摘要
岩溶地区地质复杂,详勘阶段难以完全查清溶洞分布,且此类区域往往夹砂夹泥,涌水量大,天然地基开挖时,持力层以上的不良土层难以清理干净,导致基础底板下存在沉渣和溶洞的情况。注浆是岩溶地区处理溶洞的最常用的方法,但是由于岩溶地区裂隙非常发育,注浆结果难以准确控制,可能不能将溶洞及裂隙完全充填,沉渣也不能完全清理干净,加入钢管桩承担部分竖向荷载,加固注浆体,可以弥补注浆的缺点。以广西某高层住宅项目为例,说明这一技术在实际工程中的应用。该项目建筑物已封顶,经监测,未发生不均匀沉降,地下室墙面裂缝未继续发展,起到了较好的处理效果。
Even during the final design stage,the complete distribution of the karst cavities under the proposed site is not possible.Usually,the rock pinnacles are well developed in these areas and a large amount of saturated loose sand with mud and abundant groundwater are existed in soil and rock interface.During the foundation excavation for the shallow foundation on natural soils,the poor and saturated soils are very difficult to be removed and the potential safety hazards are existed due to the underlying karstic cavities.The grouting method is a conventional ground improvement method for the karst soil treatment.However,due to the well-developed rock fissures,the result of the grouting is very difficult to predict,and the rock fissures cannot be completely filled.Therefore,the pipe piles can be applied to carry portion of vertical loads.This paper presents a high-raised residential building ground improvement case history of applying the grouting method and the pipe piles.The monitoring results indicate that no differential settlement was occurred and the cracks on the basement wall had no further development.
作者
王俊淞
WANG Junsong(Shenzhen Sinoroot Construction Co.,Ltd.,Shenzhen 518129)
出处
《土工基础》
2019年第3期246-249,共4页
Soil Engineering and Foundation
关键词
注浆
钢管桩
溶洞
地基处理
Grouting
Steel Pipe Piles
Karst Cavities
Ground Improvement
