花岗岩残积土路基填筑技术研究
发布时间：2018-10-10 19:53
【摘要】：花岗岩残积土是指花岗岩经风化后未被搬运而残留于原地的碎屑物质组成的土体,主要由石英、长石、方解石等粗颗粒矿物和高岭土为主的粘性土矿物组成。其原岩结构完全被破坏,可用手剥下及手指捻碎,过去我国一直将其作为粘性土来看待。但由于其云母含量高,结构松散,水稳性差,粘结力小,碾压成型困难,因此在公路中的应用受到限制。通平高速公路1标至7标(K1+000-K42+500)分布着大量的花岗岩残积土,若采用弃土借方的方案,无论从经济还是环保角度来说都不可取,为保证通平高速公路花岗岩残积土路基的稳定性和耐久性,本文通过对花岗岩残积土进行室内试验、现场碾压试验、弯沉检测和沉降观测,系统的研究了花岗岩残积土路基填筑技术。取得的主要成果如下：(1)通过室内土工试验,全面了解了通平高速花岗岩残积土的工程性质；根据花岗岩残积土的工程性质及填筑路基的不同部位,提出了不同的处理方法；根据试验路段填料性能的研究,得出花岗岩残积土的压实控制标准。(2)研究了水泥改良土的加固机理；通过试验研究表明,水泥能够明显改善花岗岩残积土的物理性质和力学性质；根据改良土的7天浸水抗压强度来确定水泥掺量,提出了路基不同部位的改良土抗压强度要求和水泥掺量,并提出不同路段的水泥改良土的施工方案。(3)研究花岗岩残积土的压实机理,通过试验路段的修筑,提出了花岗岩残积土填筑路基的最佳碾压工艺。(4)通过弯沉检测和沉降观测数据可知花岗岩残积土填筑的路基稳定性比较好。
[Abstract]:Granite residual soil refers to the soil composed of clastic material which is not transported after weathering and remains in situ. It is mainly composed of coarse granular minerals such as quartz feldspar calcite and clay minerals dominated by kaolin. The original rock structure is completely destroyed, which can be stripped off by hand and broken by fingers, which has been regarded as clay in China in the past. However, its application in highway is limited because of its high content of mica, loose structure, poor water stability, low adhesion and difficult compaction. In Tongping Expressway (K1 000-K42 500), there is a large amount of granite residual soil distributed in K1 000-K42 500, so it is not advisable to adopt the scheme of abandoned soil debit, either from an economic or an environmental point of view. In order to ensure the stability and durability of granite residual soil subgrade of Tongping Expressway, this paper carries out laboratory test, field rolling test, deflection detection and settlement observation of granite residual soil. The filling technology of granite residual soil subgrade is studied systematically. The main achievements are as follows: (1) through the laboratory geotechnical tests, the engineering properties of Tongping high speed granite residual soil are fully understood, and different treatment methods are put forward according to the engineering properties of granite residual soil and different parts of embankment. According to the research of filling performance of test section, the compaction control standard of granite residual soil is obtained. (2) the reinforcement mechanism of cement modified soil is studied, and the experimental results show that, Cement can obviously improve the physical and mechanical properties of granite residual soil, determine the cement content according to the 7 days soaking compressive strength of the improved soil, and put forward the compressive strength requirements and cement content of the improved soil in different parts of the roadbed. And put forward the construction plan of cement improved soil in different sections. (3) study the compaction mechanism of granite residual soil, through the construction of test section, The best compaction technology for subgrade filling with granite residual soil is put forward. (4) the stability of embankment filled with granite residual soil is better than that of granite residual soil by means of deflection detection and settlement observation data.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
，
本文编号：2263045
[Abstract]:Granite residual soil refers to the soil composed of clastic material which is not transported after weathering and remains in situ. It is mainly composed of coarse granular minerals such as quartz feldspar calcite and clay minerals dominated by kaolin. The original rock structure is completely destroyed, which can be stripped off by hand and broken by fingers, which has been regarded as clay in China in the past. However, its application in highway is limited because of its high content of mica, loose structure, poor water stability, low adhesion and difficult compaction. In Tongping Expressway (K1 000-K42 500), there is a large amount of granite residual soil distributed in K1 000-K42 500, so it is not advisable to adopt the scheme of abandoned soil debit, either from an economic or an environmental point of view. In order to ensure the stability and durability of granite residual soil subgrade of Tongping Expressway, this paper carries out laboratory test, field rolling test, deflection detection and settlement observation of granite residual soil. The filling technology of granite residual soil subgrade is studied systematically. The main achievements are as follows: (1) through the laboratory geotechnical tests, the engineering properties of Tongping high speed granite residual soil are fully understood, and different treatment methods are put forward according to the engineering properties of granite residual soil and different parts of embankment. According to the research of filling performance of test section, the compaction control standard of granite residual soil is obtained. (2) the reinforcement mechanism of cement modified soil is studied, and the experimental results show that, Cement can obviously improve the physical and mechanical properties of granite residual soil, determine the cement content according to the 7 days soaking compressive strength of the improved soil, and put forward the compressive strength requirements and cement content of the improved soil in different parts of the roadbed. And put forward the construction plan of cement improved soil in different sections. (3) study the compaction mechanism of granite residual soil, through the construction of test section, The best compaction technology for subgrade filling with granite residual soil is put forward. (4) the stability of embankment filled with granite residual soil is better than that of granite residual soil by means of deflection detection and settlement observation data.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
，
本文编号：2263045
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