本文選題：地下工程 + 預(yù)應(yīng)力錨索��； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：巖土錨固可使地下工程圍巖由荷載變?yōu)橹ёo(hù)結(jié)構(gòu)的一部分，最大限度地發(fā)揮圍巖自身承載能力，以較小的支護(hù)力維持洞室的穩(wěn)定。目前，，對(duì)于地下工程預(yù)應(yīng)力錨索支護(hù)，還沒有系統(tǒng)的設(shè)計(jì)理論和計(jì)算方法。 論文以地下工程預(yù)應(yīng)力錨索支護(hù)為背景，研究地下工程中預(yù)應(yīng)力錨索的錨固支護(hù)原理、設(shè)計(jì)理論、計(jì)算方法、關(guān)鍵設(shè)計(jì)參數(shù)的確定方法等，為地下洞室預(yù)應(yīng)力錨索設(shè)計(jì)提供科學(xué)的理論依據(jù)。論文主要研究?jī)?nèi)容如下： ①結(jié)合軟弱圍巖、大跨徑洞室、高地應(yīng)力圍巖的變形機(jī)理以及錨索主動(dòng)錨固支護(hù)設(shè)計(jì)的作用機(jī)理，論文主要從地下工程洞室圍巖的穩(wěn)定性以及圍巖的變形控制兩個(gè)角度出發(fā)，對(duì)洞室圍巖進(jìn)行了彈塑性分析。 ②基于軟弱破碎圍巖的彈塑性分析以及錨索的主動(dòng)錨固原理,研究分析了洞室圍巖的彈塑性變形、變形區(qū)域、群錨機(jī)理、主動(dòng)錨固的作用機(jī)理，為洞室圍巖的穩(wěn)定性分析評(píng)價(jià)、錨索的布置方法、錨索長(zhǎng)度確定、錨固間距確定等提供了理論依據(jù)。 ③提出了軟巖圍巖中錨索設(shè)計(jì)外荷載、錨索設(shè)計(jì)錨固力的確定方法�；趪鷰r的彈塑性分析，通過圍巖穩(wěn)定性判據(jù)可得出洞室所需支護(hù)力、通過工程類比經(jīng)驗(yàn)法可確定洞室圍巖的最大允許收斂值，進(jìn)而反算求得滿足洞室圍巖變形要求所需支護(hù)力，根據(jù)同時(shí)滿足圍巖穩(wěn)定性、圍巖變形控制要求的支護(hù)力作為錨索支護(hù)設(shè)計(jì)的外荷載。最后根據(jù)錨索主動(dòng)錨固條件下圍巖的變形影響深度應(yīng)大于圍巖松動(dòng)區(qū)厚度，確定錨索的錨固力大小是否設(shè)計(jì)合理；根據(jù)錨索錨固力是否滿足現(xiàn)有規(guī)范要求等條件，確定錨索的主要設(shè)計(jì)參數(shù)。 ④提出了地下工程中錨長(zhǎng)的確定方法。錨長(zhǎng)包含錨固段長(zhǎng)度、自由段長(zhǎng)度，其中錨索的錨固段長(zhǎng)度通過膠結(jié)材料與洞室圍巖的膠結(jié)強(qiáng)度、膠結(jié)材料與錨索筋材間的膠結(jié)強(qiáng)度、錨固段形式、安全系數(shù)、錨固體直徑以及圍巖地層力學(xué)性質(zhì)等因素來確定；錨索自由段長(zhǎng)度通過圍巖彈塑性應(yīng)力重分布特點(diǎn)、塑性區(qū)厚度、圍巖抗剪強(qiáng)度、圍巖構(gòu)造特點(diǎn)等因素來確定。 ⑤以烏鞘嶺隧道為例，介紹了高地應(yīng)力軟弱隧道采用預(yù)應(yīng)力錨索作為初期支護(hù)的方案設(shè)計(jì)方法。
[Abstract]:Rock and soil anchoring can change the surrounding rock of underground engineering from load to part of supporting structure, exert the bearing capacity of surrounding rock itself to the maximum extent, and maintain the stability of cavern with smaller supporting force. At present, there is no systematic design theory and calculation method for prestressed cable support in underground engineering. Based on the background of prestressed anchor cable support in underground engineering, this paper studies the principle, design theory, calculation method and determination method of key design parameters of prestressed anchor cable in underground engineering. It provides a scientific theoretical basis for the design of prestressed Anchorage cables in underground caverns. The main contents of this thesis are as follows: The main contents are as follows: 1. Combining with the deformation mechanism of soft surrounding rock, large span tunnel, high ground stress surrounding rock and the action mechanism of anchoring cable active anchor support design, this paper mainly starts from two angles: the stability of surrounding rock and the deformation control of surrounding rock in underground engineering. The elastoplastic analysis of surrounding rock of cavern is carried out. 2 based on the elastic-plastic analysis of weak and broken rock and the principle of active anchoring of anchor cable, the elastoplastic deformation, deformation region, group anchor mechanism and active anchoring mechanism of surrounding rock of cavern are studied and analyzed, which is the stability analysis and evaluation of surrounding rock of cavern. The method of cable arrangement, the determination of cable length and the determination of anchoring distance provide theoretical basis. (3) the method of determining the external load of anchor cable and the anchor force in soft rock is put forward. Based on the elastoplastic analysis of surrounding rock, the supporting force required by the surrounding rock stability criterion can be obtained, and the maximum allowable convergence value of surrounding rock can be determined by the engineering analogy experience method. Then the supporting force needed to meet the requirements of surrounding rock deformation of the cavern is obtained. According to the support force which meets the stability of surrounding rock and the control requirement of surrounding rock deformation, it is regarded as the external load of anchor cable support design. Finally, according to the influence depth of surrounding rock deformation under the condition of active anchoring of anchor cable should be greater than the thickness of loose zone of surrounding rock, it is determined whether the anchoring force of anchor cable is reasonable or not, according to whether the anchor force of anchor cable meets the requirements of existing code, and so on. Determine the main design parameters of the anchor cable. 4. The method of determining anchor length in underground engineering is put forward. The anchoring length includes the length of the anchoring section and the length of the free section, in which the length of the anchoring section of the anchor cable passes through the cementing strength of the cemented material and surrounding rock of the cavern, the cementation strength between the cementing material and the cable reinforcement, the form of the anchoring section, the safety factor, The length of free section of anchor cable is determined by the characteristics of elastic-plastic stress redistribution of surrounding rock, thickness of plastic zone, shear strength of surrounding rock, structural characteristics of surrounding rock, etc. 5 taking Wushaoling tunnel as an example, this paper introduces the scheme design method of using prestressed anchor cable as initial support for soft tunnel with high ground stress.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.7

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