本文選題：船閘 + 基坑開挖�。� 參考：《長沙理工大學(xué)》2015年碩士論文

【摘要】：近年來,隨著我國腹地經(jīng)濟(jì)和沿江產(chǎn)業(yè)的快速發(fā)展,內(nèi)河航運(yùn)升級的需求日益急迫。目前,國內(nèi)外主要采用梯級渠化與航道整治相結(jié)合的方式升級航道,在原有航運(yùn)樞紐基礎(chǔ)上擴(kuò)建高等級船閘是其中的方式之一。新建船閘閘址一般距離已建船閘較近,工程施工采用基坑臨時支護(hù)開挖的方式。鄰近船閘基坑開挖工程除具有基坑工程的一般特性外,還具有其自身明顯的特點(diǎn)。本文著力于鄰近船閘基坑開挖工程的特殊性及目前相關(guān)研究成果相對缺乏的現(xiàn)狀,采用土工模型試驗(yàn)及數(shù)值仿真計(jì)算相結(jié)合的研究手段,以某航運(yùn)樞紐衡重式閘室結(jié)構(gòu)段鄰近基坑開挖工程為背景,對坡樁聯(lián)合支護(hù)型式(簡稱坡樁支護(hù))基坑開挖過程中的支護(hù)效果、工作機(jī)理及相應(yīng)的影響因素展開了研究,并與常見的排樁支護(hù)型式進(jìn)行了比較,主要的研究成果及結(jié)論如下:(1)鄰近船閘基坑開挖分別采用坡樁支護(hù)和排樁支護(hù)時,基坑開挖完成時前者支護(hù)和鄰近閘墻頂端的水平位移值均小于后者,表明當(dāng)具備局部的放坡空間時,坡樁支護(hù)型式下鄰近衡重式船閘結(jié)構(gòu)基坑開挖的基坑支護(hù)效果要優(yōu)于排樁支護(hù)。(2)坡樁支護(hù)型式由于是根據(jù)鄰近船閘基坑工程的特點(diǎn),結(jié)合了放坡開挖和排樁支護(hù)兩種型式的優(yōu)點(diǎn)而成的一種聯(lián)合型的支護(hù),其中采用局部放坡開挖的方式可以縮短支護(hù)結(jié)構(gòu)的自由高度,增強(qiáng)支護(hù)結(jié)構(gòu)的嵌固強(qiáng)度,而采用豎直開挖加排樁支護(hù)的方式可以解決基坑與鄰近船閘之間距離不足的問題,從而形成了良好的基坑支護(hù)效果。(3)坡樁支護(hù)型式下基坑頂部放坡隨著放坡起點(diǎn)距離船閘頂端距離的增大,閘墻結(jié)構(gòu)向墻前傾斜的幅度隨之增大,且隨著距離的增大,影響效果逐漸減弱;隨著放坡坡度逐漸放緩,閘墻結(jié)構(gòu)向墻前傾斜的幅度相差不大。(4)基坑底部放坡開挖隨著放坡坡度逐漸放緩,斜坡土體對基坑產(chǎn)生的嵌固作用逐漸增強(qiáng),該開挖步內(nèi)支護(hù)和閘墻結(jié)構(gòu)由向坑內(nèi)(或墻后)發(fā)生傾斜逐漸轉(zhuǎn)為向坑外(或墻前)發(fā)生傾斜。(5)當(dāng)船閘處于不同運(yùn)行工況時,隨著船閘內(nèi)部水位的增大,支護(hù)和閘墻結(jié)構(gòu)向坑內(nèi)(或墻后)傾斜的幅度更大,表明船閘內(nèi)部水位越高對基坑開挖工程的安全穩(wěn)定越不利。
[Abstract]:In recent years, with the rapid development of the hinterland economy and industry along the Yangtze River, the demand of inland shipping upgrade is increasingly urgent. At present, at home and abroad, the combination of cascade canal and channel regulation is mainly used to upgrade the waterway, one of which is to expand the high-grade lock on the basis of the original shipping hub. The newly built lock site is generally close to the existing lock, and the temporary excavation of foundation pit is adopted in the engineering construction. In addition to the general characteristics of foundation pit engineering, the excavation engineering of adjacent lock also has its own obvious characteristics. This paper focuses on the particularity of excavation engineering of adjacent lock foundation pit and the relative lack of relative research results at present, and adopts the research means of combining geotechnical model test and numerical simulation calculation. Based on the excavation of the foundation pit adjacent to the structural section of the weighty sluice chamber of a shipping hub, the supporting effect, working mechanism and corresponding influencing factors during the excavation process of the slope pile combined support type (abbreviated as slope pile support) foundation pit are studied. The main research results and conclusions are as follows: (1) when excavation of foundation pit of adjacent lock adopts slope pile support and row pile support, When the excavation of foundation pit is completed, the horizontal displacement of the former support and the adjacent gate wall is smaller than that of the latter, which indicates that when there is local sloping space, Under the slope pile support type, the excavation effect of the foundation pit of the adjacent ship lock structure is better than that of the row pile support. 2) the slope pile support type is based on the characteristics of the foundation pit engineering of the adjacent ship lock. Combined with the advantages of two types of slope excavation and row pile support, a combined support is developed, in which the free height of the support structure can be shortened and the embedded strength of the support structure can be enhanced by using the method of partial slope excavation. The problem of insufficient distance between foundation pit and adjacent lock can be solved by vertical excavation plus row pile support. Thus, a good foundation pit support effect is formed. Under the slope pile support type, the slope at the top of the foundation pit increases with the distance from the starting point of the caving slope to the top of the lock, and the amplitude of the slanting of the gate wall structure to the front of the wall increases, and with the increase of the distance, The influence effect is gradually weakened, along with the slope of sloping slope gradually slowing down, the amplitude of slanting of sluice wall structure to the front of the wall is not different. 4) the slope excavation at the bottom of foundation pit gradually slows down, and the embedded effect of slope soil on the foundation pit increases gradually. The excavation step support and the structure of sluice wall are inclined gradually from inside (or behind the wall) to outside (or in front of the wall). When the lock is in different operating conditions, with the increase of the water level inside the lock, The slope of support and sluice wall structure to the pit (or behind the wall) is larger, which indicates that the higher the water level in the lock is, the less safe and stable the excavation works are.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U641

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