文献类型：期刊文献

中文题名：混凝土静态破碎剂膨胀性能及其破碎孔径优化

英文题名：Optimization Analysis on the Crushing Hole Diameter of Concrete Based on the Expansion Performance of Soundless Cracking Agent

作者：钟振[1,2];杨熙华[1,2];顾杨圣[3];娄荣[4];夏才初[1,5];包春燕[1,2]

机构：[1]绍兴文理学院土木工程学院,浙江绍兴312000;[2]绍兴文理学院岩石力学与地质灾害实验中心,浙江绍兴312000;[3]绍兴市交通投资集团有限公司,浙江绍兴312000;[4]华汇工程设计集团股份有限公司,浙江绍兴312000;[5]同济大学地下建筑与工程系,上海200092

年份：2021

卷号：43

期号：4

起止页码：56

中文期刊名：三峡大学学报：自然科学版

收录：CSTPCD

基金：浙江省公益技术应用国际科技合作领域项目(LGJ20E090001)。

语种：中文

中文关键词：静态破碎技术;膨胀压;混凝土;扩展有限元法;最优孔径

外文关键词：soundless cracking technique;expansive pressure;concrete;extended finite element method;optimal hole diameter

中文摘要：静态破碎剂的碎碎能力与其膨胀性能密切相关.为最大限度发挥静态破碎剂的膨胀性能,从静态破碎剂的膨胀试验出发,探索优化的水剂比和拌合水温,以及相应条件下不同孔径可以产生的最大膨胀力.在此基础上,通过ABAQUS软件建立含不同直径破碎孔的混凝土模型(150 mm×150 mm×150 mm),提出应用扩展有限元法(Extended Finite Element Method)开展混凝土静态破碎过程的数值分析,并采用能量释放率理论进一步分析最优孔径下混凝土裂纹的扩展过程,结果表明:最大膨胀压随内径的增大近似呈线性增长,当破碎孔直径达到26 mm,静态破碎剂产生的最大膨胀压足以使混凝土贯通破碎;静态破碎过程可分为3个阶段,第1阶段为无裂纹阶段(p<2.58 MPa),第2阶段为裂纹萌生、扩展阶段(2.58 MPa≤p<11.28 MPa),第3阶段为裂纹贯通阶段(p≥11.28 MPa).

外文摘要：The crushing performance of the soundless cracking agent(SCA) is highly related to its expansion capability. In order to maximize the expansion capability of the SCA. Firstly, the expansion tests of SCA were conducted to determine the suitable reaction conditions, such as water-agent ratio and water temperature. Then the expansive pressure tests were performed to measure the maximum expansion pressures that SCA can generate for different hole diameters at preferred reaction conditions. Thereafter, the concrete block model(150 mm×150 mm×150 mm) with holes of different diameters in the center was built by using ABAQUS, and the Extended Finite Element Method(XFEM) was applied to simulate the static crushing process of the model. Moreover, the cracking process of the concrete block under the optimal pore size was analyzed by using the energy release rate theory. The results show that the maximum expansion pressure tends to increases linearly with a growth in inner diameter of the hole, and the concrete block can be effectively crushed under a crushing hole of 26 mm or more, which means the maximum expansive pressure generated at this diameter is sufficient to break up the concrete. It is also found that the static crushing process can be divided into three phases, the crack-free phase(p<2.58 MPa), the crack initiation and expansion phase(2.58 MPa≤p<11.28 MPa) and the crack-through phase(p≥11.28 MPa).