高聚物注浆人工堆石料的力学特性研究.doc

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摘要

     随着我国的高速公路、隧道建设，以及水库慢慢老化，很多类似工程都亟需经济、有效并且环保的维护方法，注浆技术就是其中的一种。原有的注浆技术存在基层质量不过关，压实度不足、松散或者空洞等现象，使得维护效果不好，并且耗费人力财力，施工时间也比较漫长，对建筑工程的正常使用影响很大。高聚物注浆技术不仅可以加强破坏区域的牢固性，而且施工时间短，对日常行车造成的影响不大，同时高聚物注浆技术使用的材料比较环保，不会对环境造成污染，而且可以在很大程度上节省道路维修的支出，很有应用前景。本文作者在阅读总结前人研究成果的基础上，对高聚物注浆技术的形成和发展进行深入研究，在室内通过自行制备黑白料配比、高聚物与人工堆石料质量比不同的试验试样，利用应变控制式三轴仪，从应力应变关系和剪切强度等方面进行分析，研究高聚物注浆人工堆石料中高聚物含量和高聚物黑白料配比对试样剪切强度、延性、内摩擦角和粘聚力的影响规律。本文的研究工作主要集中在一下几个方面：

1.相同的围压下，质量比越高的试样，表现出更高的抗剪性能，并且具有相对较好的延性，说明高聚物含量的适度增加可以改善堆石料的抗剪性能。

2.相同的质量比下，黑料的含量相对含量越高，强度增长的越高，同时因为试样有硬化的现象，所以试样的延性变差了，与之相反的是，白料的相对含量提高，使得强度反而有小幅度的下降，但是延性明显改良，因为白料增多使得试样软化。强度的变化均可以从内摩擦力和粘聚力的方面来进行解释。

3.高聚物注浆人工堆石料压缩强度随围压的增加而增大，存在明显的平缓段和压密段，围压为100 kPa、200 kPa时，应力应变关系曲线现状均相似，属于应变硬化型，过了曲线的平直段后，随轴向应变的增加，竖直应力也会增加，当然随着围压的增大，竖直应力的增加也越明显，同时应变硬化特征越明显。

4.黏聚力虽然有波动但是随着黑白料配比和质量比的变大总趋势是变大的，两者之间呈指数函数变化。内摩擦角随着黑白料配比的变大则表现出了十分明显的线性变化，但是质量比的改变对其影响不大。

关键词：聚氨酯；人工堆石料；质量比；黑白料配比

 

ABSTRACT

With Chinese construction of highway and tunnel, and the slowly aging of reservoir, a lot of similar projects are in urgent need of economic, effective and environmentally friendly maintenance methods. Grouting technique is one of them. The existing grouting technique has phenomena of the poor quality of the basic level, the insufficient degree of compaction, loose or empty and so on, which make a poor maintenance effect. At the same time, huge human resources and long construction time make great impact on the normal use of building construction. Polymer injection technology can not only strengthen the fastness of the broken region, but also has a short construction time, which makes little influence on daily traffic. In the meantime polymer injection technology used in the material which is more environmentally friendly, and will not pollute the environment and cut the expense on road maintenance, so it has a promising future. Based on the summary of previous studies, the author of this paper does deep research on the formation and development of polymer grouting technology. Making test samples differ in the mass ratio of polymer and artificial rockfill and the ratio of black and white material on my own. Under a certain confining pressure step, using strain controlled three axis meter to do the experiment. Analysing in the aspects of stress-strain relationship and shear strength, etc. Studying which effect law the mass ratio of polymer and artificial rockfill and the ratio of black and white material put on the shear strength, ductility, internal friction angle and cohesive force. The main research work of this paper is focused on following several aspects:

1.Making test samples differ in the mass ratio of polymer and artificial rockfill and the ratio of black and white material on my own and setting conditions on the mass ratio of polymer and artificial rockfill, the ratio of black and white material and the time of disassembly. Making good control of every samples’ mass.

2.Setting the ratio of black and white material on 1: 1 and changing the mass ratio of polymer and artificial rockfill to set up control group. Under a stable confining pressure, the motor lifts the sample slowly and makes it compressed.  Recording vertical axis of the sample displacement and ring readings within their means, and observe the deformation of the sample. When the peak intensity appears or vertical axial displacement reaches a height of 20% of the sample, the test ends. Then changing the confining pressure, do the next set of tests. Fixing the mass ratio of polymer and artificial rockfillthe on 1:1 and changing the ratio of black and white material on 1: 1 to set up control group. Repeating the steps.

3.Processing obtained data and drawing stress-strain curve and strength envelope, Analysing results from two aspects of the stress-strain relationship and shear strength , the mass ratio and the ratio of black and white material impact on the sample, and try to explain experimental phenomena from internal friction and stick cohesion.

4.Analysis of confining pressure on the strength of the sample, which can be also called lateral impact on the sample. By changing the description of the slope and curvature of the curve for the stress analysis of hardening or softening stress. And try to explain a sample test conclusions from the interaction between the particles inside.

Key words: polyurethane; artificial rockfill; mass ratio; ratio of black and white materials