本文選題：TRD工法 + 深基坑��； 參考：《河南工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著城市規(guī)模的不斷擴(kuò)大和城市土地供應(yīng)的限制,高層建筑已隨處可見(jiàn),地鐵、管廊建設(shè)日益增多,隨之出現(xiàn)的深基坑工程也越來(lái)越多。TRD工法作為一種新型的水泥土攪拌連續(xù)墻施工工法,通過(guò)研究發(fā)現(xiàn),該工法具有止水性好、深度方向均勻等特點(diǎn),在黃河沖積平原地區(qū)具有很好的應(yīng)用前景。本課題以黃河沖積平原某深基坑工程為例,對(duì)工程分別采用TRD工法與鉆孔灌注樁進(jìn)行計(jì)算,對(duì)比分析其受力特性。之后對(duì)TRD工法圍護(hù)墻體采用不同嵌固深度、墻體厚度及支錨剛度的受力變形進(jìn)行研究。最后,利用ABAQUS軟件對(duì)該基坑工程進(jìn)行了模擬開(kāi)挖,研究土體、墻體及鋼支撐的受力及位移特性。本文的主要研究結(jié)論如下:(1)TRD工法支護(hù)墻體具有止水性好、墻體深度方向均勻、設(shè)備安全等特點(diǎn)。(2)以黃河沖積平原地區(qū)某深工程基坑為例,使用該工法進(jìn)行設(shè)計(jì)計(jì)算,結(jié)果表明,TRD工法墻體有很高的支護(hù)、擋土效果,開(kāi)挖完成后其支護(hù)結(jié)構(gòu)的水平位移要比鉆孔灌注樁小2.87mm,計(jì)算出的沉降量比鉆孔灌注樁小3mm。(3)在滿足嵌固深度基本要求的前提下,適當(dāng)增加墻體嵌固深度可有效降低土體沉降量,但超過(guò)一定限值時(shí),減低土體的沉降效果會(huì)減弱;保持TRD工法中型鋼參數(shù)不變,適量改變TRD工法墻體厚度,發(fā)現(xiàn)作用于圍護(hù)墻體的彎矩、剪力主要由型鋼承擔(dān);適當(dāng)調(diào)整支錨剛度的大小可有效降低圍護(hù)墻體的最大彎矩和最大剪力,也可有效的降低基坑周圍土體的地表沉降。(4)運(yùn)用數(shù)值模擬方法對(duì)某深基坑工程進(jìn)行模擬分析,研究不同工況下開(kāi)挖的成效,發(fā)現(xiàn)隨著基坑向下不斷開(kāi)挖,其地表沉降在4mm左右波動(dòng),周圍土體沉降主要發(fā)生在墻體最大深度以上至土體表面區(qū)域;TRD工法支護(hù)墻體最大水平位移發(fā)生在距離坑底較近部位;鋼支撐最大應(yīng)力值發(fā)生在鋼支撐中間段,而隨著與圍護(hù)結(jié)構(gòu)側(cè)壁間距的減小,應(yīng)力也逐漸降低。
[Abstract]:With the continuous expansion of urban scale and the restriction of urban land supply, high-rise buildings have been found everywhere, and the construction of subway and pipe corridors is increasing day by day. There are more and more deep foundation pit engineering. TRD method is a new construction method of cement soil mixing continuous wall. Through the research, it is found that the method has the characteristics of good water sealing and uniform depth direction. It has a good application prospect in the Yellow River alluvial plain area. Taking a deep foundation pit project in the Yellow River alluvial plain as an example, the TRD method and bored pile are used to calculate the engineering, and the stress characteristics are compared and analyzed. Then the deformation of TRD retaining wall with different embedded depth, wall thickness and anchor stiffness is studied. Finally, the excavation of the foundation pit is simulated by using ABAQUS software, and the mechanical and displacement characteristics of soil, wall and steel braces are studied. The main conclusions of this paper are as follows: (1) the wall supporting wall with TRD method has the characteristics of good water sealing, uniform depth direction and safety of equipment, etc.) taking a deep engineering foundation pit in the Yellow River alluvial plain area as an example, the method is used to design and calculate. The results show that the wall with TRD method has high retaining effect. The horizontal displacement of the retaining structure is 2.87 mm smaller than that of bored pile after excavation, and the calculated settlement is 3 mm. Properly increasing the embedded depth of the wall can effectively reduce the settlement of the soil, but when the value exceeds a certain limit, the effect of reducing the settlement of the soil will be weakened, while keeping the parameters of the profile steel in the TRD method unchanged and changing the thickness of the wall of the TRD method in moderation, It is found that the shear force is mainly borne by the section steel, and the maximum bending moment and the maximum shear force of the retaining wall can be effectively reduced by adjusting the stiffness of the supporting anchor. It can also effectively reduce the surface settlement of soil around the foundation pit.) numerical simulation method is used to simulate and analyze a deep foundation pit project, and the results of excavation under different working conditions are studied. It is found that the excavation continues with the excavation down. The surface settlement fluctuates around 4mm, and the settlement of surrounding soil occurs mainly from the maximum depth of the wall to the area of soil surface. The maximum horizontal displacement of the wall is near to the bottom of the pit. The maximum stress value of steel bracing occurs in the middle of steel bracing, and the stress decreases gradually with the decrease of side wall spacing between steel braces and enclosure structures.
【學(xué)位授予單位】：河南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU753

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