本文選題：旋噴錨索 + 基坑��； 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：錨固技術(shù)廣泛應(yīng)用于巖土邊坡加固、建筑基坑支護(hù)、地下工程等中,旋噴錨索是近年來(lái)發(fā)展起來(lái)的一種較新的錨固技術(shù)工藝。相對(duì)于普通錨索,旋噴錨索承載力高、單位長(zhǎng)度錨固力大、適用于更廣的土層、施工過(guò)程中質(zhì)量更容易保證,具有其相對(duì)優(yōu)勢(shì)。但對(duì)其研究相對(duì)較少,表現(xiàn)出理論研究落后于工程實(shí)踐的現(xiàn)狀。本文主要工作如下:(1)選取合適的剪切-滑移模型,對(duì)等截面與變截面旋噴錨索的荷載傳遞機(jī)理及力學(xué)性狀影響因素進(jìn)行分析;此外,推導(dǎo)并提出規(guī)范提供的錨索剛度公式的不合理性,建立并驗(yàn)證旋噴錨索剛度公式并對(duì)其影響因素進(jìn)行分析。(2)通過(guò)錨索現(xiàn)場(chǎng)拉拔試驗(yàn),得到旋噴錨索的極限粘結(jié)強(qiáng)度標(biāo)準(zhǔn)值、單位長(zhǎng)度錨固力、界面抗剪剛度系數(shù)、錨索剛度及峰值抗剪強(qiáng)度等參數(shù),分析了塑性位移發(fā)展規(guī)律,驗(yàn)證了錨索拉拔荷載-位移公式的合理性,并對(duì)普通錨索與旋噴錨索的剛度進(jìn)行對(duì)比,說(shuō)明旋噴錨索并未具有剛度方面的優(yōu)勢(shì)。(3)采用現(xiàn)行基坑支護(hù)規(guī)范方法,結(jié)合工程實(shí)際,對(duì)旋噴錨索與普通錨索分別用于在基坑支護(hù)體系中的作用和效果進(jìn)行對(duì)比設(shè)計(jì),說(shuō)明旋噴錨索的優(yōu)勢(shì),同時(shí),對(duì)旋噴錨索分別采用規(guī)范剛度公式及本文建立的剛度公式進(jìn)行支護(hù)體系對(duì)比設(shè)計(jì),說(shuō)明對(duì)支護(hù)效果的差異性影響。(4)采用有限元數(shù)值分析方法,研究錨索直徑、水泥土模量、預(yù)應(yīng)力及預(yù)應(yīng)力分配對(duì)支護(hù)效果的影響。
[Abstract]:Anchorage technology is widely used in geotechnical slope reinforcement, foundation pit support, underground engineering, etc. In recent years, jet anchor cable is a relatively new Anchorage technology developed in recent years. Compared with the common anchor cable, the screw jet anchor cable has high bearing capacity and large anchoring force per unit length, which is suitable for the wider soil layer, and the quality in the construction process is easier to guarantee and has its relative advantages. But its research is relatively few, showing that the theoretical research lags behind the status quo of engineering practice. The main work of this paper is as follows: (1) selecting appropriate shear-slip model to analyze the load transfer mechanism and the influence factors of mechanical properties of the equal-section and variable-cross-section spout Anchorage cables. This paper deduces and puts forward the irrationality of the formula of anchor cable stiffness provided by the code, establishes and verifies the formula of anchor cable stiffness and analyzes its influencing factors. 2) through the field drawing test of anchor cable, the standard value of ultimate bond strength of screw jet anchor cable is obtained. The parameters such as unit length anchoring force, interface shear stiffness coefficient, anchor cable stiffness and peak shear strength are analyzed. The development law of plastic displacement is analyzed, and the rationality of the load-displacement formula of anchor cable drawing is verified. By comparing the stiffness of the common anchor cable and the rotary shotcrete anchor cable, it is shown that the rotary shotcreting anchor cable does not have the advantage of stiffness. (3) the existing foundation pit support standard method is adopted and combined with the engineering practice. The function and effect of rotating shotcreting anchor cable and common anchor cable in foundation pit supporting system are compared and designed, which shows the advantages of rotary shotcreting anchor cable, at the same time, The standard stiffness formula and the stiffness formula established in this paper are used for the comparative design of the supporting system, which shows that the difference influence on the support effect is analyzed by finite element numerical analysis method, and the diameter of anchor cable and the modulus of cement soil are studied. The influence of prestress and prestress distribution on support effect.
【學(xué)位授予單位】：西安建筑科技大學(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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