【摘要】：在基坑支護(hù)工程中樁錨支護(hù)結(jié)構(gòu)以其獨(dú)特的優(yōu)勢得到了廣泛應(yīng)用，但工程事故偶有發(fā)生，對其設(shè)計與施工中的關(guān)鍵技術(shù)問題進(jìn)行研究顯得十分必要。 本文以北京凱萊大酒店深基坑工程為背景，分析了目前常用的深基坑支護(hù)形式，根據(jù)本工程特點(diǎn)（基礎(chǔ)輪廓、埋深等）、土層性質(zhì)（土層工程性質(zhì)及水文條件）、周邊環(huán)境（擬建建筑與周邊建筑物、道路、地下管線的位置關(guān)系等）及使用要求（結(jié)構(gòu)施工期間用地及堆載要求等），對該基坑進(jìn)行了支護(hù)設(shè)計優(yōu)選和受力變形的穩(wěn)定性分析。對護(hù)坡樁施工過程中出現(xiàn)的塌孔現(xiàn)象進(jìn)行了深入的研究分析，論證了長螺旋鉆機(jī)壓注水泥漿成孔倒插鋼筋籠法在本工程的適用性。提出了在北京地區(qū)砂卵石地層中設(shè)置止水帷幕的理念。利用FLAC3D對土體應(yīng)力和位移、護(hù)坡樁樁身彎矩和位移、錨索軸力的分布和發(fā)展規(guī)律進(jìn)行了數(shù)值模擬分析，并利用TFL-S-NMxx振弦式混凝土應(yīng)變計對護(hù)坡樁樁體內(nèi)力進(jìn)行了現(xiàn)場監(jiān)測。數(shù)值模擬和現(xiàn)場實(shí)測表明：支護(hù)結(jié)構(gòu)受力遠(yuǎn)小于其承載能力，水平位移小于報警值，，有較大的安全儲備。
[Abstract]:The pile-anchor support structure has been widely used in foundation pit support engineering because of its unique advantages, but accidents occasionally occur, so it is very necessary to study the key technical problems in its design and construction. Based on the deep foundation pit project of Kelai Hotel in Beijing, this paper analyzes the common supporting forms of deep foundation pit, according to the characteristics of the project (foundation outline, Soil properties (soil engineering properties and hydrological conditions), surrounding environment (proposed building and surrounding buildings, roads, etc.), The optimum selection of supporting design and the stability analysis of stress and deformation of the foundation pit are carried out based on the location relation of underground pipeline and the requirements for use of land and load during the construction of the structure. In this paper, the phenomenon of hole collapse in the construction of slope protection pile is studied and analyzed in depth, and the applicability of the method of inverting the reinforcement cage into the hole of the long screw drilling machine is proved. The idea of setting up a waterproof curtain in the sand and gravel strata in Beijing area is put forward. The stress and displacement of soil, the bending moment and displacement of pile body and the distribution and development of axial force of anchor cable are numerically simulated and analyzed by FLAC3D, and the internal force of slope protection pile is monitored by TFL-S-NMxx vibrating chord concrete strain gauge. Numerical simulation and field measurement show that the bearing capacity of the supporting structure is much less than its bearing capacity, the horizontal displacement is less than the alarm value, and there is a large safety reserve.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)（北京）
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU753

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