水土化学体系中钙镁对土体结构强度贡献的试验研究

城市区域的土体环境一般是处在常态即常温、常压、缓变异的水化学环境中,在这种环境中,影响土体稳定的要素-土体中的化学组份扮演着重要的角色,而其对诸如地面沉降、土洞的产生都有重要影响。土体稳定受其结构强度控制,钙镁是土体结构构成中重要组成部分,理论与实践分析表明,在常态水环境下,其对结构往往起着控制作用,在常态水环境中,土结构的破裂面并不是通过颗粒本身,而是通过颗粒、颗粒集合体与集合体之间粒间连结。设计的常态水环境下的化学组份变异与CO2分压增高水环境下的室内模拟试验,揭示了化学组份钙镁对土体结构的贡献与对宏观强度的作用。

EXPERIMENTAL RESEARCH ON Ca2+ AND Mg2+ CONTRIBUTIONS TO STRUCTURAL STRENGTH IN SOIL BODY -HYDROCHEMISTRY ENVIRONMENT

Urban soil bodies generally exist in the hydrochemistry environment of normal temperature, atmospheric pressure and slow variation. Under this kind of conditions, the chemical components in soil, which are an essential factor affecting the stability of soil, play an important role in this kind of environment, and also have an important influence on surface subsidence, production of earth holes and so on. The stability of soil body is controlled by its structural strength, and calcium or magnesium are important constituents of soil. It is indicated that calcium and magnesium always control the quality of structure in normal water environment according to the theory and practice, and in the same situation, the fracture plane of soil is not connected through pellet itself, but through the intergranular links among pellets, pellets and pellet aggregates. It promulgates the contribution to soil structure and the function to its macroscopic intensity of chemical components such as calcium and magnesium through simulation test including chemical component variation and enhancement of partial pressure of COz under normal water environment.