点荷载强度试验在水电工程中的应用

Application of Point Loading Strength Test in Hydropower Engineering

点荷载强度试验是岩石强度分类的一种指标试验,可用来预估单轴抗压强度等岩石强度参数,并服务于岩体风化分类和围岩的分级。点荷载强度试验适用于各类规则或不规则的岩石,特别适合于破碎、强度低及易风化岩样的强度试验,试验设备轻便,操作简单快捷。作者在国外某水电工程实例中,严格按照相关试验规程进行了各种岩性在多种风化程度下大数量的点荷载强度试验数据累积,本文将点荷载强度试验数据推算的单轴抗压强度与取岩芯样在试验室进行的各状态下单轴抗压强度试验数据进行比对,偏差均不大,故认为在水电工程初期的勘察设计中,简单、经济的点荷载强度试验是一种非常实用且有效的岩石试验手段。

Point loading strength test(hereafter named PLST)is an index test for rock strength classification,which can be used to estimate rock strength parameters such as uniaxial compressive strength and serve for rock weathering classification and classification of surrounding rocks.PLST is suitable for all kinds of regular or irregular rocks,especially for the strength test of crushed,low strength and easily weathered rock samples.The test equipment is portable and the operation is simple and fast.In a foreign hydropower engineering example,the author accumulates a large number of PLST data for various lithologies under various weathering degrees in strict accordance with relevant test regulations.In this paper,the uniaxial compressive strength calculated from the PLST data is compared with the uniaxial compressive strength test data obtained from core samples under various conditions in the laboratory,with little deviation.Therefore,it is considered that the simple and economical PLST is a very practical and effective rock test method in the initial investigation and design of hydropower engineering.