综合勘探法在假山工程加固中的应用

Application of comprehensive exploration method in the reinforcement of rockery engineering

钻探和物探是目前探明地层结构及内部异常的常用手段,平原地区城市公园中假山的地质条件较为脆弱,一般采用堆砌黏性土作为山体,外部采用叠石护坡,且上覆较多构筑物,不宜在山体区域开展钻探,需采用踏勘及高密度电法相结合的综合勘探法进一步查明。结合工程实例,经过踏勘及物探手段发现:山体不规则、叠石分布不合理、人工水系的密布及山脚孔洞的开挖,导致土堆砌遭到冲刷及不均匀沉降,裂隙及空洞出现。进而造成山体裂缝、岩体外倾、挡土墙位移及构筑物基底悬空等风险隐患。根据风险隐患特点及成因,提出了相应的加固措施,为今后假山加固设计及施工提供建议,从高密度电法视电阻率断面可以看出,山体外侧及人工水系分布处是视电阻率低密度区集中区域,应重点加固。

Drilling and geophysical prospecting are common means to find out the formation structure and internal anomalies.Because the rockery in the urban park in the plain area is generally stacked with cohesive soil as the mountain,the external slope protection is adopted by stone laying,and there are many structures in the upper part of the rockery,the geological conditions of the rockery are relatively fragile,and it is not suitable to carry out drilling in the mountain area.It is necessary to use the comprehensive exploration method combining reconnaissance and high density electrical method to further identify.In this paper,based on engineering examples,it is found that the irregular mountain,the unreasonable distribution of stone laying,the dense artificial water system and the excavation of holes at the foot of the mountain lead to erosion and uneven settlement of the soil pile,and cracks and voids appear.It will cause some risks,such as mountain cracks,rock mass outward tilt,retaining wall displacement and structure basement hanging.According to the characteristics and causes of hidden risks,the corresponding reinforcement measures are put forward to provide suggestions for the future rockery reinforcement design and construction.From the high density electrical apparent resistivity section,it can be seen that the lateral side of the mountain and the artificial water distribution are concentrated areas of low apparent resistivity,and should be strengthened.