镇江市蛋山大型堆山工程地质问题分析

镇江市蛋山大型堆山工程地基由强风化三叠系泥质灰岩和燕山期闪长玢岩及粉质粘土、软土等岩土层组成,其地基岩土层力学性质相差较大。本文对该堆山工程填土的力学性质和人工山体的稳定性进行了研究,结果表明,填土的最佳含水率和最优干密度分别为18.2%和1.68g/cm3,其强度比原状土低,具有中等压缩性。采用分段进行堆土施工可以较好解决地基不均匀沉降问题。以土层为地基的西侧和南侧其山体边坡稳定性较差,在特殊不利工况下接近临界状态。这一研究对矿山生态环境治理、城市废弃物处理和堆山景观工程均具有示范作用。

Study on the Engineering Geological Problems of the Danshan Large Scale Piling Mountain in Zhenjiang City

The foundation of the Danshan large scale piling mountain is mainly composed of the argillaceous limestone,strongly weathered diorite and soft soil in Zhenjiang of Jiangsu Province.The composition of the filling soil is consistent with the clay,which the maximum dry density and the optimal moisture content are calculated to be 1.68g/cm3 and 18.2% respectively.The strength of filling soil is lower than the undisturbed soil after the filling soil is rolled and compacted with moderate compression.If the method of stage construction could be used,the differential settlement of the artificial mountain be greatly reduced.By the analysis of the physical and mechanical properties of the filling soil and the stability of the artificial mountain,the stability of the west and the south slope of the artificial mountain are worse than the east and the north.The stability results by numerical simulation and the limit equilibrium method are very good consistency.