CAJ | 학술논문

常规的抗剪强度指标黏聚力 c 和内摩擦角φ无法准确描述堆载作用下任意固结度时软土的力学特性，而现有的考虑软土抗剪强度值随固结度增长的极限平衡法无法得出应力场、位移场等实际工程需要的数据，因此，基于理论推导和室内试验，对堆载作用下软土抗剪强度指标随固结度的变化规律进行了分析。对现有的2个计算公式进行了对比分析，得出它们具有等价性。从孔隙水压力的角度进行分析，提出了新的计算公式，并且得出内摩擦角随固结度单调递增，黏聚力随固结度单调递减的变化规律。当固结度一定且不为100%时，黏聚力与初始固结压力呈线性增长的关系，内摩擦角与其无关。室内试验表明，由于综合考虑了有效应力参数和总应力参数，新推导公式与试验结果吻合得更好，证明了新推导公式正确性和优越性。
상규적항전강도지표점취력 c 화내마찰각φ무법준학묘술퇴재작용하임의고결도시연토적역학특성，이현유적고필연토항전강도치수고결도증장적겁한평형법무법득출응력장、위이장등실제공정수요적수거，인차，기우이론추도화실내시험，대퇴재작용하연토항전강도지표수고결도적변화규률진행료분석。대현유적2개계산공식진행료대비분석，득출타문구유등개성。종공극수압력적각도진행분석，제출료신적계산공식，병차득출내마찰각수고결도단조체증，점취력수고결도단조체감적변화규률。당고결도일정차불위100%시，점취력여초시고결압력정선성증장적관계，내마찰각여기무관。실내시험표명，유우종합고필료유효응력삼수화총응력삼수，신추도공식여시험결과문합득경호，증명료신추도공식정학성화우월성。
The analysis of changing rule of shear strength indexes of soft soil with consolidation degree under the effect of surcharge load is executed based on the theoretical derivation and indoor tests; since the conventional shear strength indexes cohesion value and internal friction angle cannot represent the mechanical character of the soft soil at any consolidation degree at the effect of the surcharge load accurately, and the existed limit equilibrium method considering the increasing of the shear strength value with the consolidation degree cannot get the data such as stress field, displacement field that are needed by the practical engineering. The comparison analysis has been done for two existed formulae, and deduced that they have equivalence property. From the viewpoint of pore water pressure, a new formula is presented; and from which we get: the internal friction angle at any consolidation degree increases with the consolidation degree monotonously; and the cohesion value decreases with the consolidation degree monotonously;when the consolidation degree is fixed and is not 100%, the cohesion value presents the linear increasing relationship with the initial consolidation pressure; but the value of the internal friction angle is not related to it. The indoor test shows that, the newly deduced formula results fit better with the test results than the existed formulae results; since the total stress parameters and the effective stress parameters have been considered comprehensively, so as to prove the validity and advantage of the newly deduced formula.