坑最大開挖深度之比hm m?/H介于0.24%~0.75%,最大水平位移超過100 mm,其中蠕變變形占總側(cè)向變形的比例高達44%~56%,基坑水平位移蠕變速率為0.15~0.76 mm/d,蠕變速率與基坑開挖深度和基底附近土層性質(zhì)有密切關(guān)系;"T"型地下連續(xù)墻和隔斷墻技術(shù)對減小側(cè)壁土體變形有一定作用�；涌油鈾M向地面沉降大致呈拋物線分布,坑外縱向沉降大致呈馬鞍形,地表周圍土體最大沉降與基坑最大開挖深度之比vm m?/H介于0.26%~0.7%,最大沉降量與坑壁最大側(cè)向位移量的關(guān)系大致為vmax hmax???~hmax2.57?,沉降蠕變速率為0.1~0.6 mm/d。隨著開挖及相鄰支撐的澆筑及拆除,多層支撐支護結(jié)構(gòu)中各層支撐的軸力不斷變化。
[Abstract]:In this paper, a deep soft clay foundation with a thick hard shell layer in the upper part of Hangzhou is analyzed in detail. The excavation depth is 17.4 ~ 19.8 m.The underground continuous wall and multi-story reinforced concrete brace are used as the support structure for the measured behavior of ultra-deep foundation pit engineering. Field monitoring includes horizontal displacement of lateral soil, surface settlement and axial force of inner support. Research shows that In this case, the ratio of the maximum horizontal displacement to the maximum excavation depth of the foundation pit is between 0.24 mm and 0.75 mm, and the maximum horizontal displacement is more than 100 mm, in which the proportion of creep deformation to total lateral deformation is as high as 44 / 56.The creep rate of horizontal displacement of foundation pit is 0.150.76 mm / d, compacted with vermicelli. The rate of variation is closely related to the excavation depth of foundation pit and the properties of soil layer near the foundation, and the technology of "T" type underground continuous wall and partition wall plays a certain role in reducing the deformation of lateral wall soil. The lateral ground settlement outside the pit is approximately parabola distribution, and the longitudinal settlement outside the pit is approximately saddle-shaped. The ratio between the maximum settlement of soil around the surface and the maximum excavation depth of foundation pit is between 0.260.0.The relationship between the maximum settlement and the maximum lateral displacement of the pit wall is approximately 2.57g / h, and the creep rate of settlement is 0.1 ~ 0.6mm / d. With the excavation and the pouring and dismantling of adjacent braces, the axial forces of each layer of multi-layer bracing structure are constantly changing.
【作者單位】： 浙江大學濱海和城市巖土工程研究中心;浙江大學軟弱土與環(huán)境土工教育部重點實驗室;杭州運河集團投資發(fā)展有限公司;浙江省建筑設(shè)計研究院;
【基金】：國家自然科學基金項目(51278462) 浙江省建設(shè)廳科技推廣應(yīng)用研究項目
【分類號】：TU433
[Abstract]:In this paper, a deep soft clay foundation with a thick hard shell layer in the upper part of Hangzhou is analyzed in detail. The excavation depth is 17.4 ~ 19.8 m.The underground continuous wall and multi-story reinforced concrete brace are used as the support structure for the measured behavior of ultra-deep foundation pit engineering. Field monitoring includes horizontal displacement of lateral soil, surface settlement and axial force of inner support. Research shows that In this case, the ratio of the maximum horizontal displacement to the maximum excavation depth of the foundation pit is between 0.24 mm and 0.75 mm, and the maximum horizontal displacement is more than 100 mm, in which the proportion of creep deformation to total lateral deformation is as high as 44 / 56.The creep rate of horizontal displacement of foundation pit is 0.150.76 mm / d, compacted with vermicelli. The rate of variation is closely related to the excavation depth of foundation pit and the properties of soil layer near the foundation, and the technology of "T" type underground continuous wall and partition wall plays a certain role in reducing the deformation of lateral wall soil. The lateral ground settlement outside the pit is approximately parabola distribution, and the longitudinal settlement outside the pit is approximately saddle-shaped. The ratio between the maximum settlement of soil around the surface and the maximum excavation depth of foundation pit is between 0.260.0.The relationship between the maximum settlement and the maximum lateral displacement of the pit wall is approximately 2.57g / h, and the creep rate of settlement is 0.1 ~ 0.6mm / d. With the excavation and the pouring and dismantling of adjacent braces, the axial forces of each layer of multi-layer bracing structure are constantly changing.
【作者單位】： 浙江大學濱海和城市巖土工程研究中心;浙江大學軟弱土與環(huán)境土工教育部重點實驗室;杭州運河集團投資發(fā)展有限公司;浙江省建筑設(shè)計研究院;
【基金】：國家自然科學基金項目(51278462) 浙江省建設(shè)廳科技推廣應(yīng)用研究項目
【分類號】：TU433
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