摘要
喀斯特地貌是具有溶蚀力的水对可溶性岩石(大多为石灰岩)进行溶蚀作用等所形成的地表和地下形态的总称,又称岩溶地貌。在喀斯特地貌上修建建筑物,常会遇到不同的溶洞,其中串珠状溶洞相对于其他形式的溶洞更加危险和复杂。由于施工期间无法在短时间内探明围岩发育情况,现有溶洞极有可能出现二次发育,对工程产生较大的危害。方案通过对串珠溶洞进行双液注浆预处理技术,可有效填充串珠溶洞,注浆孔合理的布置可达到大范围填充的目的,以满足工程桩施工期间的安全性和永久沉降的满足使用要求。方案显著消除了冲孔灌注桩施工期间的塌孔危机人身安全的风险,加快了施工进度,具有明显的优越性,可为同类型串珠溶洞的预处理和施工提供参考。
Karst is a general term for the surface and subsurface formations formed by the dissolution of soluble rocks(mostly limestone)by water with the ability to dissolve them,also known as karst landforms.Buildings built in karst often encounter different types of caverns,of which beaded caverns are more dangerous and complex than other types.Because the development of surrounding rock can not be found in a short time during construction,the existing karst cave is likely to develop again,which will do great harm to the project.The scheme can effectively fill the string beads solution cave by using the double-liquid grouting pretreatment technology,and the reasonable arrangement of the grouting holes can achieve the goal of large-scale filling,in order to meet the safety and permanent settlement during the construction of engineering piles to meet the use requirements.The scheme has obvious advantages,such as eliminating the risk of collapse during the construction of punched cast-in-place pile,speeding up the construction progress,and providing reference for the pretreatment and construction of the same type of string beads solution cave.
作者
谢志杰
Xie Zhijie(Guangdong Yuantian Engineering Co.,Ltd.Guangzhou 511340,China)
出处
《广东土木与建筑》
2020年第7期95-97,共3页
Guangdong Architecture Civil Engineering
关键词
双液注浆
注浆孔布置
串珠溶洞
实施效果
double-liquid grouting
grouting hole layout
string bead solution cave
implementation effect
