發(fā)布時(shí)間：2018-04-28 00:07

  本文選題：基坑工程 + 環(huán)境影響��； 參考：《石家莊鐵道大學(xué)》2013年碩士論文

【摘要】：隨著經(jīng)濟(jì)的發(fā)展,城市的建設(shè),大型地下空間的開(kāi)發(fā)和利用成為必然。深大基坑數(shù)量越來(lái)越多,由于施工環(huán)境復(fù)雜,不確定性因素多,加上人們認(rèn)識(shí)程度和方法的欠缺,引發(fā)了不少基坑事故,造成周?chē)ㄖ锏膬A倒或管線的破壞,影響了人們的正常生活和結(jié)構(gòu)的正常使用。為此,如何盡可能的減小深基坑工程施工中的事故發(fā)生率以及災(zāi)害損失,己經(jīng)成為了一個(gè)迫切需要解決的問(wèn)題。風(fēng)險(xiǎn)分析理論為此提供一條可行的途徑。 本文采用不確定性理論對(duì)系統(tǒng)進(jìn)行風(fēng)險(xiǎn)分析。首先,對(duì)不確定性理論進(jìn)行了闡述,由于巖土體是一種不確定系統(tǒng),基坑工程中存在著主觀和客觀上的不確定性,文中對(duì)基坑工程中不確定性的來(lái)源和具體不確定性因素進(jìn)行分析。其次,建立基于D-S證據(jù)理論的基坑及周?chē)h(huán)境風(fēng)險(xiǎn)評(píng)估體系,分別建立了基坑、建筑物、管線的風(fēng)險(xiǎn)評(píng)估指標(biāo),綜合前人的研究成果,確定了基坑、建筑物、管線的變形控制標(biāo)準(zhǔn),運(yùn)用D-S證據(jù)理論將數(shù)值模擬結(jié)果和專(zhuān)家評(píng)估結(jié)論進(jìn)行融合,可以得到基坑和周?chē)h(huán)境系統(tǒng)的風(fēng)險(xiǎn)等級(jí),并通過(guò)工程實(shí)例驗(yàn)證了方法的可行性。針對(duì)基坑工程中“水”這一影響工程安全性的關(guān)鍵因素,建立了基于模糊事故樹(shù)方法的基坑防排水系統(tǒng)的風(fēng)險(xiǎn)評(píng)估體系,從止水、排水、降水三個(gè)方面建立了基坑工程防排水事故樹(shù),引入三角模糊數(shù),計(jì)算系統(tǒng)模糊失效概率和基本事件的模糊重要度,通過(guò)工程實(shí)例驗(yàn)證了方法有效性,評(píng)估結(jié)論可為工程實(shí)踐提供指導(dǎo)。最后,結(jié)合風(fēng)險(xiǎn)評(píng)估過(guò)程中基坑工程存在的風(fēng)險(xiǎn)及以往基坑事故的總結(jié)分析,從勘察、設(shè)計(jì)、施工三個(gè)方面對(duì)工程中存在的問(wèn)題進(jìn)行總結(jié),提出改進(jìn)措施,以控制和降低系統(tǒng)風(fēng)險(xiǎn)。
[Abstract]:With the development of economy, the construction of cities, the development and utilization of large underground space is inevitable. The number of deep foundation pit is more and more. Because of the complex construction environment, many uncertain factors, and the lack of people's knowledge and methods, many foundation pit accidents have been caused, and the dumping of surrounding buildings or the destruction of pipelines has affected people. Therefore, how to reduce the accident rate and disaster loss in the construction of deep foundation pit has become an urgent problem to be solved as far as possible. The theory of risk analysis provides a feasible way to solve this problem.
In this paper, the uncertainty theory is used to carry out the risk analysis of the system. First, the theory of uncertainty is expounded. Because rock and soil is an uncertain system, there is a subjective and objective uncertainty in the foundation pit engineering. The source of uncertainty in the foundation pit and the specific uncertainty factors are analyzed in this paper. Secondly, the establishment of the uncertainty of the foundation pit is established. Based on the risk assessment system of foundation pit and surrounding environment based on D-S evidence theory, the risk assessment indexes of foundation pit, building and pipeline are set up respectively. The deformation control standards of foundation pit, building and pipeline are determined by combining the previous research results, and the basis of D-S evidence theory is used to fuse the numerical simulation results and expert evaluation conclusions, and the basis can be obtained. The risk grade of the pit and surrounding environment system is tested and the feasibility of the method is verified through an engineering example. In view of the key factors affecting the safety of "water" in foundation pit engineering, a risk assessment system of foundation pit prevention and drainage system based on Fuzzy accident tree method is established, and the foundation pit workers are established from three aspects of water stop, drainage and precipitation. A triangular fuzzy number is introduced to calculate the fuzzy failure probability of the system and the fuzzy importance of the basic events. The effectiveness of the method is verified by an engineering example. The evaluation conclusion can provide guidance for the engineering practice. Finally, the risk and the previous foundation pit accidents in the process of risk assessment are summarized and analyzed. Review, design and construction three aspects of the existing problems in the project, and propose improvement measures to control and reduce system risk.

【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU753

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本文編號(hào)：1812925