摘要
深圳岩溶地区的地质情况复杂,且普遍为岩溶强发育。文章针对深圳岩溶地区常见溶(土)洞分布情况,参考以往工程经验,结合实际案例,总结了相应的溶(土)洞处理措施。其中,浅层溶(土)洞,可采用碎石或注浆进行置换回填;桩身溶(土)洞,对于探明的溶(土)洞,当洞深在2.5 m以下时,可采取回填片石、粘土并配合冲孔机小冲程冲打措施处理;当洞深大于2.5 m时,可采取灌注水泥浆或填充C20混凝土进行处理;对于未探明的溶(土)洞,以确保成孔为原则,或反复投入黏土加水泥,快速回填C20混凝土或速凝混凝土;对于能成孔的桩身溶(土)洞,建议在成桩过程中利用桩身混凝土填充;桩端持力层下方溶(土)洞可采用高压喷射洗孔后注浆填充方法进行处理。文章总结的溶(土)洞处理措施对于提升岩溶地区内的地基基础工程施工质量具有重要参考价值。
The geological conditions in the karst area of Shenzhen are complex and generally strongly developed.According to the com‐mon distribution of karst rock(soil)caves in Shenzhen karst area,combined with previous engineering experience and practical cases,the corresponding treatment measures of karst rock(soil)caves are put forward,which has important reference value for improving the construc‐tion quality of foundation engineering in karst area.The shallow karst(soil)hole can be replaced and backfilled by gravel or grout;For dis‐covered pile body karst(soil)hole,the depth of which is below 2.5 m can replaced and backfilled by rocks,clay with the help of the punching machine;the depth of which is greater than 2.5 m can be treated by pouring cement or C20 concrete.For undiscovered karst(soil)holes,in order to ensure the formation of the pile hole,clay and cement or C20 concrete or quick-setting concrete should be quickly backfilled in succession;If the pile hole can be formed,it is recommended to use the pile body concrete to fill the karst(soil)holes in the pile forming process;the karst(soil)hole under the pile end can be treated by grout filling after high pressure hole washing.
作者
张明
顾兴海
刘启安
范金锋
曾志强
ZHANG Ming;GU Xinghai;LIU Qi'an;FAN Jinfeng;ZENG Zhiqiang(Bureau of Public Works of Shenzhen Municipality Shenzhen 518000,China;Shenzhen Municipal Engineering Corp.,Shenzhen 518000,China;Shanghai Project Management Co.,Ltd.Shanghai 200072,China)
出处
《广东土木与建筑》
2023年第8期28-31,共4页
Guangdong Architecture Civil Engineering
关键词
深圳
岩溶地区
建筑工程
地基基础
桩基础
溶洞处理
土洞处理
Shenzhen
karst area
building project
foundation
pile foundation
karst cave treatment
the treatment of soil cave
