本文關(guān)鍵詞：加筋路堤穩(wěn)定性分析軟件開發(fā)與應(yīng)用　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 加筋路堤 穩(wěn)定性分析 沉降量 ANSYS軟件

【摘要】：路堤加筋技術(shù)是一項(xiàng)重大的技術(shù)革新。與路堤土體相比,筋材具有較高的抗拉強(qiáng)度。加筋后,路堤的穩(wěn)定性和抵抗變形的能力得到了很大程度的提高。加筋法不僅減少了路堤的不均勻沉降,而且有利于路堤中集中應(yīng)力的擴(kuò)散,對提高工程質(zhì)量,節(jié)約工程用地,減少工程成本意義重大。本文論述了加筋土的作用機(jī)理,對筋材拔出和拉斷破壞時(shí)加筋土結(jié)構(gòu)的受力特性進(jìn)行了分析。討論了加筋路堤的失效原因,主要包括路基壓實(shí)度不夠、荷載不均勻、路堤填料質(zhì)量差、地基軟弱等幾個(gè)方面。將加筋路堤的破壞方式分為三大類,包括路堤失穩(wěn)、筋材破壞和地基破壞。研究了加筋路堤穩(wěn)定性分析方法,通過實(shí)例對總應(yīng)力法、有效固結(jié)應(yīng)力法、準(zhǔn)畢肖普法和改進(jìn)后的通用條分法進(jìn)行了對比。采用準(zhǔn)畢肖普法得到的路堤安全系數(shù)大于總應(yīng)力法和固結(jié)應(yīng)力法的計(jì)算結(jié)果。這是因?yàn)?與總應(yīng)力法和固結(jié)應(yīng)力法相比,準(zhǔn)畢肖普法考慮了土條間力的相互作用,結(jié)果更接近于實(shí)際值。與總應(yīng)力法相比,采用有效固結(jié)應(yīng)力法計(jì)算路堤的安全系數(shù)時(shí),將地基土由于固結(jié)作用產(chǎn)生的強(qiáng)度增量整合到土條的抗剪強(qiáng)度中,因此所得到的抗滑力較總應(yīng)力法大�；赩isual Basic.NET平臺開發(fā)了加筋路堤穩(wěn)定性分析軟件。該軟件與ANSYS提供的APDL語言連接,通過輸入的界面參數(shù)自動(dòng)生成ANSYS命令流,并將命令流自動(dòng)導(dǎo)入ANSYS軟件,進(jìn)行有限元分析。通過工程實(shí)例驗(yàn)證了該軟件的實(shí)用性,并分析了加筋對路堤穩(wěn)定性的影響�？偨Y(jié)得到加筋可以減小路堤的沉降量和側(cè)向位移值,但是作用效果不明顯。加筋能夠有效的提高路堤的穩(wěn)定性安全系數(shù),隨著路堤填高的不斷增加,這種效果逐漸減弱。
[Abstract]:Embankment reinforcement technology is a major technical innovation. Compared with embankment soil, reinforced material has higher tensile strength. The stability of embankment and the ability of resisting deformation have been greatly improved. The reinforcement method not only reduces the uneven settlement of embankment, but also is conducive to the diffusion of concentrated stress in embankment and to the improvement of engineering quality. It is of great significance to save engineering land and reduce project cost. This paper discusses the action mechanism of reinforced soil. The mechanical characteristics of reinforced earth structure under pull-out and tensile failure are analyzed, and the failure reasons of reinforced embankment are discussed, including insufficient compaction of embankment, uneven load and poor quality of embankment filler. The failure modes of reinforced embankment are divided into three categories, including embankment instability, reinforced material failure and foundation failure. The method of stability analysis of reinforced embankment is studied, and the total stress method is given through examples. The effective consolidation stress method, quasi-Bishop method and improved general strip method are compared. The safety factor of embankment obtained by quasi-Bishop method is greater than that of total stress method and consolidation stress method. Compared with the total stress method and the consolidation stress method, the quasi-Bishop method takes into account the interaction between soil strips and the result is closer to the actual value. Compared with the total stress method, the effective consolidation stress method is used to calculate the safety factor of embankment. The strength increment of foundation soil due to consolidation is integrated into the shear strength of soil strip. Therefore, the anti-slip force obtained is higher than that obtained by the total stress method. The software of stability analysis of reinforced embankment is developed on Basic.NET platform, which is connected with APDL language provided by ANSYS. The ANSYS command stream is automatically generated by the input interface parameters, and the command stream is automatically imported into the ANSYS software for finite element analysis. The practicability of the software is verified by an engineering example. The influence of reinforcement on the stability of embankment is analyzed. It is concluded that reinforcement can reduce the settlement and lateral displacement of embankment, but the effect is not obvious. The reinforcement can effectively improve the stability safety factor of embankment. With the increasing of embankment filling, this effect is gradually weakened.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.12

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