Chinese karst geology and measures to prevent geohazards during shield tunnelling in karst region with caves
Chinese karst geology and measures to prevent geohazards during shield tunnelling in karst region with caves
复制标题
中国岩溶地质及溶洞盾构施工地质灾害防治措施
DOI：
10.1007/s11069-014-1585-6
复制
发表时间：
2015-05-01
期刊：
影响因子：
3.7
通讯作者：
Ye, Guan-Lin
中科院分区：
文献类型：
--
作者：
Cui, Qing-Long;Wu, Huai-Na;Ye, Guan-Lin
岩溶景观在我国分布广泛，广东省埋藏岩溶分布广泛。本研究主要集中在埋藏的岩溶或溶洞，这些岩溶或溶洞位于地下50米深处，对工程建设活动有重大影响。广东省岩溶洞穴分布广泛，具有裂隙水含量高、岩石渗透性强、易塌陷、形态多变、分布不规则等特点。盾构隧道在这种环境下施工时，可能会出现诸如沉陷、进水或进石以及对已建隧道的损坏等危害。因此，隧道施工前需对溶洞进行处理。介绍了岩溶地区盾构隧道施工过程中溶洞的处理方法。施工程序包括现场调查、判断、处理和效果检查。详细介绍了溶洞处理的处理标准、灌浆材料、施工步骤及效果检验。在广州岩溶地区进行了溶洞处理盾构法隧道施工现场试验。现场调查包括灌浆材料钻孔样品的无侧限抗压强度（UCS）测试、标准贯入试验（SPT）、岩芯回收率（CR）、地表沉降和建筑物沉降。钻孔样品的抗压强度均大于0.2MPa，标准贯入强度均大于10，压缩比均大于90%。地表沉降和建筑物沉降实测值均在允许范围内。试验结果表明，该处理工艺在岩溶地区具有较好的适用性。
Karst landscapes are widely distributed in China, and buried karst is widespread in Guangdong. This study mainly focuses on buried karst or karst caves which are underground at depths of up to 50 m and can significantly affect engineering construction activity. The karst caves, which are widely distributed in Guangdong Province, have the following features: high fissure water content, high rock permeability, prone to collapse, variable shapes, and irregular distribution. When a shield tunnel is constructed in this kind of environment, hazards, such as sink holes, the ingress of water or stones, and damage to the constructed tunnels may occur. Thus, karst caves need to be treated before tunnel construction. This paper presents a procedure for karst cave treatment to mitigate possible hazards during shield tunnelling in karst regions. The construction procedure includes field investigation, judgment, treatment, and effectiveness check. The treatment criteria, grouting material, construction steps, and effectiveness check for the karst cave treatment are introduced in detail. A field test on shield tunnelling excavation was conducted using the karst cave treatment in the karst region of Guangzhou, China. Field investigations include testing the unconfined compressive strength (UCS) of borehole samples of grouting materials, standard penetration test (SPT), core recovery (CR), ground surface settlement and building settlement. All of the UCS values of the borehole samples are greater than 0.2 MPa, the modified SPT values are more than ten, and the CR values are greater than 90 %. The measured values of ground surface settlement and building settlement are all within the allowable ranges. All of the test results demonstrate the applicability of this treatment process in karst regions.