發(fā)布時(shí)間：2018-06-03 13:55

  本文選題：排水管道 + 破裂　； 參考：《廣東工業(yè)大學(xué)》2014年碩士論文

【摘要】：城鎮(zhèn)排水管道在運(yùn)行的過(guò)程中,常會(huì)由于各種原因造成管道破裂。這些破裂缺陷如何影響排水管道承載能力,是排水管道檢測(cè)和評(píng)估中要解決的問(wèn)題之一。目前國(guó)內(nèi)對(duì)排水管道破裂缺陷的研究比較有限,本文主要利用塑料管道作為模型試件,針對(duì)排水管道幾種典型破裂缺陷進(jìn)行實(shí)驗(yàn)和理論分析研究。 結(jié)合現(xiàn)行國(guó)家標(biāo)準(zhǔn)與實(shí)際工程中排水管道缺陷特征,制作一批有缺陷的塑料排水管道試件,并對(duì)試件進(jìn)行環(huán)剛度、抗壓強(qiáng)度、外壓破壞荷載值的測(cè)定。根據(jù)斷裂力學(xué)經(jīng)典理論,對(duì)所測(cè)的實(shí)驗(yàn)結(jié)果進(jìn)行理論分析,驗(yàn)證《城鎮(zhèn)排水管道檢測(cè)與評(píng)估技術(shù)規(guī)程》中對(duì)排水管道破裂等級(jí)的劃分以及分析不同破裂缺陷對(duì)塑料排水管道承載能力的影響。結(jié)果表明： (1)在塑料排水管道環(huán)向方向上,一個(gè)破裂的2級(jí)叉形缺陷與四個(gè)破裂1級(jí)叉形缺陷在承載能力上可以認(rèn)為是等效的,這與《城鎮(zhèn)排水管道檢測(cè)與評(píng)估技術(shù)規(guī)程》中的破裂缺陷打分標(biāo)準(zhǔn)一致；一個(gè)破裂的4級(jí)圓形缺陷與七個(gè)3級(jí)的圓形缺陷在承載能力上可以認(rèn)為是等效的,這與規(guī)范中的破裂缺陷打分標(biāo)準(zhǔn)存在較大的差距。 (2)對(duì)于塑料排水管道分叉型裂紋,裂紋角度在120度左右對(duì)管道的徑向承載能力影響最大,管道最危險(xiǎn)；主裂紋長(zhǎng)度越長(zhǎng),應(yīng)力強(qiáng)度因子越大,管道的徑向抗壓能力越差；次裂紋長(zhǎng)度越長(zhǎng),應(yīng)力強(qiáng)度因子越大,管道的徑向抗壓能力越差,但相比主裂紋,次裂紋對(duì)管道的徑向承載能力的影響較小。 (3)對(duì)于塑料排水管道平行裂紋,經(jīng)過(guò)研究發(fā)現(xiàn),裂紋的交錯(cuò)率對(duì)排水管道承載能力的影響受裂紋間距的干擾,兩條裂紋間距越大,交錯(cuò)的越多或兩條裂紋間距越小,交錯(cuò)的越少,試件的徑向承載能力越弱,結(jié)構(gòu)越危險(xiǎn)；平行裂紋間距越大,排水塑料管道的徑向承載能力越差,結(jié)構(gòu)越危險(xiǎn)；平行裂紋深度越大,排水塑料管道的徑向承載能力越差,結(jié)構(gòu)越危險(xiǎn)。 (4)在缺陷等級(jí)和缺陷個(gè)數(shù)都相同的情況下,缺陷位于管道側(cè)壁比缺陷位于管道頂部對(duì)管道破壞的影響更大；在缺陷等級(jí)和缺陷個(gè)數(shù)都相同的情況下,缺陷分布越均勻?qū)ΨQ,對(duì)管道的破壞影響越大；在缺陷尺寸相同的情況下,管道方形孔洞和圓形孔洞對(duì)塑料排水管道的危害性差別不大。
[Abstract]:In the course of operation of urban drainage pipes, they often break down due to various reasons. How these ruptured defects affect the carrying capacity of drainage pipes is one of the problems to be solved in the inspection and evaluation of drainage pipes. At present, the domestic research on rupture defects of drainage pipes is limited. In this paper, plastic pipes are mainly used as model specimens to carry out experimental and theoretical analysis on several typical rupture defects of drainage pipes. Combined with the current national standards and the characteristics of the defects of the drainage pipeline in the actual engineering, a batch of defective plastic drainage pipe specimens were made, and the ring stiffness, compressive strength and external pressure failure load value of the specimens were measured. According to the classical theory of fracture mechanics, the measured experimental results are theoretically analyzed. The paper verifies the classification of rupture grade of drainage pipe and analyzes the influence of different rupture defects on the carrying capacity of plastic drainage pipe in the Technical Specification for Detection and Evaluation of Urban drainage Pipeline. The results show that: 1) in the circumferential direction of plastic drainage pipes, one broken grade 2 fork defect and four rupture grade 1 fork shape defects can be considered as equivalent in carrying capacity, This is in accordance with the standard of rating for rupture defects in the Technical Code for the Detection and Evaluation of Urban drainage pipes; one broken circular defect of grade 4 and seven circular defects of class 3 are considered equivalent in carrying capacity. There is a big gap between this and the standard of scoring the broken defects in the code. (2) for the bifurcation crack of plastic drainage pipeline, the radial bearing capacity of the pipe is most affected by the crack angle about 120 degrees, the pipeline is the most dangerous, and the longer the main crack length, the greater the stress intensity factor, the worse the radial compressive capacity of the pipeline; The longer the secondary crack length, the greater the stress intensity factor and the worse the radial compression resistance of the pipeline, but the smaller the influence of the secondary crack on the radial bearing capacity of the pipeline is compared with the main crack. 3) for the parallel cracks of plastic drainage pipes, it is found that the influence of the staggered rate of cracks on the bearing capacity of the drainage pipes is affected by the crack spacing. The larger the distance between the two cracks, the more the interlaced or the smaller the distance between the two cracks. The less the interlaced, the weaker the radial bearing capacity of the specimen and the more dangerous the structure; the greater the distance between the parallel cracks, the worse the radial bearing capacity of the drainage plastic pipe, the more dangerous the structure, and the greater the depth of the parallel crack. The worse the radial bearing capacity of the drainage plastic pipe, the more dangerous the structure. In the case of the same defect grade and number of defects, the defect on the side wall of the pipeline has more influence on the pipeline failure than the defect on the top of the pipe, and when the defect grade and the number of defects are the same, the more uniform the defect distribution is, the more symmetrical the defect distribution is. When the size of defects is the same, the harm of square and circular holes to plastic drainage pipeline is not different.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU992.23

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