【摘要】：隨著城市建設(shè)的發(fā)展,基坑工程越來(lái)越多�；又ёo(hù)結(jié)構(gòu)通常作為臨時(shí)性結(jié)構(gòu),相比永久性結(jié)構(gòu),安全儲(chǔ)備較小,而基坑工程一般位于城市,周邊有各種建筑物、管線、道路等,一旦失事就會(huì)造成生命財(cái)產(chǎn)的重大損失。因此保證基坑開挖的安全,避免工程事故尤為重要。本文以東莞市敘�；ㄔ坊又ёo(hù)工程為背景,結(jié)合基坑開挖的施工過(guò)程,先通過(guò)理正深基坑設(shè)計(jì)軟件計(jì)算了每種工況下的內(nèi)力并根據(jù)內(nèi)力值進(jìn)行配筋計(jì)算,對(duì)基坑還進(jìn)行了整體穩(wěn)定性驗(yàn)算、抗傾覆穩(wěn)定性驗(yàn)算和抗隆起驗(yàn)算。又基于GeoStudio有限元軟件的三個(gè)模塊進(jìn)行研究:首先,利用SIGMA/W模塊對(duì)敘福花苑基坑的施工過(guò)程進(jìn)行模擬,分析了基坑與支護(hù)結(jié)構(gòu)在分步開挖過(guò)程中的變形特性和土體的應(yīng)力應(yīng)變特征。其次,利用QUAKE/W模塊分析了本基坑在水平地震作用下的動(dòng)力響應(yīng),從坡頂?shù)綐兜自O(shè)置11個(gè)歷史記錄點(diǎn),分析其位移、速度、加速度的變化規(guī)律。最后,利用SLOPE/W模塊計(jì)算了開挖過(guò)程中的安全系數(shù),探討了土體c、?值的影響,又用擬靜力法計(jì)算了開挖后的基坑在水平地震(6度設(shè)防烈度)下的安全系數(shù),分析了土釘長(zhǎng)度變化對(duì)安全系數(shù)的影響,最后考慮動(dòng)應(yīng)力的影響,得到了基坑的安全系數(shù)時(shí)程曲線。通過(guò)基坑施工過(guò)程的數(shù)值模擬,發(fā)現(xiàn)支護(hù)樁的水平位移曲線呈“兩頭小,中間大”的形狀,朝基坑內(nèi)側(cè)移動(dòng),錨索平均每增加50kN的鎖定力,樁頂?shù)乃轿灰萍s減小1.5mm,在實(shí)際工程中,應(yīng)根據(jù)所要求的位移控制值來(lái)選擇合適的鎖定力。通過(guò)分析土體的應(yīng)力應(yīng)變,發(fā)現(xiàn)基坑角部和樁底附近的土體容易進(jìn)入塑性狀態(tài)。為減小塑性區(qū)的范圍,降低安全隱患,做同類型的支護(hù)設(shè)計(jì)時(shí),要保證支護(hù)樁有足夠的入土深度,施工時(shí)要注意被動(dòng)區(qū)土體的加固與監(jiān)測(cè)。通過(guò)理正的驗(yàn)算與有限元軟件安全系數(shù)的分析可知,工程設(shè)計(jì)是滿足使用要求的。本文的分析模擬過(guò)程與結(jié)果也為同類型工程問(wèn)題的合理設(shè)計(jì)提供了一定的參考。
[Abstract]:With the development of urban construction, foundation pit engineering is more and more. The foundation pit support structure is usually used as a temporary structure, compared with the permanent structure, the safety reserve is smaller, while the foundation pit works are generally located in the city, there are a variety of buildings, pipelines, roads and so on, once the accident will cause great loss of life and property. Therefore, it is very important to ensure the safety of excavation and avoid engineering accidents. Based on the foundation pit support project of Xufuhuayuan in Dongguan city and the construction process of the excavation, the internal force under each working condition is calculated by the design software of Lizheng deep foundation pit and the reinforcement is calculated according to the internal force value. The whole stability check calculation, the anti-overturning stability check calculation and the anti-uplift check calculation are also carried out for the foundation pit. Three modules of finite element software based on GeoStudio are studied. Firstly, the construction process of Xufuhuayuan foundation pit is simulated by using SIGMA/W module. The deformation characteristics of foundation pit and support structure and the stress-strain characteristics of soil are analyzed. Secondly, the dynamic response of the foundation pit under horizontal earthquake is analyzed by using QUAKE/W module. Eleven historical record points are set up from the top of the slope to the bottom of the pile to analyze the variation law of displacement, velocity and acceleration. Finally, the safety factor during excavation is calculated by using SLOPE/W module. By using the pseudostatic method, the safety factor of the excavated foundation pit under the horizontal earthquake (6 degree fortification intensity) is calculated, and the influence of the change of soil nail length on the safety factor is analyzed. Finally, the influence of dynamic stress is considered. The time history curve of safety factor of foundation pit is obtained. Through the numerical simulation of foundation pit construction process, it is found that the horizontal displacement curve of the supporting pile is in the shape of "two small ends with a large middle", moving towards the inside of the foundation pit, and the anchor cable increases the locking force of 50kN on average. The horizontal displacement of the pile top is reduced by about 1.5 mm. In practical engineering, the appropriate locking force should be selected according to the required displacement control value. By analyzing the stress and strain of soil, it is found that the soil around the corner of foundation pit and pile bottom is easy to enter into plastic state. In order to reduce the scope of plastic zone and reduce the hidden danger of safety, it is necessary to ensure that the supporting pile has enough depth in the design of the same type of support, and pay attention to the reinforcement and monitoring of the soil in the passive zone during construction. Through checking calculation and analyzing safety factor of finite element software, it can be seen that the engineering design meets the requirement of application. The simulation process and results in this paper also provide a reference for the reasonable design of the same type of engineering problems.
【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU470

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