【摘要】：在我國沿海沿江地區(qū),普遍分布著深厚的軟粘土層。當抽取地下水時,這些弱透水性的軟土層與抽水層之間形成水力梯度差,發(fā)生水力聯(lián)系現(xiàn)象,即越流。越流引發(fā)弱透水土層的固結,導致地面沉降。而弱透水土層在形成過程中,往往受沉積力、沉積環(huán)境及土顆粒間膠結作用等的影響,大部分都具有結構性。在固結過程中,考慮結構性與不考慮結構性相比,會有很大的差異。在準確預測抽水引發(fā)的地面沉降中,這種差異性是不能忽略的。為此,本文采用解析法對越流系統(tǒng)中成層結構性弱透水土層一維固結理論及其固結性狀開展了較深入的研究。主要原創(chuàng)性工作如下： 1.基于雙層地基一維固結理論,采用簡化的kv-σ和mv-σ分段模型表征軟土結構性參數(shù)變化,建立了以水頭表示的單層結構性軟土一維固結控制方程。分別推導了承壓含水層水位曲線下降、瞬時和線性下降情況,弱透水土層中水頭、孔隙水壓、沉降及按沉降定義的平均固結度的解析表達式,并驗證了當不考慮結構性時的本文解析解與已有解析解的一致性。結合不同算例,分析了結構性及結構性的強弱對固結性狀的影響。 2.分別推導了潛水層和承壓水層水位下降引發(fā)的雙層結構性軟土層一維固結解析解。通過計算,闡明了水位下降與荷載作用下引發(fā)結構性軟土固結之間關系的實質,并分析了結構性及結構性的強弱對固結性狀的影響,進一步對比了上下土層結構屈服應力值的相對大小對固結度和沉降的影響。 3.推導了承壓水層水位下降引發(fā)的成層結構性弱透水土層一維固結解析解。分析了結構性及結構性的強弱對水頭、孔隙水壓、沉降及沉降發(fā)展速率的影響,并探討了夾層土結構屈服應力的不同對固結度和沉降的影響。
[Abstract]:In the coastal areas along the Yangtze River, deep soft clay layers are widely distributed in China. When the groundwater is extracted, the hydraulic gradient difference is formed between the weak permeable soft soil layer and the pumping layer, and the phenomenon of hydraulic connection occurs, that is, the overflowing. The overflows lead to the consolidation of the weak permeable soil, which results in the settlement of the land. In the process of formation, the weak permeable soil layer is often affected by sedimentary force, sedimentary environment and cementation between soil particles, most of which are structural. In the process of consolidation, there is a great difference between considering the structure and not considering the structure. This difference can not be ignored in accurately predicting the land subsidence caused by pumping water. Therefore, in this paper, the one-dimensional consolidation theory and its consolidation behavior of stratified structural weak permeable soil layer in the cross flow system are studied by analytical method. The main original works are as follows: 1. Based on the one-dimensional consolidation theory of double-layer foundation, the simplified kv- 蟽 and mv- 蟽 piecewise models are used to characterize the structural parameters of soft soil, and the one-dimensional consolidation control equation of single-layer structural soft soil is established in terms of water head. The analytical expressions of water level curve, instantaneous and linear decline, water head, pore water pressure, settlement and average degree of consolidation defined by settlement in weak permeable soil are derived, respectively. The consistency between the analytic solution and the existing analytic solution is verified when the structure is not considered. Combined with different examples, the influence of structural and structural strength on consolidation characteristics was analyzed. 2. The one-dimensional consolidation analytical solution of double-layered soft soil caused by the drop of water level in submersible layer and confined water layer is derived respectively. In this paper, the essence of the relationship between the fall of water level and the consolidation of structural soft soil caused by load is clarified, and the influence of structural and structural strength on consolidation behavior is analyzed. The effects of yield stress on consolidation and settlement of upper and lower soil layers are further compared. 3. In this paper, the analytical solution of one dimensional consolidation of layered structural weak permeable soil caused by water level drop in confined water layer is derived. The influence of structural and structural strength on water head, pore water pressure, settlement and settlement development rate is analyzed, and the influence of different yield stress of intercalated soil structure on consolidation degree and settlement is discussed.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU43

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