掺膨胀剂的水泥土无侧限抗压强度试验研究

为探究掺膨胀剂水泥浆液在土体加固方面的实用性和效果,在已研究掺膨胀剂水泥浆液基本性能的基础上,进一步展开掺膨胀剂水泥浆对土体加固后形成的水泥土无侧限抗压强度试验研究,研究了膨胀剂在影响土体性能的诸多因素中所占比重,优选出土体加固的最佳方案,为工程实践提供了可靠的理论依据。     

不同纤维长度加筋土无侧限抗压强度分析

为了研究纤维加筋土体在不同纤维长度时的无侧限抗压强度变化规律,通过加入不同长度的聚丙烯纤维,对不同土体进行无侧限抗压强度试验,得到三种不同土体的无侧限抗压强度值,并与各自素土的无侧限抗压强度进行比较,得到的结果为相关地区的工程实践提供了参考依据。     

改良土无侧限抗压强度试件的制作方法对比

对改良土无侧限抗压强度试验的过程进行了介绍,着重对比了采用静压法、锤击法制件的无侧限抗压强度,不同尺寸试件的无侧限抗压强度。结果表明:采用锤击法制件得到的无侧限抗压强度平均值、偏差系数均大于采用静压法制件得到的无侧限抗压强度平均值、偏差系数。对于同一种土样,长柱试件无侧限抗压强度值与短柱无侧限抗压强度值有很好的线性相关性。     

水泥土强度及其微观结构的试验性研究

通过室内试验比较不同水灰比、不同龄期下水泥土无侧限强度的变化规律，从而探究电阻率结构参数法反映水泥土宏观强度的可行性，揭示出水泥土试块强度的形成机理及其抗压破坏过程的微观结构变化规律。     

不同种类纤维土无侧限抗压强度影响因素分析

为研究纤维种类对纤维加筋土无侧限抗压强度的影响规律,选用玻璃纤维土、碳纤维土、聚丙烯纤维土为研究对象,通过正交试验,得到了纤维种类、纤维长度以及纤维掺量三个因素对纤维加筋土无侧限抗压强度的影响规律。     

基于正交试验的木质纤维土无侧限抗压强度分析

通过正交试验,分析了压实度、含水率以及纤维掺量三个因素对木质纤维加筋土无侧限抗压强度试验的影响,试验结果表明:含水率以及压实度对木质纤维土的抗剪强度指标影响非常显著,纤维掺量对无侧限抗压强度的影响有一定的显著性,木质纤维无侧限抗压强度随压实度的增长不断上升,随含水量以及纤维掺量的增大而减小。     

水泥土无侧限抗压强度的试验研究

分析了土的塑性、水泥和外加剂掺量对水泥无侧限抗压强度的影响。试验结果表明,水泥土无侧限抗压强度随土的塑限增大而先减小后增大,随着水泥掺量的增加,水泥土无侧限抗压强度有明显增长,掺了减水剂的水泥土的7 d强度有所增加,但以后强度几乎没有增长。     

A new testing method for indirect determination of the unconfined compressive strength of rocks

A new testing method for the indirect determination of unconfined compressive strength (UCS) of rock core samples is presented. As known, there exist several methods for indirect estimation of UCS, such as point load index (I_s), Schmidt hammer, sonic velocity, block punch strength test, etc. Although the point load index testing method is widely used to estimate UCS, there are many problems and limitations related to this method as reported in the recent literature. The “core strangle test” (CST) proposed in this paper overcomes some of these deficiencies and limitations. The principle of this test depends on the “strangle” type of loading a core along a circle perpendicular to the core axis. In the first stage of this study, blocks of different types of rocks having the strength in a range from weak to strong were collected and cored for UCS, point load index and CST tests. These tests were then conducted and relationships between UCS with I_s(50) and CST were empirically explained and discussed.     

基于水灰比准则的水泥土无侧限抗压强度预测

现行规范对于水泥加固土无侧限抗压强度预测方法不明确,通过引用D.Abrams提出的混凝土水灰比理论,修正了水泥固化高含水率疏浚泥无侧限抗压强度预测方法,为减少室内试验量和缩短工期提供了依据。     

水泥土无侧限抗压强度和电阻率的试验研究

以两种类型的水泥（普通硅酸盐水泥和矿渣硅酸盐水泥）搅拌形成的水泥土试块为研究对象,通过室内试验定量分析了其无侧限抗压强度、电阻率、龄期之间的相互关系,试验结果表明：这两种水泥土试块的无侧限抗压强度和电阻率均随着龄期对数的增加成线性函数增大,无侧限抗压强度与其电阻率成线性增长关系。     

水泥土无侧限抗压强度室内试验研究

通过对水泥土室内配方试验结果的归纳与分析,研究了水泥土无侧限抗压强度与土的水泥掺量、龄期和含水率等影响因素的关系。试验结果表明,水泥搅拌桩能有效提高土体无侧向抗压强度,为今后水泥土搅拌桩的设计和施工提供了参考依据。     

Estimating the unconfined compressive strength of intact rocks from Equotip hardness

In order to utilize the Equotip hardness tester, originally developed in the field of metallic engineering, as an indirect method to predict the unconfined compressive strength (UCS) of rock, laboratory tests were undertaken to establish the UCS, Equotip hardness (L-value) and porosity of nine rock types. Using existing data from Verwaal and Mulder (Int J Rock Mech Min Sci Geomech Abstr 30:659–662, 1993) and the results of laboratory tests, an equation relating UCS (MPa) and L-value obtained from single impacts (L _s) and porosity (n %) was derived, which provides a close approximation of the UCS value. An equation to relate UCS and Equotip hardness is also presented, although this is less accurate. It is considered Equotip testing has advantages over the commonly used Schmidt hammer test.      

原状土的无侧限抗压强度试验研究

针对连云港地区滨海相软土的工程特性，通过大量的试验，分析了原状土的无侧限抗压强度的主要影响因素，以确保提高无侧限抗压强度试验的精度。     

Fuzzy model for the prediction of unconfined compressive strength of rock samples

A data driven approach to the modeling of unconfined compressive strength of rock samples is presented. Fuzzy logic approach is used to represent a nonlinear relationship as a smooth concatenation of local linear submodels. The partitioning of the input space into fuzzy regions, represented by the individual rules, is obtained through fuzzy clustering. The numerical results are compared with a conventional statistical (multi-linear) model. It is shown that the fuzzy model is not only more accurate but as opposed to other black-box approaches (such as neural networks), it also provides some insight into the nonlinear relationship represented by the model.     

用三轴仪测定桩体灰土的无侧限抗压强度

介绍了利用三轴仪测定灰土桩体原状灰土样无侧限抗压强度的实验条件 ,结合具体工程测试实例 ,指出该测试方法操作简便 ,计算简单 ,可以满足工程实际要求     

冻结钙质黏土无侧限抗压强度影响因素研究

对典型的钙质黏土进行人工冻土单轴抗压强度试验,分析了强度曲线的特征,得到了冻结钙质黏土抗压强度随冻结温度、应变速率的变化规律,及在不同养护时间、尺寸效应的影响规律,其结论对冻结法施工、冻结壁设计具有应用价值。     

麦秸秆的物理力学性能及加筋盐渍土的抗压强度

为研究滨海盐渍土的工程处理新方法,开展了防腐前后的麦秸秆吸水率、抗拉性能和加筋土的无侧限抗压强度试验。在SH胶中浸泡后的麦秸秆吸水率较天然麦秸秆明显降低,SH胶增强了麦秸秆的防腐能力;浸胶干燥后麦秸秆与天然麦秸秆相比、浸胶干燥后再浸水麦秸秆与天然浸水麦秸秆相比,前者的极限拉力和极限延伸率都高于后者,浸胶使麦秸秆的抗拉性能提高。考虑掺加不同加筋长度、不同加筋率、浸胶后呈干燥和湿润状态、不同形状的麦秸秆,测试了加筋滨海盐渍土的无侧限抗压强度。试验证实,石灰+麦秸秆加筋滨海盐渍土的抗压强度较石灰土有较大提高;加筋率0.25%和加筋长度10mm时的麦秸秆加筋土(试样直径50mm)的抗压强度最大;浸胶后呈湿润状态麦秸秆加筋土的抗压强度均高于浸胶后呈干燥状态麦秸秆加筋土的;掺加四等分的片状麦秸秆能更有效地增强加筋土的抗压强度。麦秸秆加筋不仅提高了土体的整体性和抗压强度,还限制了土体的横向变形。     

不同纤维掺量加筋土无侧限抗压强度分析

选用聚丙烯纤维为加筋材料,分别对红粘土、粉质粘土和砂土3种土体进行加筋,通过对不同纤维掺量的加筋土进行无侧限抗压强度试验,得到3种加筋土的无侧限抗压强度,并与各自素土的无侧限抗压强度进行比较,得到了一些有意义的结论。     

水泥剂量及级配对水稳碎石抗压强度的影响

通过试验,研究了不同水泥掺量的水泥稳定碎石的无侧限抗压强度,分析了不同水泥掺量对水泥稳定碎石基层力学性质的影响规律,为沥青路面反射裂缝成因分析及防治技术研究提供参考依据。