破碎中风化砂岩承载力试验及应用  

Test and Application of Bearing Capacity of Broken Weathered Sandstone

作　　者：刘恒生 LIU Hengsheng(Shenzhen Xinyi Holding Group Co.,Ltd.Shenzhen 518000,China)

机构地区：[1]深圳市信义控股集团有限公司,深圳518000

出　　处：《广东土木与建筑》2025年第3期65-67,75,共4页Guangdong Architecture Civil Engineering

摘　　要：破碎岩体一般无法完整取样进行室内试验获得岩体饱和单轴抗压强度,无法根据规范公式得到承载力。为获得较准确承载力,通过野外鉴定、载荷试验、规范建议值及多种方法分析、计算综合评价破碎岩承载力,其承载力可以大幅提高且达到或超过了规范最高值。分析载荷试验结果表明,试验时地下水位在试验坑底面以下,实际基坑回填地下水位回升后岩体处于饱和状态,载荷试验所得承载力及变形模量偏大;桩孔爆破施工对底部破碎岩体的扰动,对承载力及地基变形有一定影响,范围约为1.5m。结果与项目原承载力对基础进行经济比较,节约基础成本约1500万元。The broken rock mass generally cannot be completely sampled for laboratory tests to obtain the saturated uniaxial compressive strength of the rock mass,and the bearing capacity cannot be obtained according to the standard formula.In order to obtain more accurate bearing capacity,through field identification,load test,specification recommended value and various methods of analysis and calculation,the bearing capacity of broken rock is comprehensively evaluated,and its bearing capacity can be greatly improved and reached or exceeded the maximum value of the specification.The results of the load test show that the groundwater level is below the bottom of the test pit during the test,and the rock mass is in a saturated state after the actual foundation pit backfills the groundwater level,and the bearing capacity and deformation modulus obtained by the load test are too large.The disturbance of pile hole blasting construction to the broken rock mass at the bottom has a certain influence on the bearing capacity and foundation deformation,and the range is about 1.5 meters.According to the results and the original bearing capacity of the project,the foundation is economically compared,and the foundation cost is saved by about 15 million.

关 键 词：破碎中风化砂岩 载荷试验 承载力 Q-S曲线 沉降量 

分 类 号：TU47[建筑科学—结构工程]