不同水压下混凝土断裂能弱化效应试验研究  

Experimental Study on Fracture Energy of Concrete Under Different Hydraulic Pressure

作　　者：胡少伟[1] 王洋 孙岳阳 陆俊[1] HU Shao-wei;WANG Yang;SUN Yue-yang;LU Jun(Nanjing Hydraulic Research Institute,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing 210098,China)

机构地区：[1]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《混凝土与水泥制品》2020年第12期6-10,共5页China Concrete and Cement Products

基　　金：国家重点研发计划项目(2016YFC0401902);国家自然科学基金项目(51679150、51739008);国家重大科研仪器研制项目(51527811)。

摘　　要：为了研究混凝土在水力劈裂过程中的断裂能变化规律,分析了水力劈裂中的各荷载做功,建立了水压力下断裂能的计算公式,开展了12组混凝土水力劈裂试验,得出了水压力对混凝土断裂能的影响规律。结果表明:水压力作用下混凝土的断裂能减小,水压力越大,混凝土的断裂能越小;混凝土在水力劈裂过程中的断裂能弱化效应不可忽略,在0.3 MPa水压力下,该弱化效应随水压力增加呈线性递增趋势。In order to study the influence of water pressure on fracture energy of concrete under hydraulic fracturing,the work done by each load in hydraulic fracturing test was analyzed,the calculation formula of fracture energy under water pressure was established,and 12 groups of hydraulic fracturing tests of concrete were carried out.The results show that the fracture energy of concrete decreases under the action of water pressure,and the greater the water pressure,the smaller the fracture energy of concrete,which shows that the weakening effect of the fracture energy in the process of concrete hydraulic fracturing cannot be ignored,the weakening effect increases linearly with the increase of water pressure which not exceed 0.3 MPa.

关 键 词：混凝土 断裂能 水力劈裂 水压力 三点弯曲梁 

分 类 号：TU528.36[建筑科学—建筑技术科学]