【摘要】：隨著我國(guó)經(jīng)濟(jì)建設(shè)的逐漸發(fā)展,邊坡失穩(wěn)問題在各種工程建設(shè)中大量出現(xiàn)。影響邊坡穩(wěn)定性的因素有很多,其中,抗剪強(qiáng)度參數(shù)及邊坡穩(wěn)定性分析方法對(duì)邊坡的穩(wěn)定性分析影響重大。因此,本文依托舟曲春長(zhǎng)南路東側(cè)高邊坡治理工程,對(duì)該工程不同地層進(jìn)行了現(xiàn)場(chǎng)原位剪切試驗(yàn),并在此基礎(chǔ)上用不同方法對(duì)該邊坡某一剖面進(jìn)行了穩(wěn)定性分析。 首先,在該工程區(qū)域內(nèi),選取了有代表性的試驗(yàn)地點(diǎn)進(jìn)行了兩組現(xiàn)場(chǎng)剪切試驗(yàn),一組為強(qiáng)風(fēng)化千枚巖,一組為礫石混合土。通過對(duì)試驗(yàn)結(jié)果進(jìn)行詳細(xì)分析,并與地勘報(bào)告所得結(jié)果及經(jīng)驗(yàn)取值進(jìn)行對(duì)比表明：不同方法獲取的抗剪強(qiáng)度參數(shù)相差較大,特別是粘聚力。其中,地勘報(bào)告結(jié)果主要依據(jù)為室內(nèi)試驗(yàn)結(jié)果,而工程經(jīng)驗(yàn)結(jié)果是對(duì)工程地質(zhì)條件相似的工程進(jìn)行類比所獲得的結(jié)果,其中現(xiàn)場(chǎng)剪切試驗(yàn)獲取的抗剪強(qiáng)度參數(shù)最大,這是因?yàn)槭覂?nèi)試驗(yàn)中,試件尺寸小,巖體完整性不能夠保持,試件相對(duì)破碎,降低了巖體抗剪強(qiáng)度參數(shù)；而不同工程地質(zhì)條件差別較大,依據(jù)經(jīng)驗(yàn)所得強(qiáng)度參數(shù)與實(shí)際也有很大差別。所以現(xiàn)場(chǎng)剪切試驗(yàn)結(jié)果更加準(zhǔn)確合理。 其次,依據(jù)前期現(xiàn)場(chǎng)剪切試驗(yàn)成果,以該邊坡工程為實(shí)例,分別利用有限元強(qiáng)度折減理論和極限平衡理論,用MIDAS/GTS和理正巖土軟件對(duì)強(qiáng)風(fēng)化千枚巖邊坡加固前后不同工況下(自然靜力、地震、降雨)的穩(wěn)定性進(jìn)行了對(duì)比分析,認(rèn)為邊坡在加固前處于欠穩(wěn)定狀態(tài),而加固后邊坡穩(wěn)定,說明該邊坡加固措施有效合理。對(duì)于此類強(qiáng)風(fēng)化千枚巖邊坡穩(wěn)定性分析的兩種方法中,有限元強(qiáng)度折減法能夠更好地考慮巖土體的物理力學(xué)性質(zhì)及巖土材料與支護(hù)結(jié)構(gòu)之間的相互作用,能更好的評(píng)價(jià)支護(hù)結(jié)構(gòu)的加固作用,而加固前兩種方法對(duì)邊坡的穩(wěn)定性分析差別不大。因此對(duì)于此類強(qiáng)風(fēng)化千枚巖邊坡加固后的穩(wěn)定性評(píng)價(jià)應(yīng)綜合兩種算法共同判別。 本文的結(jié)論可以在實(shí)際工程中得到參考應(yīng)用,對(duì)強(qiáng)風(fēng)化千枚巖及礫石混合土類邊坡的穩(wěn)定性分析及加固設(shè)計(jì)的抗剪強(qiáng)度參數(shù)取值提供一定的經(jīng)驗(yàn)基礎(chǔ),對(duì)強(qiáng)風(fēng)化千枚巖類邊坡加固效果評(píng)價(jià)方法的選取提供一定幫助。
[Abstract]:With the gradual development of economic construction in our country, the problem of slope instability appears in a large number of engineering construction. There are many factors affecting slope stability, among which shear strength parameters and slope stability analysis methods have great influence on slope stability analysis. Therefore, based on the high slope treatment project on the east side of Zhouqu Chunchang South Road, the in situ shear tests of different strata of the project are carried out in this paper, and on this basis, the stability analysis of a section of the slope is carried out by different methods. First of all, two groups of field shear tests were carried out in this project area, one was strongly weathered thousand quartzite and the other was gravel mixed soil. Through the detailed analysis of the test results and the comparison with the results and empirical values obtained from the geological prospecting report, it is shown that the shear strength parameters obtained by different methods are quite different, especially the cohesion. Among them, the results of geological prospecting report are mainly based on the results of laboratory test, and the results of engineering experience are the results obtained by analogy with similar engineering geological conditions, among which the shear strength parameters obtained by field shear test are the largest. This is because in the laboratory test, the size of the specimen is small, the integrity of the rock mass can not be maintained, and the specimen is relatively broken, which reduces the shear strength parameters of the rock mass. However, there are great differences in different engineering geological conditions, and the strength parameters obtained according to experience are also very different from those in practice. Therefore, the field shear test results are more accurate and reasonable. Secondly, according to the results of field shear test in the early stage, taking the slope engineering as an example, the finite element strength reduction theory and limit equilibrium theory are used respectively. The stability of strong weathered rock slope under different working conditions (natural static, earthquake, rainfall) before and after reinforcement is compared and analyzed by MIDAS/GTS and Rizheng geotechnical software. It is considered that the slope is in an unstable state before reinforcement. The stability of the slope after reinforcement shows that the reinforcement measures are effective and reasonable. Among the two methods of stability analysis of this kind of strongly weathered rock slope, the finite element strength reduction method can better consider the physical and mechanical properties of rock and soil and the interaction between geotechnical material and supporting structure. The reinforcement effect of the supporting structure can be better evaluated, but the stability analysis of the slope is not different between the two methods before reinforcement. Therefore, the stability evaluation of this kind of strongly weathered rock slope after reinforcement should be judged by two algorithms. The conclusion of this paper can be used as a reference in practical engineering, and provides a certain empirical basis for the stability analysis of strongly weathered thousand quartzite and gravel mixed soil slopes and the value of shear strength parameters in reinforcement design. It is helpful to select the evaluation method of reinforcement effect of strong weathered rock slope.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU413;TU43

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