本文選題：驪山Ⅱ　切入點(diǎn)：區(qū)滑坡　出處：《西安科技大學(xué)》2017年碩士論文

【摘要】：滑坡前部深基坑開挖是滑坡治理工程的大忌,但這種做法屢見不鮮,災(zāi)害實(shí)例不勝枚舉,因此,開展滑坡前部基坑開挖對(duì)其產(chǎn)生的影響研究具有重要的理論與現(xiàn)實(shí)意義。以臨潼驪山Ⅱ區(qū)滑坡前部基坑開挖工程為研究背景,采用理論分析、現(xiàn)場(chǎng)監(jiān)測(cè)及數(shù)值模擬相結(jié)合的方法,分析不同開挖工況下滑坡體、抗滑樁及基坑圍護(hù)樁變形規(guī)律,以期揭示深基坑開挖的滑坡(支擋工程)響應(yīng),指導(dǎo)工程實(shí)踐,主要結(jié)果及結(jié)論如下:(1)、基于滑坡基本特征及其穩(wěn)定性理論計(jì)算成果,提出滑坡治理方案——“三級(jí)支擋+系統(tǒng)排水”及施工監(jiān)測(cè)方案——“多點(diǎn)監(jiān)測(cè)+跟蹤預(yù)報(bào)”,確保了深基坑工程順利、安全實(shí)施。(2)、進(jìn)行了現(xiàn)場(chǎng)監(jiān)測(cè)試驗(yàn)研究,得到了不同開挖工況下滑坡深部位移、圍護(hù)樁樁身變形曲線,抗滑樁、圍護(hù)樁后側(cè)沿樁身土壓力、鋼筋應(yīng)力變化曲線,及時(shí)分析,跟蹤預(yù)報(bào),指導(dǎo)了工程實(shí)踐。①滑坡深部位移曲線整體向背山側(cè)發(fā)生傾斜且在滑動(dòng)面處發(fā)生突變;②隨著基坑開挖深度的增加,C9圍護(hù)樁外側(cè)鋼筋應(yīng)力在不斷增大,在開挖面以上應(yīng)力先增大,隨后由于土體抵抗作用,在開挖面處開始減小,隨后繼續(xù)增大,再減小,曲線呈“雙峰型”;③B10抗滑樁隨著基坑開挖深度增加樁身外側(cè)鋼筋應(yīng)力在不斷增大,曲線在滑動(dòng)帶處變化較大;④C9、B10樁在不同開挖工況下土壓力所測(cè)值整體偏小,但在滑動(dòng)帶處變化明顯。(3)、運(yùn)用FLAC~(3D)軟件進(jìn)行滑坡治理前及治理后基坑開挖模擬,分析滑坡體、抗滑樁及圍護(hù)樁變形特征,模擬結(jié)果與實(shí)測(cè)變形特征基本一致,檢驗(yàn)了滑坡治理方案的有效性。
[Abstract]:The excavation of deep foundation pit in front of landslide is a big taboo of landslide treatment project, but this method is common and the disaster examples are numerous, so, It is of great theoretical and practical significance to study the influence of excavation on the front excavation of landslide. Taking the excavation of the front foundation pit of Lishan area in Lintong as the research background, the theoretical analysis is adopted. Based on the method of field monitoring and numerical simulation, the deformation law of landslide body, anti-slide pile and foundation pit retaining pile under different excavation conditions are analyzed in order to reveal the landslide (retaining engineering) response of deep foundation pit excavation and guide engineering practice. The main results and conclusions are as follows: (1) based on the basic characteristics of landslide and its stability theory, This paper puts forward the landslide control scheme, "drainage of three-stage supporting and retaining system", and the construction monitoring scheme, "multi-point monitoring, tracking and forecasting", which ensures the smooth and safe implementation of deep foundation pit engineering, and carries out field monitoring and experimental research. Under different excavation conditions, the deformation curve of the deep landslide, the deformation curve of the retaining pile body, the anti-slide pile, the change curve of the soil pressure and the stress of the reinforcement along the pile body are obtained, and the timely analysis and prediction are made. The results show that the slope of the deep displacement curve of the landslide is inclined to the back of the hill and the stress of reinforcing bar on the outside of the C9 retaining pile is increasing with the increase of the excavation depth of the foundation pit, and the stress above the excavating surface first increases. Then, due to the soil resistance, the stress of reinforcing bar outside the pile body increases with the increase of excavation depth, and then increases, and then decreases. The curve is "double peak" type of anti-slide pile with the depth of excavation increasing, and the stress of reinforcing bar on the outside of the pile body is increasing with the increase of excavation depth. The curve varies greatly in the sliding zone. The measured value of earth pressure of pile 4C9B10 under different excavation conditions is on the whole small, but the change is obvious in the sliding zone. The excavation simulation of foundation pit before and after the landslide treatment is carried out by using the software of FLACC9B10, and the landslide body is analyzed, by using the software of FLAC9B10, which is used to simulate the excavation of the foundation pit before and after the landslide treatment. The deformation characteristics of the anti-slide pile and the retaining pile are basically consistent with the measured deformation characteristics, and the effectiveness of the landslide treatment scheme is tested.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P642.22;TU753

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