【摘要】：全風(fēng)化花崗巖廣泛分布于我國南方地區(qū),在高速公路修建過程中將不可避免的穿越全風(fēng)化花崗巖區(qū)域。然而,全風(fēng)化花崗巖具有云母含量高、結(jié)構(gòu)松散、水穩(wěn)性差、粘結(jié)力小等工程特點(diǎn),往往導(dǎo)致路基壓實(shí)度低、彎沉值過大,無法將其直接用于高速公路路堤填筑。而對全風(fēng)化花崗巖路段直接棄方借土處理,從經(jīng)濟(jì)、環(huán)保等都將付出較大的代價(jià)。因此,對全風(fēng)化花崗巖的基本特性以及路堤填筑技術(shù)和質(zhì)量控制進(jìn)行研究,具有非常重要的意義。本文以瀏醴高速公路為依托工程,開展全風(fēng)化花崗巖路堤填筑與質(zhì)量控制技術(shù)研究,主要內(nèi)容及研究成果包括：(1)通過對瀏醴高速公路沿線全風(fēng)化花崗巖的詳細(xì)調(diào)研,查明了全風(fēng)化花崗巖的分布情況。對全風(fēng)化花崗巖沿線路段所取土樣進(jìn)行大量的物理、力學(xué)特性試驗(yàn),總結(jié)了該路段全風(fēng)化花崗巖的工程性質(zhì),主要表現(xiàn)為級配不良,結(jié)構(gòu)松散,強(qiáng)度較低等不良工程性質(zhì),僅適合于下路堤93區(qū)的填筑施工。使用水泥與石灰分別對全風(fēng)化花崗巖填料進(jìn)行改良試驗(yàn),改良后填料基本物理、力學(xué)性質(zhì)變化情況進(jìn)行了分析,充分考慮經(jīng)濟(jì)和拌合均勻性等方面,選擇4%的水泥改良土和7%的石灰改良土應(yīng)用于實(shí)際施工。(2)分析了影響壓實(shí)效果的主要因素,結(jié)合現(xiàn)場的碾壓試驗(yàn),對比分析不同含水量、不同松鋪厚度和不同強(qiáng)振遍數(shù)下的壓實(shí)效果,得出在松鋪厚度為30cm的條件下,碾壓工況組合采用光輪靜壓1遍+弱振2遍+光輪強(qiáng)振3-5遍+靜壓1遍的情況下,可以達(dá)到最佳的壓實(shí)效果。提出了高含水量下的全風(fēng)化花崗巖段的利用原則。通過對碾壓數(shù)據(jù)的公式擬合,得出強(qiáng)振遍數(shù)和填料含水量、松鋪厚度、壓實(shí)度的非線性回歸關(guān)系式N=3.723w2.184h-1.363K24.538,可用于整個(gè)路段的施工控制,減少工程造價(jià)和施工工期。(3)根據(jù)瀏醴高速公路沿線全風(fēng)化花崗巖的實(shí)際情況,提出針對94、96區(qū)水泥、石灰改良以及換填3種處治方案,以現(xiàn)場碾壓試驗(yàn)所測得的壓實(shí)度和彎沉值對處治方案進(jìn)行可行性分析得出可行方案。同時(shí)對可行方案的各項(xiàng)影響因素指標(biāo)進(jìn)行優(yōu)劣分析,利用灰色關(guān)聯(lián)決策方法對處治方案進(jìn)行優(yōu)化選擇,找出每個(gè)合同段關(guān)聯(lián)度最大的處治方案,應(yīng)用于實(shí)際工程。
[Abstract]:All-weathered granite is widely distributed in the south of China, and it will inevitably traverse the whole weathered granite area in the process of highway construction. However, all-weathered granite has the characteristics of high mica content, loose structure, poor water stability and low adhesion force, which often lead to low compactness and excessive deflection value of roadbed, so it can not be directly used to fill highway embankment. The direct disposal of weathered granite section will pay a great price from economy, environmental protection and so on. Therefore, it is of great significance to study the basic characteristics of weathered granite, embankment filling technology and quality control. In this paper, based on the project of Liu Li Expressway, the research on the technology of fully weathered granite embankment filling and quality control is carried out. The main contents and achievements are as follows: (1) through the detailed investigation of all weathered granite along Liuli Expressway, The distribution of all-weathered granite is found out. A large number of physical and mechanical properties tests were carried out on the soil samples taken from the section along the completely weathered granite. The engineering properties of the fully weathered granite in this section were summarized, such as poor grading, loose structure, low strength and other adverse engineering properties. Suitable only for filling construction in area 93 of the lower embankment. Using cement and lime respectively to improve the completely weathered granite filler, the basic physics and mechanical properties of the modified granite filler were analyzed, taking fully into account the economy and mixing uniformity, etc. 4% cement-modified soil and 7% lime-modified soil were selected for practical construction. (2) the main factors affecting compaction effect were analyzed, and different water contents were compared and analyzed in combination with field rolling test. The compaction effect under different thickness of loose paving and different number of strong vibration is obtained. It is concluded that under the condition that the thickness of loose paving is 30cm, the combination of light wheel static pressure 1 time, weak vibration 2 times, light wheel strong vibration 3? 5 times static pressure 1 time, under the condition of loose paving thickness being 30cm, the combination of light wheel static pressure 1 time, weak vibration 2 times, light wheel strong vibration 3? Can achieve the best compaction effect. The utilization principle of fully weathered granite segment under high water content is put forward. By fitting the formula of roller compacting data, the nonlinear regression relations of strong vibration number, packing water content, loose paving thickness and compactness are obtained, which can be used in the construction control of the whole road section, and can be used in the construction control of the whole road section, and it can be used in the construction control of the whole road section. (3) according to the actual situation of all-weathered granite along Liuliu Expressway, three treatment schemes for cement, lime improvement and replacement filling in 94,96 area are put forward. According to the compactness and deflection value measured by the field rolling test, the feasibility of the treatment scheme is analyzed and the feasible scheme is obtained. At the same time, the influence factors index of the feasible scheme is analyzed, and the gray relational decision method is used to optimize the treatment scheme, and the treatment scheme with the largest correlation degree of each contract segment is found out, which is applied to the actual engineering.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1

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本文編號：2450728